RP174V. 3 July 2003 Foreword

I. Task Description

Napo Township, Tianyang COunry, Public Disclosure Authorized Naji Navigation Complex is placed by Naji Village, which is about 38km downstream of Baise City. The Complex is multi-purposely built for water resources utilization, majoring in navigation, giving attention to power generation, irrigation and other aspects. It will also act as a counter-regulation reservoir for Baise Hydraulic Complex. It is on the fourth step to be built in the Overall Planning of Yujiang River. The normal water storage level of the reservoir is 115m, backwatered to the lower approaching channel of Baise Hydraulic Complex, which is in the upstream. The total length of the reservoir is about 56km, and the total capacity is 103 million m3 . The reservoir area compromises Youjiang District of Baise City and Tianyang County, the geographic coordinate is round east longitude 23°44' - 23°53', north latitude 106032' - 106 47', as detailed in the Location Map (Drawing 1).

Up till now, the engineering geological investigation and geological hazard evaluation for completed. Whenever taken into account Public Disclosure Authorized the preliminary design of the Project has been that there are rich mineral resources in the reservoir area and the areas along the banks of the reservoir, in purposes of guaranteeing the safety in the mining production on both banks of the reservoir area as well as the normal operation of the reservoir after the completion of the Project, Nanning Non-ferrous Metal Foundation Work Survey Institute has undertaken the investigation and study on the relationship between the coal mines and the reservoir, as entrusted by Guangxi Xijiang Waterway Construction and Development Co. Ltd., and as required by the World Bank in its faxed dated June 11 and June 18 of 2003 as well as the Third Meeting of the Dam Safety Panel held on May 25 of 2003.

In accordance with the Investigation and Research Program, the aims and tasks of the task include the following: Public Disclosure Authorized

a. To investigate and find out the distribution of mineral resources and the distribution of production activities in the reservoir area and the areas around the banks, to find Out the relationship and the functions among the state-owned coal mines, the township coal mines, the individual coal mines and the illegal coal mines;

b. To confirm the distance between the reservoir and the safety operation of the coal mining activities, to check for the potential coal mine resources in the reservoir area;

c. To investigate and find out the characteristics of the stratum lithology and the faulted structure in the reservoir area and the area around the banks, the characteristics of hydrogeology and the engineering geology in the coal mine areas, as well as the relationship between the safety in reservoir operation and the safety in coal mine production; Public Disclosure Authorized

d. To investigate and find out the influence extent of the coal mining in the reservoir and the areas around the banks to the safety in reservoir operation, as well as the influence extent of the reservoir to the mining activities, so as to forecast the potential geological hazards such as the inundation and immersion as well as the leakage of the reservoir; I CFnLF NWP'Y e. To investigate the influence of the amplitude of the water in the river for the past years on the exploited mines, for instance, the history of coal mine flooding because of the swelling of the river;

f. To give a comprehensive evaluation on the above-said influence factor for the potential reservoir water storage and the coal mining, as well as the potential geological hazards, and to propose a scientific and reasonable solution and measures.

The Special Report on the Relationship between Coal Mines and the Reservoir for Naji Navigation Complex, including the main text and the attached drawing, is provided at the last, so as to offer an external and true evaluation for the Client and related departments.

II. Process of the Task

The task commenced on June 20, 2003. On the basis of related information collection on the reservoir area and the peripheral foundation geology, mineral geology, hydrogeology and engineering geology, the field investigation starts on June 26, 2003, and finished on July 1. The indoor clear up, the compilation of the report and the attached drawings are preliminarily finished by the first half of July. The Special Report on the Relationship between Coal Mines and the Reservoir, including the main text and the attached drawings, was provided to the Client on July 11.

The main quantities of the task are detailed in Table 1-1.

Main Quantities of the Task

Table 1-1 Task Quantity Scale Geological Investigation for the Minerals along the Banks 60km' 1: 10000 of the Reservoir (field sketching) Worked-out Area Investigation along the Banks of the 40km 1: 10000 Reservoir (field sketching) Hydrogeological Investigation along the Banks of the 100km 1: 10000 Reservoir (field sketching) _ Engineering Geological Investigation along the Banks of the 60kmi 1: 10000 Reservoir (field sketching) I

In addition, we would like to extent our sincere thanks to the officers and experts from the Fourth Survey Branch of Guangxi Geological Investigation Institute, the Information Center of Guangxi Land Resources Department, the Administration Bureau for Small Coal Mines of Guangxi, Baise Land Resources Bureau, Tianyang Land Resources Bureau and Gonlou Branch of Youjiang Mine Bureau, who have offered assistance and institutions during the information collecting, field investigation and report preparation of the task.

2 Chapter 1 Reservoir Geology, Hydrogeology, Engineering Geology

Section 1 Reservoir Geology

I. Stratum lithology

There are Carboniferous, Permian, Triassic, Eocene, Quaternary stratum in and around the reservoir area. Tertiary and Quaternary strata distribute most principally. Here is description of the lithology.

1. Quaternary (Q)

Quatemary stratum in the reservoir area can be distinguished as Holocene alluvium

(Qa1 4 h) and Pleistocene alluvium. (Qa3p )

a. Pleistocene alluvium (Qal4 h)

It is mainly located along the banks of Youjiang River. The banks are composed by neoteric floodplain (Q 4h2) and the first terrace by the river (Q al4h' ) . Lithology is yellow, lark silt or clay silt, and gray, caesious, yellow, lark sand and scree gravel. The thickness is 0.7-33.1m. b. Pleistocene alluvium. (Qalp)

It is mainly distributed along the banks of Youjiang River. They are composed by the second, third and fourth terrace by the river banks. The terraces are in dualistic structure. The top is brown silt clay in plastic or hard plastic form. The lower is sand and scree gravel. The thickness is 43-84m.

2. Eocene (E)

It is the principal stratum in the reservoir area, which is divided into Pliocene Dongjun Group (E 2d) , Nadu Group (E 2n) , Baigang Group (E 2b) , Oligocene Fuping Group (Elf), and Jiandu Group(Elj). Lithology is mudstone, silt mudstone, soil sandstone, silt sandstone, sandstone, gravel sandstone. Eocene Nadu Group (E 2 n), Baigang Group (E 2b), Oligocene Fuping Group (E3f) are the principal coaly stratum of Baise coalfield. The coaly stratum are 10 - 40, 2 - 7 available. The total thickness is over 600-3000m.

3. Tertiary (T) It distributes around basin periphery, composed by Miocene Lamu group (T21), Baipeng Group (T 2 bf) , Paleocene Luolou Group (T 11) a. Miocene Lamu Group (T21)

3 It is celadon thin or thick calcrete, sand mudstone, quartzite, calcicolous mudstone, calcicolous silt sandstone. The thickness is 8 6 8-1697m. b. Miocene Baipeng (T2b])

It is thin or mid-thick calcrete mudstone, silt quartzite, calcicolous silt sandstone. The thickness is > 1900m.. c. Paleocene Luolou Group (T1 l)

It is gray -dark gray thin or mid-thick calcicolous mudstone, sand mudstone and gray rock. The thickness is 58-277m. d. Permian (P)

It distributes in the east-south reserVoir, where is south of Napo county. The scope is small, including Upper Heshan Goup (P 2h) and Lower biologic Reef (Pbls)

(i) Upper Heshan Goup (P 2 h)

It is lark folium mudstone , dark gray folium argillite, argillite mudstone, ash rock and lapillus. The thickness is> 155m.

(ii) Lower biologic Reef (Pbls)

It is gray and dark gray thick cascade biologic crumbs. The thickness is 15-389m. e. Carboniferous upper (C 2 )

Carboniferous upper is distributed in the east-south reservoir, where is south of Napo county. The scope is small, including Maping Group (C2pm) and Huanglong Group (C2 h)

(i) Maping Group (C 2pm)

It is fleet gray and gray thick cascade lime, biologic crumb lime, flint lime, argil. The thickness is 137-352m.

(ii) Huanglong Group (C 2h)

It is fleet gray and gray thick cascade lime, biologic crumb lime, oolite. The thickness isll12-138m.

II. Geologic Formation

4 a. Regional Geologic Formation

The reservoir locates Xinlin-Baise ruche, which is part of the south-china quasi-mesa Youjiang River renewed geosyncline. The Youjiang River great rupture affects main formation. Part of the rupture, Yongle-Tianyang section, passes from north to west 7-8km from north of the reservoir. The pressing- tensing rupture trend from north-east of north-west with obliquity of 60° -80° and trend of NW310° - 3200 .Some wide crack along the rupture is over 100 m width. The rupture divide the stratum below upper Paleozoic with depth of 10-15km. It is not deep rupture. The period is yinzhi-yanshan in Cenozoic action.

Youjiang River great rupture affect the inclined basin and following formation. Details are in formation program chart 1-1. b. Geologic Formation in Reservoir Area

Reservoir locates in Baise Basin, which is a constructional fault basin, strip tension in orientation 2900 , 50km total length, 7-13kni width, 25km width within reservoir. The basin is overlaid by Quatemary alluvium, which develops from smooth Tertiary drape and deflected 2800 from axe to north basin. North wing terraces are steeper than the south wing. Terraces are steeper than that concomitant of the axe. Parts are formed steep terrace by rupture. Concomitant tension-rupture with Youjiang River Great rupture form a series of tension-rupture group, which are tectonic terrace. There are Baise hollow and Sitang heave in the reservoir area and Tianyang hollow and Nabai heave, which affect the development of sub drape and structure. Faultage in the reservoir area is northwest normal fault and Northeast Strike-slip Fault. See formation Chart in reservoir area 1-2. The characters of the fault are described as following:

(i) F, normal fault

It distribute on the brim of south reservoir. The fault is 280° -300° cross the coalfield, with steep southwest obliquity and 400-800m perpendicular throw. The fault is incised by mass small strike-slip faults to several parts. The two wings of the fault is Eocene Nadu Group (E2 n). The thickness of the two wings is different, less than lOOm in north and more than 600m in south.

(ii) F2 normal fault

It distributes on the south of Fl fault. The fault is 280° -295° northeast trend and 400-800m perpendicular throw . The fault incised the Nadu Group (E2n).

(iii) F3 normal fault

It distributes on the southwest reservoir downstream where the Shuipu coalfield is. It is lOkm length, 2750 -280° trend, 75 0 obliquity, 60m largest distance in west and

5 smaller to east. It divide the Nadu Group (E2n). The west of the fault is near Youjiang River.

(iv) F4 strike-slip fault

It distributes on the reservoir upstream where the Dawan coalfield is. It is 6km length, 20 ° southeast trend. The distant is unknown. The fault is from northwest to north, southeast down. It divides the F1 and F2 normal fault. It cuts the Youjiang River bed in southwest.

(v) F7 strike-slip fault

It distributes on the reservoir downstream where the shuipu coalfield west fault is. It is 6km length, 200 southeast trend. The fault is from northwest to north, southeast down. It's middle part cut the Youjiang River bed.

(vi) Flo strike-slip fault

It distributes on the reservoir downstream where the Shuipu coalfield is. It is 8km length, 150 southeast trend, 90 ° obliquity, and with normal fault character. The fault is down from east to south. The level distance between north part and contour point of coal board is 450m, and SOm in. south. The perpendicular throw is 20-30m. It cuts down the Nadu Group (E2n).

III. The Fault Distribution and Character of Youjiang River Banks

As shown in Table 1-2, There are several normal fault and strike-slip fault, including normal fault F2, F3, F12, F13, F14 and strike-slip fault F6 developed from upstream to downstream on trend northwest, and fault F3, F4, F7, Flo, F8 Fg, Fl1 on trend northeast. The faults are small. Fault F2, F3, F4,Fio are longer than 5km, and are described in above paragraphs. The other faults are 1-3km in length. Their characters are shown in table 1-1.

6 Characters of Fault Near River Bank Tablel-l LeghPerpendicula_ _ No Location Trend Inclination Obliquity Character Length Perp i Notes

F5 Pier diggings Northeast Unknown 3 F8 Southwest Northeast Northwest 750 Normal 3.5 70 shupu coalfield fault F Southwest Northeast Northwest 750 Normal 2.7 70 9 shupu coalfield fault

F1l Gonglou Northeast Northwest 65 0 Normal 2.0 80 coalfield fault Deep c, 50-220 bed in no F12 South shupu 2800 Northeast 750 fault 3.0

I______F8 . F 9. F

F13 South shupu Northwest Southwest 75 0 Normal >2.0 60 ______I______co alfield I _ __ _ I_ __ _ _ I__ __ _ I__fa lI _ __

They are tension and torsion faults. In general, torsion fault is hard for water conducting and tension fault is good for water conducting. But the faults are developed in Tertiary sand inclusion mudstone, where the faults are filled by the soil, so the tension faults are hard for water conducting, which affects the coal exploitation little.

Section 2 Hydrogeology in the Reservoir Area

I. Water Bearing Strata and It's Hydrologic Character

1. Sorts of water bearing strata

Water bearing strata is sorted by rock, composition and aquiclude. The strata is named by principal rock when the rock in the same terrace with different water ratio. According to above principle, there are four aquiclude rock groups and one relative water insulation. See Table 1-2.

Aquiclude Rock Sorts Tablel-2 Aguiclude rock Stratum code Lithology Distribution Loose aquiclude Q Lime, silt lime and soil Along the banks of lime in top, scree gravel in Youjiang River, main under part of the basin Half hard sandstone and E2b Fine gravel soil inclusion Dongzeng-Namo area in mudstone crevasse silt gravel, mudstone reservoir upstream aguiclude Half hard sandstone and Ezf, E2n Mudstone, silt gravel, fine Broad area in the basin mudstone water insulation gravel, and coal bed rock Broken crevasse aquiclude T21, T2bf Tll Quartz gravel, fine gravel, Hills in basin periphery P2h silt gravel, calcrete, mudstone Carbonate crevasse Pbls, C2pm, C2h Limestone, biologic Southeast reservoir aguiclude limestone, dolomite

7

According to gushing ratio of well and font and ratio of flow to mean flow of underground water in drought season, the aquiclude strata are sorted as rich, moderate, poor. The index and standard are sown in tablel-3.

Index and Classification of Aquiclude Table 1-3 type Ground Crevasse water and rock Class index hole water crevasse water gushing ratio of >1000 >1000 >250 Rich well and font 100-1000 100-1000 100-250 Moderate (m3/d) < 100 < 100 <100 Poor Flux ratio in > 1 >10 > 1 Rich drought season 0.1-1 1-10 0.1 Moderate (/S) <0.1 < 1 <0.1 Poor Ratio of flow to > 3 > 6 > 3 Rich mean flow in 1-3 3-6 1-3 Moderate drought season < 1 <3 < 1 Poor

2. Hydrologic character of aquiclude a. Loose aquiclude

It is composed by quaternary alluvium and distributes on class I-IV terrace of Youjiang River bed, slime, silt slime and silt soil on top to be relative water insulation stratum. Its substratum is scree gravel aquiclude stratum, which are different in water richness and character, due to different effluent place and lithology.

(i) Scree gravel aquiclude on the first terrace It distribute broadly and continuous along the banks of Youjiang River, upstream in Bise City and downstream in dam area 1-2km in width and middle reach 200-500m in width. Elevation of the aquiclude stratum plate are 102-112m and 96-109m, 4-7m in thickness, some parts 13m in thickness. The stratum is good for water seepage. According to "engineering geologic report", the permeability is 5-25m/d. According to the Baise-Tianyang drilling and pumping test report by Second geology team of Guangxi geology bureau, permeability is 10.58-29.85m/d, which is moderate and great permeability. The volume of water is moderate or rich. Runoff ratio of single well is 209.94-831.01m 3 /d, some 1778.74m3/d. The strata include crevasse water, with bearing capability, water level 8-12m in general.

(ii) Scree gravel aquiclude on the second terrace

It distribute along the banks of Youjiang River, upstream in Bise City , downstream in dam area 1-2km, and middle reach sporadic distribution. The elevation of stratum bottom is 2-4m higher than river bed. The stratum is 6-9m in thickness. The stratum is good for 8 water seepage. According to "engineering geologic report", the permeability is 0.2-5m/d. According to the Baise-Tianyang drilling and pumping test report by Second geology team of Guangxi geology bureau, permeability is 12.79-16.40m/d, which is moderate permeability, poor permeability in some parts. The volume of water is moderate, poor in some part. Runoff ratio of single well is 11.12-914.84 m3/d, water level 7.5-1 im.

(iii) Scree gravel aquiclude on class III and IV terrace

It distributes discontinuously on machinery team, north Baiqiantun, south Sitang, Damei, and Nameng. The effluent place of scree gravel stratum is high because of the ascent of the terrace. The aquiclude stratum distributes discontinuously, with poor storage and good leakage because gulch cut hard. And the framework of gravel is filled by slime, so the permeability and aquiclude is poor. b. Half hard sandstone and mudstone aquiclude in crevasse stratum

It distributes on Dongzeng to Namo. The composition is fine sandstone, soil silt sandstone, mud stone in top and bottom and soil silt sandstone, mudstone, fine sandstone in middle part, which belongs to Tertiary Eocene Group (E2b). The ratio of sandstone to mudstone is 6:4. The sandstone in the stratum includes crevasse water and the mudstone can insulate water. The sandstone with aquiclude distributes in small area and little thickness. The flux ratio is 0.01-0.21/s, so the total water richness is poor. The coal sap locates in the aquiclude stratum, so it is the main water source for coal digging. c. Half hard sandstone and mudstone water insulation stratum

It distributes broadly on the reservoir area. The composition is mudstone, soil silt sandstone, fine sandstone and coal bed, which belong to Tertiary Oligocene Fuping Group (E3f ) and Eocene Nadu Group (E2b). The stratum doesn't include water, where there is crevasse water in the sandstone and silt sandstone. The crevasse water is interlaminar stressing water. Because he sandstone and silt sandstone are interlayer or lens, which are thin aquiclude or discontinuous, their capability for water supply and storage is poor. According to the coalfield geologic report, when the coal inclusion Nadu Group (E3n) stratum is tested by drilling and pumping, unit water volume is 0.0368-0.04581/s.m, permeability is 0.0378-0.443m/d. Runoff ratio of single well is less than 60m3/d. Most of the coal sap in the reservoir area locates in this water insulation stratum, and underground water in the interlayer or lens is the main water source for coal digging. d. Broken crevasse aquiclude

It distributes on hill around the north, west, and south basin periphery. The composition is quartz sandstone, fine sandstone, silt sandstone, calcium mudstone, mudstone, which belong to Triassic Middle Lanmu Group (T 21) , Baipeng Group (T2bf ), lower Luolou Group (T1 l) , Permian Upper Heshan Group (P 2 h) . The sandstone and mudstone is 9 interlayer or mutual layer. Mudstone doesn't include water. Sandstone develops from constructional rupture and includes crevasse water. The ratio of flow to mean flow in drought season is 0.478-3.5091/s.km 2. Flux of font is 0.01-0.641/s. The water richness is poor or moderate. The stratum is far from coalfield, so the underground water hasn't relation with the coalfield. e. Carbonate crevasse aquiclude It distributes narrowly on Nongluotun and Ganliangtun, southeast downstream outside reservoir area. The composition is limestone, biologic limestone, dolomite, which belong to Permian lower biologic reef (Pbls) , Carboniferous upper Maping Group (C 2Pm) and Huanglong Group (C2h) . The stratum develops from hornito, so include crevasse water in great thickness. The water richness is moderate. Runoff of underground river outlet at the end of Nayin reservoir is 13601/s. Heading runoff of fountain is 12.16-30.801/s. Water elevation is 160-190m and 10-50m underground. The stratum is far from coalfield, so the underground water hasn't relation with the coalfield. It is insulated from Youjiang River by Tertiary sandstone and mudstone, so the underground water hasn't relation with river water.

II. Underground water supply, runoff, drainage and dynamic character

1. Underground water supply, runoff, drainage

The underground water in the aquiclude stratum is supplied by rain. Upper terrace supply water to lower terrace in scree gravel of loose aquiclude. Youjiang River water impulsively filter water to scree gravel in Class I and II terrace along the banks in rainy season. Water from channel and field also filter to the stratum.

Youjiang River is the datum plane for the reservoir underground water. Underground water in the strata run from south to north and drain in the middle of the River. Class II and III terrace is cut by the gulch in the aquiclude, so some of the underground drain as font to gulch in the basin. Water in crevasse of half hard cataclasite drains as font to stream. Crevasse water of half hard cataclasite outside the basin drain dispersedly on the same direction as slope and drains as font to ground stream at the bottom of channel or foot of hill, finally to Youjiang River. Underground water of carbonate rock runs from south to north and drain into Youjiang River, Parts of which drains as oulet or font to ground, other parts of which drain as font in the connection with Tertiary mudstone.

2. Trend of underground water

The crevasse water in scree gravel aquiclude in Class II alluvium is continuous and stable, so the trend is stable. Water level of residence well changes less than 2m. Underground water locates in the crevasse of aquiclude in Tertiary sandstone and mudstone mixture, where water hard to supply, infilter, and drain, so the trend is stable. According to coal tunnel drainage volume data, yearly runoff change less than 3times, and water level of residence well changes less than Im. When impounding reservoir, water level will ascent

10 2-7m in sree gravel aquiclude along Class I and II along banks of Youjiang River.

Bed rock crevasse water of cataclasite outside the basin dispersedly drains as font to ground near stream. Underground water is supplied by rain and drains the water from rainy season in usual and drought season, so water level and volume is decreasing. Yearly runoff changes 10-20times.

Crevasse water in carbonate rock drain mainly in channel. Underground water are supplied and drained quickly. The trend is environmental, which changes with weather.

Section 3 Geologic Type and Character of Rock Engineering

According to lithology and physical mechanics, strata are grouped and sorted as four rock groups and two soil types.

I. Hardy limestone and gravel sandstone group

It is composed by limestone, gravel sandstone and some mudstone of Tertiary Eocene Dongjun Group (E 2 d) . It distributes on south reservoir Dongyin to east reservoir Napo on bar-strip area. Effloresce of bed rock surface isn't distinct. Single-axle saturation anti pressure intension is 20.5-50.OMpa.

II. Soft mudstone with hard sandstone group

It is composed by mudstone with silt sandstone, fine sandstone, sandstone with mudstone 2 1 of Triassic Upper Lanmu Group (T 21 ), Lower Lanmu Group (T 21 ), Upper Baipeng 2 Group (T 2bf ) , Lower Baipeng Group (T 2 bf ), Lower Luolou Group (T 1) , in all thickness level. Strata develop as mutual layer or interlayer and distribute around north, northwest, south basin periphery. It is soft , with the saturation anti pressure intension 20.5-50.OMpa and softening index 0.3-0.4. Sandstone is hard, but effloresce belt develops as joint fissure to three groups. One group is from north to east in obliquity 30 o .50° , the other from north to west in obliquity 42 ° -75° , the third from south to east in obliquity 480 . The third is little. The joint fissure intension is 2-3 pieces /m. The group is composed by soft and hard rock. When mudstone is softened by water to form lanky surface, 1-3m residual clay or eolianite slides along the soft surface to form coast and landslip.

III. Sot mudstone and silt mudstone group

It is composed by mudstone with silt sandstone and sandstone with mudstone of Tertiary Fuping Group (E3f), Baigang Group(E 2b), Nadu Group(E 2 n). The group tend to craze and landslide when exposure, soften when inundating. Surface effloresce is evident, according to 1/200,000 Baise hydro-geologic survey report, with 20-30m effloresce belt, 5-14m over-all effloresce belt, and 3-5 m effloresce on the dam. Effloresce rock breaks into fragment, gravel or wedge rock, so the mechanic intension is low.

11 IV. Moderate to hard lithified carbonate rock group

It locates on Napo county southeast of the area, and is composed by limestone, biologic limestone, dolomite, and siliceous earth of Permian Upper Heshan Group (P 2h), Lower Biologic Reef Group (Pbls) and Carboniferous Upper Maping Group (C 2 pm), Huanglong Group (C 2 h) . it is thick layer. It has good mechanic character, with saturation anti pressure intension 46.6-181.9Mpa and softening index 0.67-0.82. It develop to rock or solution wash. The area is small and doesn't show solution landslide. Lithified joint develop well in density 2 pieces/m: 50 0 Z160 , 3300 Z760 , 190° Z64' . The area tend to collapse and landslide when exploitation.

V. Single layer residual silt group

It locates on hillside and slope feet. Residual silt on Triassic hill is yellow silt with gravel and earth, 1-3m thickness, broken, tending to landslide along surface. Residual silt on Lower Tertiary wave hill is slime , silt, and charcoal earth, 2-5m thickness, low mechanics intension. Especially mudstone, gravel mudstone, and effloresce mudstone of Nadu Group (E2n) is brown red or yellow with white belt. It is easy to expand, so result in rupture of building, surface, and concrete road surface.

VI. Moderate to low compressing alluvium silt and gravel double layer group.

It distributes on Class I and II terrace along Youjiang River. The top is yellow or buff slime and silt, and bottom is gravel. Slime and silt is hard plastic or easy plastic, pressing index (al 2) 0.09-0.47MPa-1, bearing pressure 150-200Kpa in Class I and II terrace, 180-300Kpa in Class III and IV terrace. Gravel with gangue, silicon and snastone is intensive, bearing pressure 45OKpa. There is silt in Class I and II terrace, bearing pressure 100-15OKpa.

12 Chapter 2 Coal Resources In Reservoir Area

Section 1 Coal Resources Distribution In Reservoir Area

The reservoir locates on southwest of northwest Baise Baise. There are mudstone, silt mudstone, soil sandstone, silt sandstone, and fine sandstone of Tertiary Oligocene Dongjun Group (E2 , Dadu Group (E2n), Baigang Group (E2b) and Eocene Fuping Group (Ez/), Jianduling Group (Ezj). Miocene Dadu Group (E2n), Baigang Group (E2b) and Oligocene Fuping Group (Ezt) is the principal coal bearing rock, with 600-3000m in thickness, including 10-40 coal bearing layers and 2-7 coal excavation layers. Coal excavation strata is in layer or quasi-layer, same production type as stratum, with obliquity 100 -25° . Coal rock is half crystal or crystal wood coal, with head productivity 2700-4000 calorie, the highest 6000 calorie. The coal bed is mudstone or silt mudstone.

According to data in existence, There are Baise-Tianyang prospect area, Tianyang-Napo prospect area, Tianyang-Gonglou coamine, Baise-Yuejin coalmine, Baise-Dahe prospect area, Baise-Dawan prospect area, Baise-Donghuai prospect area , including No.3 and No.4 coalmine, Baise-Dongshun prospect area ,including No.1 and No.2 coalmine, Baise-Dongchan coalmine, and Dongzeng coalmine. The prospect areas are described as following:

I. Tianyang Prospect Area of Baise Field

Tianyang Prospect Area of Baise Field locates in the west middle Baishe coalfield, west from Baise Santang-Tianyang Baifeng, east to 2km from Tianyang county. Youjiang River run cross the section from northwest to southeast. The section is 17km in length, 7-12km in width, 155km2 in areas. The coordinate is east longitudelO6°17'- 106°50', north latitude 23°45' - 24°11'.

The section is divided to two segment. Shuipu segment on west section has IV2, IV3, IV4, B, D coal excavation layer from down to up. Naxu segment on east section has five coal excavation layer, one excavated. The coal layers are 0.62-3.73m in thickness. Coal bed elevation is 25-450 m, and 70-600m in depth. The known reverses of prospect area is 79.79 million ton.

II. Tianyang Napo Prospect Area of Baise Field

Tianyang Napo Prospect Area of Baise Field locates Youjiang River south bank in 2km from the northwest Napo. The section is 7.0 km in length, 4.0 km in width, 30.0 km2 in areas. The coordinate is east longitude 106 °43 '- 106°49', north latitude 23°40'23°46'.

The section has A, B, C, D coal excavation layer from down to up, each coal layers 0.8- 1.70m in thickness. Coal bed elevation is 141-45 m, and 0-158 m in depth. The known reverses of prospect area is 12.699 million ton.

13 III. Tianyang Gonglou Coal Mine of Baise Field

Tianyang Gonglou Prospect Area locates Youjiang River south bank in 20km from west Tianyang, where connect with Baise Youjiang section and Yuejin coal mine is opposite. The section is 3.2 km in length, 1.5 km in width, 3.5 km2 in area. The coordinate is east longitudelO6041'-106°44', north latitude 23044'-23°46'.

The section has A, B, C coal excavation layer from down to up, each coal layer 0.65- 2.00 m in thickness. Coal bed elevation is 180-218 m, and 0-420 m in depth. The known reverses of prospect area is7.322 million ton.

IV. Baise Yuejin Coal Mine of Baise Field

Baise Yuejin Prospect Area locates Youjiang River north bank in 20km from southeast Baise, where connect with Baise Youjiang section and Gonglou coal mine is opposite. The section is 1.5 km in length, 0.9 km in width, 1.5 km2 in area. The coordinate is east longitudel06°40' - 106 °42', north latitude 23°45'- 23 ° 47'.

The section has A, B, C coal excavation layer from down to up, each coal layer 1.65 - 2.00 m in thickness. Coal bed elevation is 180 - -300 m, and 0 - 418 m in depth. The known reverses of prospect area is 4.552 million ton.

V. Baise Dahe Prospect Area of Baise Field

Baise Dahe Prospect Area locates 12km from southeast Baise, where is Nabi county Dahe 2. village. The section is 6 km in length, 3 km in width, 18 km in area. The coordinate is east longitude 106038'44" -106040'56", north latitude 23046'42"~ 23°48'34".

The section has one coal excavation layer Nal, 0.80-1.80 m in thickness, average 1.lOm. Coal bed elevation is 123'-328 m, and 91-529 m in depth. The known reverses of prospect area is 12.38 million ton.

VI. Baise Dawan Prospect Area

Baise-Dawan Prospect Area locates 12km from southeast Baise, where is Nabi county Dahe village and Youjiang River runs cross the east section from north to south. The section is east west 4.5 km in length, north south 3 km in width, 14 km2 in area. The coordinate is east longitudelO6034' - 106036', north latitude 23°50' - 23052'.

The section has S,T, Sha coal excavation layer from down to up, each coal layer 0.60-2.21 m in thickness. Coal bed elevation is 125-200 m, and 0-325 m in depth. The known reverses of prospect area is 3.64 million ton.

VII. Baise Donghuai Prospect Area No.1 and No.2 Coal Mines

14 Baise Donghuai Prospect Area No.1 and No.2 Coal Mines locate lOkm from southeast Baise, where belong to Nabi village. The section is 12 km in length, 5 km in width, 60 km2 in area. The coordinate is east longitudelO6°33'36"-106 035'45", north latitude 23°50'07" -23°53'.

The section has A, B, C coal excavation layer from down to up, each coal layer 0.60- 2.88 m in thickness. Coal bed elevation is 166-258 m, and 0-347 m in depth. The known reverses of prospect area is55.15 million ton.

VIII. Baise Donghuai prospect area No.3 and No.4 Coal Mine

Baise Donghuai Prospect Area No.3 and No.4 coal mine locate 9km from southeast Baise, where belong to Nabi village. The section is east west 2.0-3.5 km in length, south north 1-2.5 km in width, 6 km2 in area. The coordinate is east longitudelO6°33'56"- 106°35'5 1,", north latitude 23°49' 10" 23050'46".

The section has A, B, C,I coal excavation layer from down to up, each coal layer 0.86- 1.94 m in thickness. Coal bed elevation is 136"-203 m, and 0-348 m in depth. The known reverses of prospect area is 22.008 million ton.

IX. Baise Dongshun Prospect Area No.1 and No.2 Coal Mine

Baise-Dongshun Prospect Area No.1 and No.2 Coal Mine locate 5.5 km from west Baise, whereis northwest Baise coalfield. The section is surrounded by hill in three faces, south in Youjiang River. The coordinate is east longitudelO6°33'07" 106035'30", north latitude 23052'56"-23°53'55". The section is 3 km2 in area.

The section has A, B, C,E, F, H, I, L coal excavation layer from down to up, each coal layer 0.65-2.13 m in thickness. Coal bed elevation is 158'--295m, and 0-463 m in depth. The known reverse of prospect area is 11.431 million ton.

X. Baise Dongcan Coal Mine of Baise Field

Baise Dong coalmine locates 5km from west Baise, where connect with Dongshun exploration section. The section is south north 2.5 km in width, east west 1.2 km in length, 3 km2 in area. The coordinate is east longitudelO6°33'09"-106'35'31", north latitude 23052'31 " -23053'45".

The section has A, B, C,I , L coal excavation layer from down to up, each coal layer 0.65-2.68 m in thickness. Coal bed elevation is 125--300 m, and 0-450 m in depth. The known reverse of prospect area is 4.683 million ton.

XI. Baise Dongzeng Coal Mine

15 Baise Dongzeng coalmine locates 9km from southwest Baise, where belong to Donghe village. The coordinate is east longitudelO6°35'15"-106 0 36'28", north latitude 23051'56"23052'52" .

The section has B, C, D coal excavation layer from down to up, each coal layer 0.48- 1.30 m in thickness. Coal bed elevation is 125-300 m, and 0-450 m in depth. The known reverse of prospect area is 124,000 ton.

Section 2 Coal Exploitation in the Reservoir Area

The mines in the reservoir area are exploited as early as year 1937, when the residents exploited the surface coal in indigenous method, so the productivity is 0.5t/year. From 1958, the close surface coal is exploited. Now there are state-owned coalmine, including Dongshen coalmine, Gonglou coalmine, Baise Nahuai coalmine, Donghuai coalmine, county-owned coalmine, and private coalmine. The productivity is 1.35 million t/year, including 580,000 ton by state-owned coalmine, 770,000 ton by private coalmine. The exploitation situation is described as following:

I. Dongshun Coalmine

The coalmine locates on reservoir upstream Dongshun village and belongs to state owned Baise Mineral Bureau. There are Dongshun No.1 and Dongshun No.2 coalmine in the coal hill. Actual productivity is 250,000 ton/ year. The coal hill area is 275,000 m2 . The nearest distance between main and subsidiary coalmine and Youjiang River is 11275 m. The coal layers are A,C, E, F, H, I, 8-11° in obliquity, 158--295m in coal bed elevation, 0-463 m in depth. The coal bed elevation of Dongshun No.1 is 150--233m. 1.89 million m3 gob area is formed, the smallest depth of which is 45m and depth of which along 150m Youjiang River banks is more than 200m.Dongshun No.1 will be closed on October, 2003. Dongshun No.2 started in 1997, 247-5 m in coal bed elevation. 40,000 m3 gob area is formed, the smallest depth of which is 27m and the nearest distance of which to Youjiang River banks is more than 1350m.

II. Gonglou Coalmine

The coalmine locates on reservoir downstream Tianyang County Baifeng village and belongs to state owned Baise Mineral Bureau. There are Gonglou and Yuejin coalmine in the coal hill. Actual productivity is 120,000 t/year. The coal hill area is 6.215million m2 , including private coalmine in Baifeng village. The further distance between top of gob area and Youjiang River bed is more than 120m. A transition road crosses Youjiang River bed to connect the Gonglou and Yuejin coalmine from place with elevation -25 and depth 125. The nearest distance between main and subsidiary coalmine and Youjiang River is 60 m. Coalmine altitude is more 120 m. Coalmine stratum is Tertiary mudstone. The coal layers aWre A,C, D, E, with 8-20° in obliquity, 120'-330 m in coal bed elevation, 0- 421m in depth. The coal bed elevation of Gonglou coalmine is 85--176m. 1.5 million m3

16 gob area is forrmed, the smallest depth of which is 120m.

III. Donghuai Coalmine

The coalmine locates on reservoir upstream Dongshun village. Donghuai and Nahuai coalmine belong to state owned Baise Mineral Bureau and the other 7 private coalmine is private. The private coalmines reshuffle according to the State regulation from 2000. Only Luenrong coalmine, Liaodingdu coalmine, and Qinwenli coalmine are checked and accepted by concerned department and can continue to exploit. The detailed report is in appendix Baishufa [2002]45 document. Actual productivity is 300,000 t/ year. The coal hill area is 1.415 million m2 . The nearest distance between coal exploitation scope and Youjiang River is 520m. The nearest distance between main and subsidiary coalmine and Youjiang River is 1160 m. Well altitude is more 121.0 m. The coal layers are A, B, C, I, andl2-17° in obliquity, 150-44m in coal bed elevation, 0-420 m in depth. The coal bed elevation of Dongshun No.1 is 150--233m. 1.89 million mi3 gob area is formed, the smallest depth of which is 45m and depth of which along 150m Youjiang River banks is more than 200m.Dongshun No.1 will be closed on October, 2003. Dongshun No.2 started in 1997, 247-5 m in coal bed elevation.1.015 million mi3 gob area is formed, the smallest depth of which is55m. The gob area doesn't connect.

IV. Dawan Coalmine The coalmine locates on reservoir upstream Dawan village. It is the reserve coal hill for Dongshun coalmine of Baise Mineral Bureau. There are 2 private coalmines, such as Limengxu and Liyuju. The private coalmines reshuffle according to the State regulation from 2000. Only Limengxu coalmine, are checked and accepted by concerned department and can continue to exploit. The detailed report is in appendix Baishufa [2002]45 document. Actual productivity is 30,000 t/ year. The coal hill area is 300,000 m2.2 The nearest distance between coal exploitation scope and Youjiang River is 1100m. The nearest distance between main and subsidiary coalmine and Youjiang River is 1600 m. Coalmine altitude is over 180m. The coal layers are Nal, and 8- 11° in obliquity, 35- 50m in coal bed elevation,l15-320 m in depth. 150,000mi3 gob area is formed, the smallest depth of which is 45m. The gob area doesn't connect.

V. Dahe Coalmine

The coalmine locates on reservoir upstream Dahe village. It is the reserve coal hill for Dongshun coalmine of Baise Mineral Bureau. There are 18 private coalmines. The private coalmines reshuffle according to the State regulation from 2000. 10coalmines, such as Ludeming coalmine, are checked and accepted by concerned department and can continue to exploit. The detailed report is in appendix Baishufa [2002]45 document. Actual productivity is 280,000 t/ year. The coal hill area is 750,000 m2 . The nearest distance between coal exploitation scope and Youjiang River is 9m. The nearest distance between main and subsidiary coalmine and Youjiang River is 140 m. Coalmine altitude is 116-200m. The coal layers are Nal, and 11-17° in obliquity, 120--330m in coal bed elevation, 91-520 m in depth. 1.2 million m3 gob area is formed, the smallest depth of

17 which is 3m. The gob area doesn't connect.

VI. Dahe Coalmine

The coalmine locates on reservoir downstream Baifeng village, where is near the state owned Goulong coalmine. There are 10 private coalmines. The private coalmines reshuffle according to the State regulation from 2000. Only Changsheng coalmine is checked and accepted by concerned department and can continue to exploit. The detailed report is in appendix Baishufa [2002]45 document. Actual productivity is 150,000 t/ year. The coal hill area is 750,000 m 2. The nearest distance between coal exploitation scope and Youjiang River is 550m. The nearest distance between main and subsidiary coalmine and Youjiang River is 1000 m. Coalmine altitude over 127.5m. The coal layers are A, C, D, E, and 8-20° in obliquity, 120--330m in coal bed elevation, 0-420 m in depth. 1.2 million m3 gob area is formed, the smallest depth of which is 35m. The gob area doesn't connect.

VII. Tianyang Napo Coalmine

The coalmine locates on reservoir downstream Tianyang Napo county. There are 20 private coalmines. The private coalmines reshuffle according to the State regulation from 2000. Only 8 coalmines, such as Napo coalmine is checked and accepted by concerned department and can continue to exploit. The detailed report is in appendix Baishufa [2002]45 document. Actual productivity is 220,000 t/ year. The coal hill area is 7.083 million m2 . The nearest distance between coal exploitation scope and Youjiang River is 250m. The nearest distance between main and subsidiary coalmine and Youjiang River is 500 m. Coalmine altitude 122-142m. The coal layers are A, B, C, D, and 5.12° in obliquity, 141--50m in coal bed elevation, 0-175 m in depth. Actual excavation altitude is 141--18m. 962,000 m3 gob area is formed, the smallest depth of which is 25m. The coalmine is close, so some parts of the gob area connect. But waste No.1 coalmine, Jinhong coal doesn't connect with unexcavated coalmine. The smallest distance between gob area is 100m.

VIII. Tianyang Shupu Coalmine

2 The coalmine locates along reservoir. The design area is 4.475 million m . The B, D main coal layer can be excavated partly, productivity shape 7-110, 110-420m in coal bed elevation , 0-550m in depth. The coalmine isn't excavated at present.

There are 61 coalmines, 4 state owned coalmine, including Dongshun, Gonglou, Baise Nahuai, Donguai coalmine, and 57 private coalmine. The private coalmines reshuffle according to the State regulation from 2000. Only 26 coalmines, including Napo coalmine, are checked and accepted by concerned department and can continue to exploit. The other 31 private coalmines are closed because they don't accord with production security regulation. They can't affect the reservoir construction. The detailed report is in appendix Baishufa [2002]45 document. The location and description of coalmines are

18 shown in table 2-1.

Before reshuffling, the private coalmines produce out of order. Illegal coalmine and waste private coalmine distributed on Dongshun, Donghuai and Nahuai coalmine area are in elevation over 120m. They don't damage the reservoir, because they are far from reservoir and excavation sap hasn't no hydro-relation with Youjiang River. Illegal coalmine and waste private coalmine distributed on Napo and Baifeng coalmine area are in elevation over 115m. They have hidden security and are possible to damage the reservoir, because they are near from Youjiang -River banks. The local government reshuffled the trouble coalmine from 2000, according to state law and regulation. All the illegal private coalmines are closed. Mild land sink are backfilled. Existing sap hasn't any hydro-relation with Youjiang River, so won't damage the reservoir.

19 itation of Coal Mines along Banks of the Reservoir Table2-1 Main Coal Mining Layer Minimum Minimum Distance Worked Distance Water Yield hput Elevation between the out Worked Elevation of between the in the Mine Time and ~~~t)Name Brid f he NgAreaAreas out Volume Worked Worked out PtCarving Flooding Reason for Remarks m)DepthBui Bothe Mn0,000 (10,000mb out Area(m) Areas (in)Depth ~(m)Botm and Youjiang (1 and (mh ShutinngShutin (in) ~(in) in)Ymjan m3 h

No carving or cracking, ro be shut there are some *n by small illegally 2004 30-465 90.-345 0 189.9 -90 200 Normal 20. care out None because 200 mnes in o r u Lutou Bao, of d0 out but they have rtesore been filled esources out. No carving or cracking, there are some small illegally 5-247 125-127 0 4.0 -90 More than Normal 250 camines inu None Stae 200 mie nowned fishing pools, but they have been filled out.

160-350 520 50-70 570 Normal 30. None None tate owned

Normal 5, till can be T 0.73. 130-20 150-60 1190 3 2.2 150-100 1270 Maximuml None None xploited 0. ~~~~r 12 00 /ears hut in bv Coal Mines along Banks of the Reservoir Continued Table2-1 Main Coal Mining Layer Minimum Minimum Distance Worked Distance Water Yield hput Elevation between the out Worked Elevation of between the in the Mine Time and )Ot) N lO) Name DphDepth BreBuried ofteof the MinnMining A (10,000(10,0OOM3)Areas out Volume ouPra(iAeatnWorked Worked out Pit Carving Flooding Reason fo Remarks (m) Depth(m) BottomBottom andand Youjiangingrea inm) re(m ArasanYoujiang (m33h)Shutin/h) (in) (mn) (in)

Nhut in by Sept. 1, haA 21074 50-170 120-0 2560 9 18 120-89 2620 Maximuml None None 2002 C 1.89 0.because of un-qualifi C______2__0_ _ 80_ 150_ 130~20 _ 3650 3.8 8.0 130~70 3690 _ None None cation 3hut in by Normal 5, Sept. 1, ase3A 1.84 30-180 120-0 2555 3.6 6.5 110-85 2585 Maximuml None None 2002 hase 6 C 1.74 0. because of

0un-qualifi ______catio n Still can A 2.1 Normal 5, be C 20 80-150 130-20 3650 3.8 8.0 130-70 3690 Maximum None None exploited 100 for 4

______~~~~~ ~ ~_ ~~~years _ _ _ Normal 5, Still can C 2.2 25-130 100-20 4050 6.0 13.0 100-60 4100 Maximum None None be 100 exploited ______~~~~~~~~~~~~~~~~~~~~~~~~~~~~for1 year ____ Shut in by Sept. 1, A 3.4 Maximum 2002 C 30-180 115.4-2 4250 4.2 14.3 71.5-115.4 4100 4 None None because of un-qualifi ______~~~~~~~~~~~~~~~~~~~~~cation there arel some small )n of Coal Mines along Banks of the Reservoir Continued Table2-1 Main Coal Mining Layer Minimum ~~~~~Minimum Minimume Wred Distance Water Yield hput Elevation between the out Worked Elevation of between the in the Mline Time and lot) NI Depth Buried of theA Areas out Volume Worked Worked out Pit Carving Flooding Reason for Remarks Name Depth(m) Bngom Minm rea (10,000 (10,000m3) out Area(m) Areas and 3/h) Shutin 2 (in) Det (M)Bto and Youjiang in ) Youjiang m (in) (m)

Shut in by 3ept. 1, 2002 3 I 1.6 25-200 114.5-0 3600 1.9 3.1 120-75 3200 Normal 5. None None because of un-qualifi caation Shut in by 2000 T 1.5 160-0 150-0 1975 4.2 6.3 100-80 2010 Maximum None None because of 3.5. ~~~~~~~dryout of the resources Normal 5, Still can I 1.4 160-10 150-20 105 8.6 12.4 110-60 160 Maximuml None None be IMaium .5 6060 100061 52NnNn 7.6 7.9 30 exploited ______~~~~~~5 years ~~~~~~~~for Normal 5, Still can I 1.53 160-60 190-30 610 5.2 7.96 170-90 630 Maximuml None None be 0. exploited ______f or 3 yeafsr_3_ye a rs Still can No-Mal 5, e I 1.70 160-30 150-45 900 3.1 5.27 120-80 970 Maximuml None None exploited 00 for 7.5 ______~~~~~~ ~~~~~~~~~~~~~years__ _ _ _ Normal 5, Still can H 1.30 100-30 110-15 10 4.20 5.46 110-80 35 Maximuml None None be 00 exploited ______f orr 22_ye yeao a rs Exploitation of Coal Mines along Banks of the Reservoir Continued Table2-1

Main Coal Mining Layer

htinimumMinimume Worked MinimumDistance Water Yield hput Elevation between the out Worked Elevation of between the in the Mine Time and lot) NameBfid fth Mnng Area Areas out Volume Worked Worked out Pit Carving 3 Flooding Reason for Remarks qDName t Buried of th(10e,000 (1O,000m ) out Area(m) Areas (3/h) (in) Depth(m) Bottom and Youjiang (1 and Shutinhum (in) (mn) in2 ) Youjiang (in)

Shut in by 2000 B 1.30 15-125 130-54 400 1.8 2.52 120-90 540 Maximum None None because 4. ~~~~~~~~~ofdry out of the .______reso u rces Shut in by 2000 C 1.60 0-280 130--150 350 4.17 6.67 130-50 460 Maximum None None because 3. Of dry ot°h of the resources Still can I ~~~~~~~~~~~~~~~~~~MaximumNoeNoe exlie D 1.40 30-90 150-6 600 2 2.80 110-90 120 None None fexploited 5 O . ~~~~~~~~~~~for2.5 ______~~~~ ~~~~~~~~year Normal 5, Inundated Still can A 1.40 30-100 123-54 105 2.15 3.01 120-80 125 Maximum None in 200lfor be 103 floods exploited Actual ______for 3 year Normal 5, Still can Maximuml Inundated A 1.43 20-146 30-100 105 3.2 4.5 100-70 175 o None in 200lfor beexploited 0~~~~~~~~~floods for 2.5 Actual 2. ear

Normnal5 Stil can 1 1.20 30-100 178-56 1550 2.10 3.26 140-70 1640 Maximuml None None be Exploitation of Coal Mines along Banks of the Reservoir Continued Table2-1

Main Coal Mining Layer Minimum Minimume Worked Distance Water Yield hput Elevation between the out Worked Elevation of between the in the Mnne Time and ot) slamDeph Bried of te MiingAre Areas out Volume Worked Worked out Pit Carving Flooding Rason for Remarks °ot) 1 2 3 Name D(em)t(in)Depth Depth(m)Buried Bottomof themm andMind Youjiangingrea(10,000 g in ) (10000m ) out Area(m) AreasYoujiang and (M3/h, Shutin (in) (in) (in)

Normal 5, Still can E 1.3 50-250 0-120 600 1.8 2.3 120-70 680 Maximum None None be 6, exploited Actual 2. for 7 year Shut in by Sept. 1, E 1.8 10-154 60-120.5 245 4.3 7.7 120-80 290 Maximum None None 2002 3. ~~~~~~~~becauseof un-qualifi ______~~~~~~~~~~~~~~~~~~~~cation Shut in by Sept. 1, I 1.3 15-230 20-110 85 2.1 2.7 110-80 115 Maximum None None 2002 5. because of un-qualifi ______~~~~~~~~~~~~~~~~cation Shut in by Sept. Normal 1, 2002 B 0.8 37-55 88'-75 10 2.43 1.94 88-75 25 0..None None because 0.3~~~~~~~ ~of un-qualifi

______~~~~cation _ _ _ _ _ Yuejin 2I18 MNine C 2.1 B 1.56 Gonglou 1.5 0 150- 0 148.56 241.04 176-0 0 None None State-ow -. 1.5 j IR 7-, -199ne Exploitation of Coal Mines along Banks of the Reservoir Continued Table2-1

Main Coal Mining Layer Min'mum ~~~~~Minimum MIniu Worked DistanceWaeYel DistanceWaeYil hput Elevation between the out Worked Elevation of between the in the Mine Time and lOt) Namehe (Mining Area Areas out Volume Worked Worked out Pit Carving Flooding Reason for Remarks Depth Buried Bnoh t te 910,000 (10,000m) (n Det(m) Botm and Yojin out Area(m) AreasMand (m/h ShutinngShin 3 (in) (in) in)Yojan m h

Mormal 5, Still can A 1.55 5-307 170-172 550 40.60 62.93 170-150 565 Maximuml None None be 00 exploited ______~~~~~~~~~~for8 year-s Still can Normal 5, be B 1.25 56-107 121-73 770 9.40 11.75 121-73 770 Maximuml None None exploited 0r for 1.5

Normal 5, Still can A 1.4 20-90 182-80 1050 6.0 7.9 182-38 1075 Maximum None None be B 1.2 exploited ____ lOo~~~~~~~~~~~~~~~~~~~~~~~~~~~~~0 fr 2 years____ Shut in by

Normial 5 ,Sept. 1, C 1.20 19-70 185-94 1050 1.8 2.2 185-100 1070 Maximum None None 2002 100 un-qualifibecause of

______~~~~~~~ ~~~~~~~~~cation_ _ _ _ Shut in by 2000 because of B 1.20 20-100 195-135 1300 2.2 2.6 165- 148 1300 Normnal So None None dry out of the ______~~~~~~~resources Shut in byl Sept. 1 1.4 30-170 40-115 50 9 12.6 115-100 85 Maximum None None 2002 2. ~~~~~~~~becauseo) Exploitation of Coal Mines along Banks of the Reservoir Continued Table2-1

Main Coal Mining Layer Minimum ~~~~~Minimum Minimncm Worked Distance Water Yield hput Elevation between the out Worked Elevation of between the in the Mine Time and lot) NameBuid f he Ming Area Areas out Volume Worked Worked out Pit Carving Flooding Reason for Remarks Deth Buidef he I . 10,000 (10,000m 3 out Area(m) Areas and (m) Depth(m) Bottom and Youjiang ShutinSmutin (in) (in) m-i) Youjiang (mn)

Shut in by Sept. Normal 5, 1, 2002 D 1.00 0-51 128-75 200 0.21 0.21 91-79 220 Maximum None None because 100 of un-qualifi cation Still can Normal 5, be B 1.6 15-105 110-33 310 3.99 6.38 94-72 330 Maximum None None exploited 100 for 2

Still can 108- Normal 5, be D 1.60 15-50 500 1.26 2.02 50-14 515 Maximum None None exploited 160 ~~~~~~~~~~~~~~~~~~~~~100 for 9

______~~~~~~~~~~~~~~~~~~~~~~~~~~ears There are cracks on the Still can B 1.00 53-'79 76-41 54-37 Normal 5, ground, and be D 0 °90 1583-17090 171614210 250 2.70 3.78 90-72 275 Maximum has been None exploited D l11-200.90 18-100 90-72 ~~~~ ~~~~~~~~embanked ~ ~~100for 3 and Sealed years

______~~~~~~~~~~~~~~~~~~~~~~~off _ _ _ _

NormalO.5, 2Shut in by B 1.0 6-69 118-50 750 5.28 5.28 118-55 765 Maximum None None 2000 because of

dryr nutt lxploitation of Coal Mines along Banks of the Reservoir Continued Table2- 1

Main Coal Mining Layer Mfinimum Minimum Distance Worked Distance Water Y-ield hput ~~~~~~~Elevation between the out Worked Elevation of between the in thIn Time and lot) Depth Buried of *A Areas out Volume Worked Worked out Pt Carving Flooding Reason for Remarks lO) Name Det Bre o h Mm(10,000 (10,0OOM3) ouPAe(mtresan m3 h (m) ept(m)Bottom and ngreaAes ou nd m3h Shutin (in)epth m) Y ujma g Mn) Youjiang

Shut in by Run Sept. 1,through B 1.20 63- 148 72'-28 1300 17.92 21.50 62--8 1325 Normal 3. None None 2002 with because of Lnqiu un-qualifi Coal

______~~~cation N f ne Normal 0.5, Shut in by B 0.97 9-87.5 116-62.5 1600 1.73 1.68 117~-63 1635 Maximum None None 2000 1. ~~~~~~~~because of

______~~~~~~~~~~~~~~~~~~~~~~~~~~~dryout Shut in by

D 0.80 0-107 141-48 1700 7.2 5.76 141-48 1725 Normal 0.50 None None 2000 because of

______~~~~~~out ~~~~~~~~~dry Shut in by Normal 0.2, Sept. 1, D 1.0 41---73.8 119-86.2 1750 0.96 0.96 119-82 1750 Maximum None None 2002 10 because of un-qualifi ______~~~~~~ ~~~cation Normal 5, Still can B 51-211.20 99-141950 1.43 1.72 30--15 ~~~~~~Maximum None None be B 1.201-21 99-141 950 1.43 .72 30-15 975 100 exploited ______~~~~~~~~~~~~~~~~~~~~~~~~~~~for5 years Still can I ') A A'l ~~~~~~~~~Nornal5, be Th I1.-1j'~OI ~ 1)A...A'I I'V7A AOO 1 A4Z If~ r%L 1I A X.:..1 - T- T- Exploitation of Coal Mines along Banks of the Reservoir Continued Table2-1

Main Coal Mining Layer Minimum Nf~~~~inimum Minimume Worked Distance Water Yield hput Elevation between the out Worked Elevation of between the in the Mine Time and lOt) Name epth Buried of the MngAraAreas out Volume Worked Worked out PtCarving Flooding Reason for Rem-arks lot) Na (in)ningth(m) (10,000 (10,000M3b out Area(m) Areas and PtShutin m) Depth(m ) Bottom and (ian i 2 ) Youjiang | m|Chi (mn)

Normal 5, Shut in B 1.2 50- 100 74-30 800 3.72 4.46 74-45 800 Maximuml None None by 2000 00 because ______~~~~~~~ofdry out Normal 5, Shut in B 1.40 16-91 '100-25 550 3.24 4.21 75-40 570 Maximuml None None by 2000 B 1.20 0 because ______~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ofdry out Normal 0.5, Shut in by B 0.97 30-85 90-50 90 1.20 1.19 66-50 95 Maximum None None 2000 C 1.0 1.because of 10 ~~~~~~~out ~~dry_____ Normal 5, Shut in by 1.0bcue30~-100 80~-20 85 0.065 0.011 50-38 86 Maximum None None 2000 I I l~~~~~~~~~~~~~~~~~10dryout ____ Chapter 3 Relationship between Coal Mine and Reservoir

Within the reservoir area, there are 61 existing state-owned and private mines, among which 4 are state-owned mines (mainly Dongsun Coal Mine, Gonglou Coal Mine, Nahuai Coal Mine of Baise City and Donghuai Coal Mine). Donghuai Coal Mine is newly-built coal mine that has been put into operation in December 2002, and the other three coal mines have poor reserves that Dongsun Coal Mine will be closed by the end of 2003. The annual production capability of these four coal mines is 580,000 tons. 57 coal mines are private and can be divided into Napo town diggings, Baifeng villages diggings and Dahe diggings. At present, within the reservoir area only 26 coal mines such as Napo town coal mine which have passed acceptance continue mining, and the other 31 private coal mines have been closed and blocked up due to unqualified in rectifying, cannot meet the requirements of safety production or drying up of resources. Therefore, they will not influence construction of the reservoir. The existing 26 private coal mines will be closed within several years one after another (see table 2-1) due to some of them have been exploited for almost 10 years and reserves within the diggings decreased rapidly. The annual production capability of these 26 coal mines are 770000 tons.

The coal stratum of the existing 30 coal mines (including state-owned coal mines) belong to the new third system Yongning Qunnadu group or Baigang group, with thickness over 300m, lithology of coal stratum of every diggings are similar which alternately consist of mudstone, silty sand mudstone, silty sand rock and fine sand rock. In which, silty sand rock and fine sand rock are water-containing stratum and the other are water insolated or relative water insolated stratum. The water-rich quality of water-containing silty sand rock and fine sand rock is weak, unit water surging of hole is 0.0368 - 0.0458 is * m, water permeability is poor with osmotic coefficient 0.0378- 0.443 m/d. In coal stratum usually have three exploitable stratums and thickness of every stratum is over 300m. On the top of coal stratum is Fuping group, which lithology is mudstone or silty sand mudstone with thickness over 300m as good water insolated stratum. In every diggings, the forth system is poor developed and alluvial hardpan is only in partial river valley terrace. The main water resources of mining pit in every diggings are from water-containing stratum of silty sand rock and fine sand rock in coal stratum which haven't notable hydropower connection with surface water and hole water of hardpan of the forth system, or close relation with rainfall. There are no Karst landform and the water surging of mining pit is 0.2 - 30 m3/h.

I. Influence on Reservoir Safety and Leakage of Reservoir caused by the Exploitation of Coal Mine

The gallery systems of the existing 30 mine coals of the reservoir area are relatively separate and closed system, nearly no distribution of hardpan around the mine entrance, the elevation of mine entrance is over 118.8m and mining pit is separated from the Youjiang River by thick mudstone. Luoan Coal Mine and Changsheng Coal Mine of Baifeng village diggings, the Fifth Coal Mine, Yutao Coal Mine, the Seventh Coal Mine, Lanqiu Coal Mine, Runsen Coal Mine and Napo town Coal Mine of Napo town diggings

29 are located in river valley, the minimum distance of main shaft and auxiliary shaft of every mine is 500m and the maximum distance is 1900m; the pit shaft go through hardpan with high waterproof and good measures preventing from penetration due to concrete breast wall are adopted. The topping of hardpan is clay layer that is weak penetration and belongs to relative water insolated layer. By calculation, the back-water height is between 2-7m, and it's shown in hydrology observation data that during level period (flood period) the varying range of groundwater is between 1-2m. After water storage of the reservoir, the scope of back-water height will not change too much therefore, water storage of the reservoir will not cause reservoir water pouring into the mines. To sum up, mine pits have no hydropower relation with the Youjiang River on the hole; there is no underground water-eroded cave and underground river around all the stratum of diggings; therefore, mining pit will not communicate the Youjiang River with other surface water or stream and caused any leakage of reservoir water. In the past, present of in the future, water storage will not flood the mining pit and influence any exploitation and production of the mines.

Mining pits of the closed 31 coal mines have been blocked up and will not influenced construction of the Reservoir. No evaluation in the following sections.

II. Flooding Problem of Mine Entrance and Ground of Exploitation Area

Elevation of mine entrances of the existing 30 coal mines in the reservoir area (including main shafts and auxiliary shafts) are over 120m except Ludeming Coal Mine of Dahe diggings, which at least 3.8m higher than the water surface of Youjiang River after water storage of the reservoir (the normal water storage level is 115m), therefore, the mine entrances will not be flooded. Elevation of Ludeming Mine (including main shaft and auxiliary shaft) is 114.2m and 116m separately that are lower than normal water storage level of 115m and Huangshaocheng Mine communicates with Ludeming Mine, so this two mines will be both flooded (mines and tunnels of these two mines were flooded by floodwater in 2001). But time limit of exploitation for these two mines are within 3 years and the water storage time of the project is in January 2007, according to relevant items of Guangxi Minerals Resources Management Regulations, the longest period of validity for mine exploitation permit are 3 years and the above 2 mines will be closed and blocked up according to the law before water storage; therefore, water storage of the reservoir will not influence the exploitation of the above two mines.

In addition, except that elevation of partial ground of Gonglou Coal Mine along the banks and some parts along the Youjiang River right banks of Yuejin Coal Mine (near the brick field) are lower than 115m, ground elevation within exploitation area of other 29 mines are all over 120m, therefore, there will be no flooding problem for the exploitation area after water storage of the reservoir. In exploitation area of Gonglou Coal Mine, except that ground elevation of bunker near the banks (gallery, delivering tower and platform balance) and dock are lower than normal water storage level of 115m, the other parts of the mines are over 125m and will not be flooded after water storage. Ground elevation of partial zone along Youjiang River Banks of Yuejin Coal Mine (near the brick field) are

30 lower than 115m, of which delivering tower and waste abandoning track will be flooded after water storage. In the Resettlement Action Plan, the above influenced issues have been disposed.

III. Mining under the Water of Riverbed

For the existing 30 coal mines in the reservoir area, only Gonglou Coal Mine have carried out trial mining under the water of Youjiang River at present. The trial mining plan is prepared by Coal Scientific and Research Institute Tangshan Branch, which meet the requirements of Coal Industry Design Specification. In this trial mining plan, size of waterproof safe coal bysmalith shall be calculated by the following formula 3-1:

H=H1 +H 2 (formula 3-1) In which: H- size of waterproof safe coal bysmalith Hi-maximum height of water guiding crack belt H2 -thickness of protection stratum

As a result of calculation, H=64m, combining the principle of mining under water with the actual situation of diggings, the upper limit of exploitation is -25m that the minimum size of waterproof safe coal bysmalith is 72- (-25) =97 m (the lowest elevation of Youjiang riverbed is +93m, the fourth system alluvial layer of 21m is under the riverbed and the minimum elevation of alluvial layer bottom is calculated by +72m). The actual trial mining began from 2001and 80000 tons of coal has been exploited until now. Analyzing the results of trial mining, the thickness of waterproof coal bysmalith is over 120m with good water isolation, mining pit has no hydropower relation with Youjiang River and water surging of mining pit in trial mining area is only 3m 3/h, therefore the trial mining is successful until now and some experience have been gained. After water storage of the Youjiang River, the depth of river water will increase about 10m and water pressure will increase accordingly, but for the large and thick waterproof safe coal bysmalith, the possibility that waterproof coal bysmalith will be destroyed by water pressure increasing is very low (in flood history of Youjiang River, most water pressure were over this pressure, such as flood water level of 115.36m in 2001). Therefore, water storage of the reservoir has no influence on the mining under water of Gonglou Coal Mine, the other 29 coal mines will not mine underwater and it's still suggested that mining under Youjiang River of private coal mines shall be strictly prohibited in the future.

IV. Illegal Exploiting and Abandoned Private Kilns and Coal Mines

There are some illegal exploiting private kilns around the four state-owned Dongsun Coal Mine, Donghuai Coal Mine, Nahuai Coal Mine of Baise city and Gonglou Coal Mine, which is product of the early stage of Reform and Opening Police with the features of small exploitation scale, shallow exploiting depth (generally about 20-40m) and illegal exploitation. At present, local government have closed such kilns as abandoned private kilns.

31 For abandoned private kilns and mines around the three state-owned Dongsun Coal Mine, Donghuai Coal Mine, Nahuai Coal Mine of Baise city, elevation of mine entrance is higher than the water level elevation of Youjiang River after water storage of the reservoir, exploiting tunnels have no hydropower relations with the Youjiang River, in the past and at present these mines and kilns are not passage between the Youjiang River water and the production tunnels, and after water storage they also will not become the passage communicating Youjiang River and production tunnels. The secrete mining of several private kilns of Dongsun Coal Mine once caused settlement of shallow ground and pound water filled into the tunnels that the results was not serious; the settlement ground have been backfilled and compacted for almost ten years that influence on the production of coal mine have been removed.

Abandoned private kilns and mines around Gonglou Coal Mine are shown in Table 3-1. It's shown that most abandoned mines and private kilns have no hydropower relation with the Youjiang River that water storage only influence a little on the mine production; entrances of several private kilns are relative low, but these entrances and tunnels have been blocked up. Sections near private kilns which elevation lower than 116m have also been investigated for empty-mining area settlement, water guiding cracks have been backfilled and proper locations have been selected for permanent sealing and blocking for coal tunnels, and empty-mining area and production area of illegal exploiting abandoned private kilns have been isolated for waterproof. Therefore abandoned mines of illegal exploiting abandoned private kilns nearly have no influence on production of the coal mines.

32 Waste and Illegal Coalmine Near Gonglou Coalmine Table 3-1

Geography Coordinate Altd Horizontal Horizontal of inlet AltUe distance distance Name or No. Entrance between inlet between inlet X Y ( mE) and Youjiang and production River (m) tunnel (im) 1 2630704 36365936 115 30 0 2 2630680 36365944 114 30 0 3 2630640 36365960 114 30 0 4 2630215 36366265 116 75 0 5 2630150 36366320 120 75 0 6 2630115 36366300 115 60 0 North 7 2630080 36366330 120 65 0 North 8 2629975 36366340 115 40 0 North 9 2629985 36366390 127 50 0 North 10 2629990 36366420 128 75 0 North 17 2629470 36367465 116 70 0 North 18 2629500 36367490 120 50 0 XiShanping 2629250 36367565 130 325 100 Xierping 2629225 36367560 136 340 115 Xiyiping 2629250 36367550 143 355 130 Jiufengjing 2629080 36367765 157 550 120 Xifengjing 2629010 36367820 175 640 140 Xierpingdong 2629045 36367930 145 650 100 Dongbaxijing 2629035 36368140 139 660 0 Dongsanping 2629060 36368105 134 720 30 Dongerping 2629095 36368110 137 735 40 Dongyiping 2629140 36368115 141 750 50 Dongbajing 2629050 36368300 137 800 0 Dongqijing 2629080 36368310 137 830 0 Dongqixijing 2629045 36368160 147 710 0 Dongxinping 2628950 36368120 152 830 50 Dongyifengjing 2628870 36368170 183 920 0 Dongwuhao 2629010 36368475 145 950 0 DOngliuhao 2628990 36368490 152 980 0 Dongyihao 2628970 36368480 148 985 0 Erxiejing 2628855 36368390 150 1040 60 Erxiefu 2628845 36368420 150 1060 70 Sihaojing 2628900 36368555 180 1065 20 Dongsanhao 2628840 36368545 170 1130 70 Dongsihao 2628800 36368555 170 1170 110

33 Geography Coordinate Altitude Horizontal Horizontal of inlet Af distance distance Name or No. Entrance between inlet between inlet Entranc and Youjiang and production (in) River (m) tunnel (m) Dongxingpinger 2628810 36368455 168 1110 150 Dongsanfengjing 2628700 36368540 200 1260 180 DOngsifengjing 2628665 36368595 213 1305 200

D2jing 2628790 36368850 158 1230 50 D3jing 2628775 36369025 170 1260 50

V. Safety Distance of Mining along the Banks

According to the first item of Clause 2-75 of Coal Industry Design Specification, after water storage of the reservoir, it shall meet the requirements that the minimum height (width) of safe coal column shall be equal to the maximum height of water guiding crack belt while mining under super water body, and thickness of 5-30 meters for protection layer shall be added in accordance with exploiting thickness and lithology.

Experiential Calculation Formula for Maximum Height of Carving Zone and Water Guiding Crack Gradient of Rock layer Compression Management Height of Height of Water guiding Coal Bed above the strength of measures for falling sinking crack (m) coal bed Rock layer exploiting top Belt (m) above coal bed plate 2 (kg/cm ) 0-54 Mudstone 200-400 All sinking Hc=( 3 -4)M looM Silty sand Hf + 5.1 rock and etc. (3.3n+3.8)

M is accumulative total exploiting thickness, Hc ,.-maximum height(m) of carving zone, Hf is maximum height of water guiding crack (m), n is layers of layering exploiting, compression strength of rock is saturated uniaxial limit strength.

As all exploited coal layers of the reservoir area are all thin coal layers (thickness of coal layer less than 1.3m) or medium thickness coal layers (1.3-3.5m) that are all less than 1.8m and.exploited by single layer, n shall be used as 1. Exploitable coal layers are three and the total thickness will be 4. lm.

Height of water guiding crack: looM Hf= + 5.1 = 57.75+5.1=63(m) 3.3+3.8 34 The thickness of protection layer is 30m, the width of safe coal column near the banks of Youjiang River shall be 63+30=93(m). Considering the banks width influenced by water washing and eroding during the exploitation period will reach about lOm, the waterproof safe distance for mine exploitation in the reservoir area along the banks shall be 110m. Evaluation will be carried out for state-owned coal mines and private coal mines separately as follow:

A. State-owned Coal Mines

At present, the minimum distance of exploiting boundary and empty-mining area between the three state-owned Dongsun Coal Mine, Donghuai Coal Mine and Nahuai Coal Mine of Baise city with banks of the Youjiang River is over 1O1m, as water of Youjiang River will not overflow the riverbed after water storage of the reservoir, boundary location for safe exploitation along banks will not be influenced by water storage.

Gonglou Coal Mine have implemented successfully trail mining under Youjiang River water body for 12 years before water storage of the reservoir. As water of Youjiang River will not overflow the riverbed after water storage, the original exploitation condition haven't been changed by water storage and the size of waterproof safe coal bysmalith of empty-mining area along riverbank and under the water body can meet the requirements of safety production, water storage of the reservoir have no great influence on the safety distance of bank exploitation of Gonglou diggings.

B. Private Coal Mines

There are 57 private coal mines formerly and these coal mines can be divided into Napo town diggings, Baifeng village diggings and Dahe diggings by distributing location. From 2000 up to now, private coal mines have stop production to rectify and improve according to the state policies and regulations. At present only 26 coal mines such as Napo Coal Mine within the reservoir area, which have passed acceptance of relevant government departments, are approved to continue exploitation; the rest 31 private coal mine have been closed and blocked up due to unqualified for safety production or resources have been dried up, therefore, water storage of the reservoir will not influence the 31 private coal mines.

Among the existing 26 private coal mines which is still in production, the exploiting boundary and empty-mining area of 5 coal mines of Dahe diggings of Baise city are less than lOrm from the banks after water storage (for details see talbe 3-3); in which Ludeming Coal Mines and Huangshaocheng Coal Mines that have flooding problem as describe above shall be closed according to the law. The minimum distance from empty-mining area of Huangjianrning Mine and Huangjiafa mine to the banks of Youjiang Reservoir are 35m and 39m separately and the minimum burying depth are 20m and 30m, therefore, it's suggested to close these tow mines before water storage. The proposed exploitation boundary of Weiwuba Mine is 105m from the banks of Youjiang

35 Reservoir and the minimum distance of empty-mining area from the banks is 160m, it's suggested to re-definite exploiting boundary as lOim as safe exploiting distance along the banks. For the above five coal mines, except the time limit for exploitation of Weiwuba Coal Mine is 5 years, time limit for the other four coal mines are 3 years, and the water storage time of the project is in January 2007, and according to relevant items of Guangxi Minerals Resources Management Regulations, the longest period of validity for mine exploitation permit are 3 years and the above 4 mines will be closed and blocked up according to the law before water storage. Therefore, water storage of the reservoir will not influence exploitation of the above 5 mines.

Existing Coal Mines with Safety Exploitation Distance Less than 110 m Table 3-3 Location of Minimum Entrance Distance Entrance Exploitable between Name Elevation Coal Reserves Exploitation Note X Y (m) (lOOOOtons) Boundary and the Banks (im) 148 19.83 105 Adjust Weiwuba 2635963 18668560 boundary Huangjianming 2634453 18667609 148 7.57 10 Suggest be ______~~~~closed Huangjiafa 2634498 18667825 161.3 13.08 9 Suggest be ______~~~~~~~~~~~~closed Ludeming 2633501 18667397 118 9.45 105 flooded Huangshaocheng 2633495 18667219 121 11.09 105 flooded

For the other 21 private coal mines, the minimum distance from exploitation boundary and empty-mining area to the Youjiang River banks is over lOim, as the water of Youjiang River will not overflow the riverbed after water storage, location of safety exploitation boundary will not be influenced by water storage.

VI. Ground Settlement on Empty-mining Area and Water Guiding Crack

Ground settlement on empty-mining area and water guiding crack have been found in the main production mines of the four state-owned Dongsun Coal Mine, Donghuai Coal Mine, Nahuai Coal Mines of Baise city and Gonglou Coal Mine. The settlement and water guiding cracks cause by illegal exploitation of several private kilns nearby have been backfilled and compacted for almost 10 years that influence on coal production have been removed, and without any hydropower relation with the reservoir water.

Most mine entrances of the existing 26 township and village coal mines and private coal mine distribute around outcrop area of coal bed, burying depth of empty-mining area is usually 30-10m, thickness of rock coal column laying over some empty-mining area is lower than the maximum height of water guiding crack of carving zone, therefore, ground

36 settlement or water guiding crack appear frequently. As mudstone over coal bed is good water isolation layer, after sinking by exploitation, the mudstone is expanded, intenerated by water until it become waxiness or plasticity so that it can fill crack gap falling and collapsing at empty-mining area in a short time (usually 1-2 years). For sinking or cracks caused by small coal kilns exploited in shallow layer, only after one raining season, raining water can rush the surface earth to the sinking area or cracks that no water leakage will be occurred in these cracks in the sinking area. Long-term exploitation practice have proved that water surging quantity of mine pit in coal mine have no obvious relations with increasing or decreasing of surface water in raining season, and even in mines which have sinking or cracks, water surging didn't increase rapidly. In addition, distance from ground sinking and water guiding cracks to the banks of reservoir are far and without any direct hydropower relations with the reservoir water.

To sum up, generally reservoir water will not fill the mine pit through water guiding cracks of sinking belt of empty-mining area after water storage.

VII. Reservoir Water Filling into Mine Pit through Hardpan of River Valley Terrace

The Youjiang River is eroding datum plane of the reservoir area, in normal condition, groundwater in hardpan of Youjiang river valley terrace along the banks drain to the Youjiang River. After water storage of the reservoir, the increasing of Youjiang River water level will cause increasing of underground water in hardpan of river valley terrace; but increasing or decreasing of groundwater level is not governing factor of groundwater filling into the mine pit, as mining system of coal mines is distributed in lower terrane of hardpan, there are no distribution of hardpan around the mine entrance, therefore groundwater of hardpan filling into the mine pit or not and filling quantity depend on bysmalith height and water penetrating between mining pit and hardpan. As stated above, lithology of mining pit top plate of the existing 61 state-owned and private coal mine within the reservoir area are all mudstone with silty sand rock and fine sand rock, among which mudstone is relative water insolated layer which cut off the relations between mine pit and ground water of hardpan; in addition, most mine entrances are located at outcrop of the third system stratum without hardpan nearby; some mine entrances of Baifeng and Napo diggings are located at valley terrace and pit shaft go through the hardpan, but this section of hardpan are usually adopted concrete breast wall with good waterproof feature, therefore, groundwater of hardpan is not the main water resources of the mine pit. This shows that in despite of water level of hardpan groundwater increased by water storage of the reservoir, it only has little influence on water filling of the mine pit.

VIII. Influence of Fault

The fault within the exploitation area of the existing four state-owned coal mines is not well developed, in Gonglou Coal Mine only Fl1 fualt are founded with length of 27km and fault distance of 80m. According to the coal exploration data, in the bore which controlled this fault, close-grained abrasion marks and slip plane are only found in drill 37 core closed to the fault and no other marks show that terrane are destroyed by the fault. Simple hydrology geology observation of bore shows that during drilling into the fault no water leakage and water surging occur in these bores and water level of bores are normal. While mining tunnels reveal the fault, no serious water surging occurs, and water seepage of sandstone near the fault is low without any obvious difference with other sections away from the fault. Therefore it shows that water containing and permeability are poor that will not cause serious water surging in the mine pits. The geological conditions of Dongsun Coal Mine, Donghuai Coal Mine and Nahuai Coal Mine of Baise city are similar with Gonglou Coal Mine that fault have no serious influence on water surging in the mine pit.

According to data collected at present and field investigation, there are no records of fault in exploitation area from all township and village coal mines and private coal mines, which shows that these coal mines are usually exploit in the area where fault are not developed and influence of fault on mining is slight.

38 Chapter 4 Relationship Between the Planned Coalmine and the Reservoir

The planned coal mine near Reservoir include Dawan Coal Mine, Dahe Coal Mine and Shuibu Coal mine, among which, Dawan Coal Mine is far from Youjiang River bank with boundary over 1000m from the bank, ground elevation over 120m and without any waterpower relation with the reservoir. Dahe Coal Mine is located at upstream 15km of the main dam of reservoir, which is similar to Gonglou Coal Mine at geological structure, lithology of coal stratum, hydrogeology and etc. As the planned exploiting boundary of Dahe Coal Mine is away from the riverbanks, coal mining will not affect safety operation of the reservoir and also water storage of reservoir influences little on the coal mining. Shuibu Coal Mine is also similar to existing state-owned coal mine of reservoir at geological structure, lithology of coal stratum, hydrogeology and etc. As the planned boundary of Shuibu Coal Mine is around the main dam of reservoir, which is more complicated than the existing state-owned coal mine, it is suggested that coal excavation shall be forbidden 1000m within the main dam to insure the safety of the dam. At area 1000m away from the dam, the size of waterproof coal bysmalith excavated on Youjiang riverbank shall be 110m and for section that total thickness of coal bed over 4.1m, the size of waterproof coal bysmalith shall be increased properly. And relevant provisions of Coal Industry Design Specification shall be followed strictly.

39 Chapter 5 Coal Resources under Reservoir Area

To insure safety operation of the reservoir in the future and safety mining along the banks of the reservoir, it is proposed by this report that waterproof coal bysmalith exploited at coal mine along the banks of the reservoir shall be over or equal to 1 Om and any mining within 250m of the main dam are forbidden.

According to the above principles and combining coal resource distribution of reservoir area and mining situation with general analysis and calculation, the main dam and banks of reservoir area will mainly lay over coal resources such as Tianyang prospecting area of Baise Coal Mine, Dahe prospecting area of Baise city and so on about 1,730,000 ton; in which, Tianyang prospecting area of 380,000 tons, Dahe prospecting area 800,000 tons, Gonglou Coal Mine, Yuejin mine and Dongsun coal mine along the banks 550,000 tons.

Resources near the banks of other prospecting area close to the reservoir area such as Napo prospecting area of Tianyang county and Dongsun prospecting area of Dongsun Coal Mine have been finished mining basically; and actual reserves near the banks of Dawan prospecting area and No.1 and No.2 mine of Donghuai coal mine are quite little, therefore, reserves of the above coal mines which have been covered by the Reservoir area will not be calculated.

It shall be stressed that the reservoir is of riverbed type, normal water storage level of 115m will not exceed the first level terrace of the banks of main riverbed after water storage, that is to say water of reservoir will not exceed the riverbed. Therefore, there's no too much change on the whole for coal mine being laid over by the reservoir area before and after water storage of reservoir area. At present the reserves of coal mine under reservoir area is due to nature condition of Youjiang River before water storage instead of water storage of the reservoir.

To sum up, construction of the project lay over a little reserves of coal mine along the banks of reservoir area that only cause little losing of coal resources and influence slightly on the above coal mines as a whole, therefore, construction of the project will not cause any negative influence on the national economy.

40 Chapter 6 Conclusions and Suggestions a. Stratums of reservoir area can be divided into four kinds of water containing rock fabric: incompact rock hole water containing rock fabric, half concretion mudstone silty sand mudstone silty sand rock relative water insulation rock fabric, half concretion silty sand fine sand rock mudstone hole cranny water containing rock fabric, clasolite cranny water containing rock fabric and carbonate cranny water-eroded cave water containing rock fabric. Among which, half concretion mudstone silty sand mudstone silty sand rock relative water insulation rock fabric and half concretion silty sand fine sand rock mudstone hole cranny water containing rock fabric that are indigent of rich water have close connections with coal mining of the reservoir area, and carbonate cranny water-eroded cave water containing rock fabric that are middle of rich water has no influence on coal mining at the reservoir area. b. In general the existing state-owned coal mines do not communicate with town and township enterprises and private mines; for some neighboring mines of town and township mine enterprises or private mines at the same diggings, some mines communicate with each other but all of which have water insulation terrain over 200m with the banks of the reservoir, therefore, the problem that water of the reservoir pouring into tunnels of the mines will not occur. c. The type of Naji Reservoir is riverbed reservoir, normal water storage level of 115m will not exceed the first level terrace of the banks of main riverbed after water storage, that is to say water of reservoir will not exceed the riverbed. Therefore, there is not too much change on the whole for coal mine being laid over by the reservoir area before and after water storage of reservoir area. At present the reserves of coal mine under reservoir area is due to nature condition of Youjiang River before water storage instead of water storage of the reservoir. In the future, the total coal reserves which have been laid over by the banks of reservoir area and within safety distance of the main dam is about 1.73 million ton. d. The existing coal mine of the reservoir area have no hydropower relation with Youjiang River and no underground water-eroded caves and underground rivers are founded in all stratums of diggings, therefore, there will be no water leakage problem of the reservoir. The existing exploitation area is far from the main dam of reservoir so that the exploitation of coal mine will not influence construction of the main dam and safety operation of the reservoir in the future. e. All the original state-owned and private coal mines in the reservoir area are 61, four of which are state-owned mines (mainly are Dongsun Coal Mine, Gonglou Coal Mine, Nahuai Coal Mine of Baise city, Donghuai Coal Mine and etc.), 57 of which are private coal mines. From 2000 up to now, private coal mines have stop production to rectify and improve according to the state policies and regulations. At present only 26 coal mines such as Napo Coal Mine within the reservoir area, which have passed acceptance of

41 relevant government departments, are approved to continue exploitation; the rest 31 private coal mine and 40 illegal exploiting and abandoned private kilns and coal mines have been closed and stopped up due to unqualified for safety production or resources have been dried up, therefore, there are no any influence on the construction and water storage of the reservoir. f. After water storage of the reservoir, the existing 4 state-owned coal mines and 26 private coal mines can meet the requirements of safety operation of the reservoir and safety production of coal mines in the future in the matter of reservoir water leakage, safety distance of coal exploitation, mining underwater, water filling of the fourth system hardpan connecting mining pit and water guiding cracks of empty-mining area settlement zone, submerging of mine entrance and ground of exploitation area, faultage influence and etc., except that Weiwuba Coal Mine, Huangjianming Coal Mine, Huangjiafa Coal mine, Ludeming Coal Mine and Huangshaocheng Coal Mine in Dahe diggings of Baise city cannot meet the requirements of safety production of coal mine in the matter of safety exploitation distance or elevation of mine entrance. After water storage of the reservoir, increasing of water level of the Youjiang River will not influence production of the above coal mines. g. Among the existing 26 private coal mines which is still in production, the following problems have been found by investigation that the minimum distance from empty-mining area of Huangjianming Mine and Huangjiafa mine to the banks of Youjiang Reservoir are 35m and 39m separately and the minimum burying depth are 20m and 30m; the proposed exploitation boundary of Weiwuba Mine is lO5m from the banks of Youjiang Reservoir and the minimum distance of empty-mining area from the banks is 160m; as elevation of Ludeming Mine (including main shaft and auxiliary shaft) is 114.2m which is lower than normal water storage level of 115m and entrance of Huangshaocheng Mine is 121m but communicates with Ludeming Mine, this two mines will be both flooded. For the above five mines, the proposed exploitation boundary, distance from empty-mining area to the banks less than lOim after water storage or elevation of mine entrance lower than normal water storage level of 115m that cannot meet the requirements of the Safety Production Law of China; among which, time limit of exploitation of 4 mines are within 3 years and the water storage time of the project is in January 2007, and according to relevant items of Guangxi Minerals Resources Management Regulations, the longest period of validity for mine exploitation permit are 3 years and the above 4 mines will be closed and blocked up according to the law before water storage; Weiwuba Mine will also be redefined exploitation boundary according to safety distance of mining of llOm. Therefore, the above 5 mines will not influence water storage of the reservoir. h. As rich coal resources are around the main dam and banks of the reservoir, to insure safety operation of the reservoir and normal production of coal mines, it's suggested that any mining 250m from the main dam, lOim around the banks or within 120m upstream the Youjiang Riverbed are forbidden according to the law.

42 List of Attached Drawings

No. Drawing Name 1 Drawing 4-1 Contrast Drawing Between Situations Above and Inside Well

______of Li Mengxu Coal Mine of Nabi Township 2 Drawing 5-1 Contrast Drawing Between Situations Above and Inside Well 2of Li Yuju Coal Mine of Nabi Township Drawing 6-1 Contrast Drawing Between Situations Above and Inside Well of Chen Boyu Coal Mine of Donghuai Mining Field In Baise 4 Drawing 6-2 Contrast Drawing Between Situations Above and Inside Well of Baise Dong'an Coal Mine of Leixing Mining Co. Ltd 5 Drawing 7-1 Contrast Drawing Between Situations Above and Inside Well of Lu Enrong Coal Mine of Nabi Township 6 Drawing 8-1 Contrast Drawing Between Situations Above and Inside Well of Liaoding Coal Mine of Nabi Township 7 Drawing 9-1 Contrast Drawing Between Situations Above and Inside Well of Lu Dehai Coal Mine of Nabi Township Drawing 10-1 Contrast Drawing Between Situations Above and Inside C 8 Coal Well of Nahuai Coal Mine of Baise Drawing 11-1 Contrast Drawing Between Situations Above and Inside Well of Qin Wenli Coal Mine of Baise 10 Drawing 12-1 Contrast Drawing Between Situations Above and Inside Well of Dong Huaicun Coal Mine of Nabi Township 11 Drawing 13-1 Contrast Drawing Between Situations Above and Inside Well of Huang Wei Coal Mine of Nabi Township 12 Drawing 13-2 Exploration Plan Drawing of Huang Wei Coal Mine in Nabi Township of Baise 13 Drawing 14-1 Contrast Drawing Between Situations Above and Inside Well of Wei Wuba Coal Mine of Nabi Township 14 Drawing 15-1 Contrast Drawing Between Situations Above and Inside Well of Huang Jiagui Coal Mine of Nabi Township 15 Drawing 16-1 Contrast Drawing Between Situations Above and Inside Well of Lan Jianfu Coal Mine of Nabi Township 16 Drawing 17-1 Contrast Drawing Between Situations Above and Inside Well of Huang Jianming Coal Mine of Nabi Township 17 Drawing 18-1 Contrast Drawing Between Situations Above and Inside Well of Huang Jiafa Coal Mine of Nabi Township 18 Drawing 19-1 Contrast Drawing Between Situations Above and Inside Well of Li Hequn Coal Mine of Nabi Township 19 Drawing 19-2 Exploration Plan Drawing of Li Hequn Coal Mine in Nabi Township of Baise 20 Drawing 20-1 Contrast Drawing Between Situations Above and Inside Well of Huang Shihe Coal Mine of Nabi Township

43 No. Drawing Name 21 Drawing 20-2 Exploration Plan Drawing of Huang Shihe Coal Mine in Nabi Township of Baise 22 Drawing 21-1 Contrast Drawing Between Situations Above and Inside Well of Ma Yuening Coal Mine of Nabi Township 23 Drawing 21-2 Exploration Plan Drawing of Ma Yuening Coal Mine in Nabi Township of Baise 24 Drawing 22-1 Contrast Drawing Between Situations Above and Inside Well of Huang Bingwei Coal Mine of Nabi Township 25 Drawing 22-2 Exploration Plan Drawing of Huang Bingwei Coal Mine in Nabi Township of Baise 26 Drawing 23-1 Contrast Drawing Between Situations Above and Inside Well of Huang Shaocheng Coal Mine of Nabi Township 27 Drawing 24-1 Contrast Drawing Between Situations Above and Inside Well of Lu Deming Coal Mine of Nabi Township 28 Drawing 25-1 Contrast Drawing Between Situations Above and Inside Well of Li Renchao Coal Mine of Nabi Township 29 Drawing 26-1 Contrast Drawing Between Situations Above and Inside Well of Huang Liangfei Coal Mine in Nabi Township of Baise City 30 Drawing 26-2 Exploration Plan Drawing for Huang Liangfei Coal Mine in Nabi Township of Baise City 3 1 Drawing 27-1 Contrast Drawing Between Situations Above and Inside Well of Luo Yangsheng Coal Mine in Nabi Township of Baise City 32 Drawing 27-2 Exploration Plan Drawing for Luo Yangsheng Coal Mine in Nabi Township of Baise City 33 Drawing 28-1 Contrast Drawing Between Situations Above and Inside Well of Wei Shanfang Coal Mine in Nabi Township of Baise 34 Drawing 29-1 Contrast Drawing Between Situations Above and Inside Well of Huang Zhongming Coal Mine in Nabi Township of Baise 35 Drawing 30-1 Contrast Drawing Between Situations Above and Inside Well of Huang Rideng Coal Mine in Nabi Township of Baise 36 Drawing 30-2 Exploration Plan Drawing for Huang Rideng Coal Mine in Nabi Township of Baise City 37 Drawing 31-1 Contrast Drawing Between Situations Above and Inside Well of Liupeng Coal Mine in Baifeng Township of Tianyang 38 Drawing 31-2 Exploration Plan Drawing for Liupeng Coal Mine in Baifeng Township of Tianyang 39 Drawing 32-1 Contrast Drawing Between Situations Above and Inside Well of Guangxi Gonglou Coal Mine 40 Drawing 32-2 Exploration Plan Drawing for Yuejin Coal Mine of Youjiang Bureau of Mines 41 Drawing 33-2 Exploration Plan Drawing for Shaohui Coal Mine of Baifeng Township in Tianyang

44 No. Drawing Name 42 Drawing 34-1 Contrast Drawing Between Situations Above and Inside Well of Luo'an Coal Mine in Baifeng Township of Tianyang County 43 Drawing 34-2 Exploration Mode and Mining Area Location of Luo'an Coal Mine in Baifeng Township 44 Drawing 35-1 Contrast Drawing Between Situations Above and Inside Well of Changsheng Coal Mine in Baifeng Township of Tianyang County 45 Drawing 35-2 Exploration Mode of Changsheng Coal Mine in Baifeng Township 46 Drawing 36-1 Contrast Drawing Between Situations Above and Inside Well of Guishang Coal Mine in Baifeng Township of Tianyang County 47 Drawing 36-2 Exploration Mode and Mining Area Location of Guishang Coal Mine in Baifeng Township 48 Drawing 37-1 Contrast Drawing Between Situations Above and Inside Well of Xinwen Coal Mine in Baifeng Township of Tianyang County 49 Drawing 37-2 Exploration Mode and Tunnel Layout of Xinwen Coal Mine in Baifeng Township

50 Drawing 38-1 Contrast Drawing Between Situations Above and Inside Well of Huangqian Coal Mine in Baifeng Township of Tianyang County

5 1 Drawing 38-2 Exploration Mode and Mining Area Location of Huangqiang Coal Mine in Baifeng Township 52 Drawing 39-1 Contrast Drawing Between Situations Above and Inside Well of Shunguang Coal Mine in Baifeng Township of Tianyang County 53 Drawing 39-2 Exploration Plan Drawing of Shuiguang Coal Mine in Baifeng Township 54 Drawing 40-1 Contrast Drawing Between Situations Above and Inside the Well of Nong Youqi Coal Mine in Sitang Town of Baise 55 Drawing 40-2 Exploitation Plan Drawing for Nongyouqi Coal Mine of Sitang Town of Baise Drawing 41-1 Contrast Drawing 56 Between Situations Above and Inside the Well of Haijun Coal Mine in Baifeng Township 57 Drawing 41-2 Exploitation Plan Drawing for Haijun Coal Mine of Baifeng Township Drawing 42-1 Contrast Drawing Between Situations Above and Inside 58 the Well of No. 1 Coal Mine of Napo Town 59 Drawing 43-1 Contrast Drawing Between Top and Bottom of Well in Jinghong Coal Mine of Napo Town 60 Drawing 43-2 Exploration Mode and Mining Area Layout of Jinghong Coal Mine of Napo Town 61 Drawing 44-1 Contrast Drawing Between Top and Bottom of Well in No.5 Coal Mine of Napo Town Drawing 44-2 Exploration Mode and Mining Area Layout of No.5 Coal 62 Mine of Napo Town

45 No. Drawing Name Drawing 45-1 Contrast Drawing Between Top and Bottom of Well in 63 Yutao Coal Mine of Napo Town 64 Drawing 45-2 Exploration Mode and Tunnel Layout in Yuyao Coal Mine in Napo Town 65 Drawing 46-1 Contrast Drawing Between Top and Bottom of Well in No. 7 Coal Mine in Napo Town 66 Drawing 46-2 Exploration Mode and No.1 Mining Area Layout in No.7 Coal Mine in Napo Town 67 Drawing 47-2 Plan of Exploration in Minghua Coal Mine in Napo Town Drawing 48-1 Contrast Drawing Between Top and Bottom of Well in Wu'an 68 Coal Mine of Napo Town 69 Drawing 48-2 Plan Drawing of Exploration in Wu'an Coal Mine of Napo Town 70 Drawing 49-1 Contrast Drawing Between Top and Bottom of Well in Lanqiu Coal Mine in Napo Town of Tianyang County Drawing 49-2 Exploration Mode and Tunnel Layout in Lanqiu Coal Mine 71 in Napo Town 72 Drawing 50-1 Contrast Drawing Between Top and Bottom of Well in No.2 Coal Mine in Natuo Village of Tianyang 73 Drawing 50-2 Exploration Plan Drawing for Natuo No.2 Coal Mine of Tianyang 74 Drawing 51-1 Contrast Drawing Between Situations Above and Inside Well of Zhongqiang Coal Mine in Napo Town 75 Drawing 51-2 Exploration Plan Drawing for Zhongqiang Coal Mine of Napo Town in Tianyang 76 Drawing 52-1 Contrast Drawing Between Situations Above and Inside Well of Bingzheng Coal Mine in Natuo 77 Drawing 52-2 Exploration Plan Drawing for Bingzheng Coal Mine of Natuo in Tianyang Drawing 53-1 Contrast Drawing Between Situations Above and Inside 78 Well of Shaolin Coal Mine in Napo Town, Tianyang County 79 Drawing 53-2 Exploration Plan Drawing for Shaolin Coal Mine of Napo Town 80 Drawing 54-1 Contrast Drawing Between Situations Above and Inside Well of Nahuai Coal Mine in Napo Town, Tianyang County 81 Drawing 54-2 Exploration Mode in Nahuai Coal Mine in Napo Town Drawing 55-1 Contrast Drawing Between Upper and Below Wells of Coal Mines in 82 Napo Town, Tianyang County 83 Drawing 55-2 Exploration Mode and Mining Area Layout of Napo Coal Mine 84 Drawing 56-1 Contrast Drawing Between Situations Above and Inside the Well of Runsen Coal Mine in Napo Town 85 Drawing 56-2 Exploration Mode and Tunnel Layout of Runsen Coal Mine of Napo Town Drawing 57-1 Contrast Drawing Between Situations Above and Inside the Well of 86 Natuo No.3 Coal Mine in Napo Town

46 No. Drawing Name Drawing 57-2 Exploration Mode and Tunnel Layout of Natuo No.3 Coal 87 Mine of Napo Town 88 Drawing 58-1 Contrast Drawing Between Situations Above and Inside the Well of Jianyang Coal Mine in Napo Town 89 Drawing 58-2 Exploration Mode and Mining Area Layout of Jianyang Coal Mine of Napo Town 90 Drawing 59-1 Contrast Drawing Between Situations Above and Inside the Well of Xinmin Coal Mine in Napo Town 91 Drawing 59-2 Exploration Mode and -Mining Area Layout of Xinmin Coal Mine of Napo Town 92 Drawing 60-1 Contrast Drawing Between Top and Bottom of Well in Daweiling Coal Mine of Napo Town 93 Drawing 60-2 Exploitation Plan Drawing for Daweiling Coal Mine of Napo Town 94 Drawing 61-1 Contrast Drawing Between Situations Above and Inside the Well of Zhengli Coal Mine in Napo Town 95 Drawing 61-2 Exploration Mode and Mining Area Layout and Machine Provision of Zhengli Coal Mine of Napo Town

47 Annex I

Guangxi Zhuang Autonomous Region's

Baise Prefectural Government Office

Date: October 21, 2001 To: Government of relevant counties, autonomous counties, and cities, and relevant departments Subject: A Notification of Carrying out GZF [2001] No.79 Document about Farther Work of Closing and Rectifying Small Coal Mines and Safety Production of Coal Mines from Baise Prefectural Government Office Doc. No.: BaiShuFa [2001] No.57

Now the Notification of Carrying out GBF [2001] No.68 Document about Farther Work of Closing and Rectifying Small Coal Mines and Safety Production of Coal Mines from Guangxi Zhuang Autonomous Region's Government (GZF [2001] No. 79) is transmitted to the above government and departments, please follow and carry out strictly.

To further carry out closing and rectifying work of small coal mines and safety production of coal mines in Baise Prefecture and realize essential improvement of safety production of coal mine, the government and departments of relevant counties and cities shall implement closing and rectifying work of small coal mines and safety production of coal mines within area as follow:

1. The GZF [2001] No.79 Document from Guangxi Zhuang Autonomous Region's Government shall be implemented and carried out strictly. Primary leaders of government of relevant counties, cities and departments shall hold special meetings immediately to study and comprehend the notification about farther work of closing and rectifying small coal mines and safety production of coal mines so as to unify thought and understanding, combine with the actual situation of local region and implement the requirements of the document by one hundred percent.

2. Strictly following the requirements of GBF [2001] No.68 document and BBF [2001] No. 122 and [2001] No. 123 documents to implement Closing under Four Conditions by one hundred percent. The closing work of mines according to Closing under Four Conditions shall be finished before the end of October 2001 to insure the rectifying work of small coal mines have been finished roundly. For mines which have been close according to Closing Under Four Conditions, every counties and cities shall issue proclamation immediately, the minerals management department shall cancel or withdraw their mining permits and bomb out shafts and replant surface vegetation to prevent illegal production of the coal mines. Coal mines which have been closed but

48 product again without any permissions shall be investigate accordingly as exploitation without permits and find out the responsibilities of direct persons and principal of local government; if commit a crime, relevant persons shall be transferred to judicial authorities to investigate criminal responsibility.

3. Implementing the clearing work of certificates and permits of small coal mines which have been closed. Every county and city rich of coal mine shall clear up all certificates and permits issued formerly during the closing and rectifying period of small coal mine. All certificates and permits belong to the small mines which have been closed according to Closing under Four Conditions shall be cancelled or withdrawn by relevant departments by the end of October 2001. For small coal mines which have stop production for rectifying, relevant certificates and permits shall be cancelled or withdrawn by the end of 2001 and closed according to the law in case they can not meet the basic requirements of safety production after rectifying and improving.

4. Inspecting and rectifying shall be strictly carried out in accordance to Special Renovating and Acceptance Enforcement Measures for Safety Production of Small Coal Mine from Guangxi Zhuang Autonomous Region's Government, and Special Renovating and Acceptance Standard for Safety Production of Guangxi Zhuang Autonomous Region. Coal mines which are not belong to Closing under Four Conditions shall be rectified immediately from now on. Coal mines which can not meet the requirements after rectifying or cannot reach the standard at all by this year shall be closed according to the law.

5. Strengthening leadership, making responsibility clear and definite and paying close attention to implementation. Government and relevant departments of every counties and cities shall list the work of closing and rectifying small coal mine as important schedule and strengthen the leadership and carry out responsibility for every level. Every county and city rich of coal shall set up leading group for closing work of small coal mine immediately, work out implementation measures in accordance with the actual conditions and take the responsibility of implementation. Prearrangement for accidental events during the closing and rectifying of small coal mine shall be worked out to insure stabilities of the society.

6. Strengthening supervision and inspection. Baise Prefectural Government Office will organize inspection group in the near future for closing and rectifying small coal mine to go to every county and city to inspect and supervise implementing situations of GZF[2001] No.79 document from Guangxi Zhuang Autonomous Region's Government, so as to prepare for the inspection from the Guangxi Zhuang Autononous Region's Government.

49 Annex 2

Guangxi Zhuang Autonomous Region's

Baise Prefectural Government Office

Date: September 1, 2002 To: Government of Baise city, Tianyang county, Tiandong county and relevant departments Subject: A Notification of Passing Prefectural Inspection and Acceptance List of 27 Township and Village Small Coal Mines such as Weiqiulan Coal Mine from Baise Prefectural Government Office Doc. No.: BaiShuFa [2002] No.45

According to Notification of Farther Work of Closing and Rectifying Small Coal Mines and Safety Production of Coal Mines from General Office of the State Department (GBF [2001] No.68 document and Notification of Special Renovating and Acceptance Enforcement Measures for Safety Production of Small Coal Mine from Guangxi Zhuang Autonomous Region's Government (GZBF[2001] No.187), and requirements of the regional meeting which has been hold on May 16 2002 for closing and rectifying small coal mines, Baise Prefectural Government Office organized acceptance from July 1 to 15 for the township and village small coal mines which have been passed acceptance of county and city level and apply for prefectural acceptance. The results of acceptance are as follow:

Currently 36 Township and village small coal mines have passed acceptance of county and city level and apply for prefectural acceptance (among which 18 of Baise city and 18 of Tianyang county). According to Special Renovating and Acceptance Standard for Safety Production of Guangxi Zhuang Autonomous Region, the Acceptance Group inspected over all for five production systems as ventilation, power supply, drainage, transport and lifting of every mine, and regarded that 27 coal mines have basically meet the acceptance standard at present (among which 15 of Baise and 12 of Tianyang). Baise Prefectural Government Office have submitted the acceptance report of 27 coal mints to the Guangxi Zhuang Autonomous Region's Government and applied for acceptance. To further carry out the work of closing and rectifying small coal mines and safety production of coal mines, the following issues shall be followed:

1. For township and village small coal mines which have passed prefectural acceptance, relevant departments of every county and city shall continue to strengthen supervision and management, support and instruct the rectifying, improving and maintenance of the coal mines. At the mean time, rush production by owners of small coal mines and return to production secretly shall be strictly prohibited, which will be treated after acceptance and approving by the Guangxi Zhuang Autonomous Region.

50 2. For small coal mines which didn't supply for prefectural acceptance within the fixed time or couldn't pass prefectural acceptance, relevant departments of every county and city shall close these coal mines and go through formalities of closing in accordance with relevant regulations of GBF [2001] No.68 document and GZBF[2002] No.187 document.

Attachment: List of Township and Village Small Coal Mines in Baise Prefecture that have passed Prefectural Acceptance

Name of the Coalmine Address Corporate Representative Yutao Coalmine, Napo Town, Tianyang Natuo Village, Napo Town, Huang Chengzhen County Tianyang County Xinwen Coalmine, Beifeng Township, Baifeng Village, Baifeng Huang Xinwen Tianyang County Township, Tianyang County Luoan Coalmine, Baifeng Township, Baifeng Village, Baifeng Luo An Tianyang County Township, Tianyang County Guishan Coalmine, Baifeng Township, Baifeng Village, Baifeng Huang Guishan Tianyang County Township, Tianyang County The Fifth Coalmine, Natuo, Napo Town, Nalong Village, Napo Su Mingxian Tianyang County Town, Tianyang County Changsheng Coalmine, Baifeng Baifeng Village, Baifeng Gan Hebei Township, Tianyang County Township, Tianyang County Nahuai Coalmine, Napo Town, Tianyang Wanping Village, Napo Huang Bingxin County Town, Tianyang County The Seventh Coalmine, Natuo, Napo Natuo Village, Napo Town, Chen Tianming Town, Tianyang County Tianyang County The Third Coalmine, Napo Town, Natuo Village, Napo Town, Liang Hui Tianyang County Tianyang County Napo Town Coalmine, Tianyang County Natuo Village, Napo Town, Luo Sejun Tianyang County Lanqiu Coalmine, Napo Town, Tianyang Natuo Village, Napo Town, Wei Lanqiu County Tianyang County Runsen Coalmine, Napo Town, Tianyang Wanping Village, Napo Huang Runsen County Town, Tianyang County Qinwenli Coalmine, Donghuai Village, Donghuai Village, Nabi Qin Wenli Nabi Township, Baise City Township, Baise City Huangjiayou Coalmine, Nabi Township, Jiexiang Group, Dahe Huang Jiayou Baise City Village, Nabi Township, Baise City Limengxun Coalmine, Nabi Township, Nabi Village, Nabi Li Mengxu Baise City Township, Baise City

51 Name of the Coalmine Address Corporate Representative Liaodingdu Coalmine, Nabi Township, Donghuai Village, Nabi Liao Dingdu Baise City Township, Baise City Huangjianming Coalmine, Nabi Jiexiang Group, Dahe Huang Jianming Township, Baise City Village, Nabi Township, Baise City Huangshaocheng Coalmine, Nabi Dahe Village, Nabi Huang Shaocheng Township, Baise City Township, Baise City Huangzuen Coalmine, Yongle Township, Yongle Township, Baise Huang Zuen Baise City City Huangbingwei Coalmine, Dahe Village, Dahe Village, Nabi Huang Bingchuan Nabi Township, Baise City Township, Baise City Lirenchao Coalmine, Nabi Township, Dahe Village, Nabi Li Renchao Baise City Township, Baise City Weishanfang Coalmine, Nabi Township, Dahe Village, Nabi Wei Shanfang Baise City Township, Baise City Ludeming Coalmine, Dahe Village, Nabi Dahe Village, Nabi Lu Deming Township, Baise City Township, Baise City Enrong Coalmine, Donghuai Village, Dahe Village, Nabi Lu Enrong Nabi Township, Baise City Township, Baise City Huangjiangui Coalmine, Dahe Village, Donghuai Village, Nabi Huang Jiangui Nabi Township, Baise City Township, Baise City Weiwuba Coalmine, Nabi Township, Jiexiang Group, Dahe Wei Wuba Baise City Village, Nabi Township, Baise City Lanjianfu Coalmine, Nabi Township, Dahe Village, Nabi Lan Jianfu Baise City Township, Baise City

52 Annex 3

Guangxi Zhuang Autonomous Region's

Baise Prefectural Government Office

Date: July 23, 2003 To: Guangxi Xijiang Waterway Construction and Development Co. Ltd. Subject: Answer to Letter of Closing Coalmines Along Banks of the Reservoir Areas of Naji Navigation Complex of Guangxi Youjiang Navigation Construction Project Doc. No.: BSF [2003] No.99

Your Letter of Closing Coalmines Along Banks of the Reservoir Areas of Naji Navigation Complex of Guangxi Youjiang Navigation Construction Project (No.: XiJiangNaJi[2003]95) has been received. It is hereby answered as the following:

1. We agree that since July 20, 2003, new coal exploitation certificate will not be issued within the limit of the safety distance to the reservoir area, that is, 110m from both banks of Youjiang River, 250m from Naji Dam Site and 120m lower from the water body of Youjiang River.

2. It is not permitted to continuing the production within the limit of safety distance for the coalmines not passing the acceptance, excluding the 27 individual coalmines passing the acceptance as mentioned in the document No.BaiShuFa[2002]45, A Notification of Passing Prefectural Inspection and Acceptance List of 27 Township and Village Small Coal Mines such as Weiqiulan Coal Mine from Baise Prefectural Government Office.

3. We agree that by January of 2007 when the reservoir will store water, the four coalmines situated in Dahe Coal Field of Baise City, including Huangjianming, Huang Jiafa, Lu Deming and Huang Shaocheng coalmines, which will have some influences on the safely operation of Naji Reservoir, will not be permitted to defer their exploitation term.

4. We agree that by December of 2003, the exploitation scope of Weiwuba Coalmine, which is situated in Dahe Coal Field of Baise City, replanned within the safety limit, that is, 110m out of the banks of the reservoir.

53 References

1. Geological Investigation Report of Naji Navigation Complex of Guangxi Youjiang Navigation Construction Project (for Dam Site Component), by Nanning Non-ferrous Metal Foundation Engineering Survey Institute, May of 2003

2. Geological Hazard Evaluation Report for Reservoir Area of Naji Navigation Complex of Guangxi Youjiang Navigation Construction Project, by Guangxi Geological Hazard Prevention Engineering Survey and Design Institute, October of 2002

3. Regional Hydrogeological Report by Scale of 1:200,000 of the People's Republic of China (for Baise Region), by Guangxi Hydrogeological Investigation Team, 1971

4. Geological Investigation Report of Tianyang County Prospect Area of Baise Coal Field of Guangxi Zhuang Autonomous Region, by the Section Geological Investigation Team of Guangxi, 1983

5. Geological Investigation Report of Napo Prospect Area of Baise Coal Field of Guangxi Zhuang Autonomous Region, by the Section Geological Investigation Team of Guangxi, 1983

6. Detailed Geological Investigation Report of Donghuai Prospect Area of Baise Coal Field of Guangxi Zhuang Autonomous Region, by No. 130 Geological Investigation Team of Geological Investigation Company under Guangxi Coal and Petroleum Industry Bureau, December of 1958

7. Detailed Geological Investigation Report of No. 3 and No. 4 Coalmines of Donghuai Prospect Area of Baise Coal Field of Guangxi Zhuang Autonomous Region, by No. 150 Coal Field Geological Investigation Team of Guangxi, November of 1986

8. Final General Geological Investigation Report of Dawan Prospect Area of Baise Coal Field of Guangxi Zhuang Autonomous Region, by Guangxi Coal Investigation Team, July of 1984

9. Detailed Geological Investigation Report of Tiandong Dongshun Prospect Area of Baise Coal Field of Guangxi Zhuang Autonomous Region, by No. 130 Geological Investigation Team of Geological Investigation Company under Guangxi Coal and Petroleum Industry Bureau, October of 1961

10. Final Detailed Geological Investigation Report of Dahe Prospect Area of Baise Coal Field of Guangxi Zhuang Autonomous Region, by No. 150 Coal Field Geological Investigation Team of Guangxi, December of 1984

11. General Geological Investigation Report of Gonglou Napo Prospect Area of Baise Coal Field of Guangxi Zhuang Autonomous Region, by No. 130 Geological Investigation Team of Geological Investigation Company under Guangxi Coal and Petroleum Industry Bureau, 1964

12. Related Information for 61 Coalmines in the Borders of Youjiang District of Baise City and Tianyang County, provided by Baise Land Resources Bureau, Tianyang Land Resources Bureau, etc. 54