GM 39061 REPORT ON THE WASWANIPI AREA GEOLOGICAL RECONNAISSANCE REPORT ON THE

WASWANIPI AREA GEOLOGIC;IL RECONNAISSANCE

QUEBEC - NTS 32F-9 and 32G-12

Ministère de !'nFrgiP et des Ressources Gouvernement du Québec Service du Potentiel minéral DATE: ~ E SEP. 1662 No G.M.: 33061

Jean Castonguay November, 1977 SUMMP RY

A reconnaissance mapping programme was carried out in August 1977 in the area of , north of Desmaraisville, in an attempt to identify a favourable volcanogenic massive sulfides environment. The map-area is mostly underlain by basic volcanics inter- stratified with sedimentary rocks and intruded by sill-like gabbro instrusives. Some horizons of intermediate to felsic flows and pyroclastics were found and geochemical results of total rock analysis revealed a possible calc-alkaline series within the belt. As this environment is believed to be favourable for volcanogenic massive sulfides, an INPUT survey is recommended to be flown over the area early in 1978. t. TABLE OF CONTENTS

SUMMARY INTRODUCTION 7LOCATION, ACCESS AND RESOURCES 3 LAND STATUS 4 PREVIOUS WORK 6

North half of Lesueur Township 7 Boyvinet Township 8 Gand Township 9 La RonciereToWn'ship 10

GEOLOGY 12 General Remarks 12 General Geology 12 Volcanic Rocks 12 Basic volcanics 12 Intermediate volcanics 13 Felsic volcanics 14 Sedimentary Rocks 14 Intrusive Rocks 15 Structure 16 GEOCHEMISTRY 17 MINERALIZATION 20 CONCLUSIONS 20 RECOMMENDATIONS 21

REFERENCES 22 1 LIST OF FIGURES

Page

Figure 1 Location map 2

Figure 2 Current Land Status 5

Figure 3 Assessment of Previous Work 11 Figure 4 AFM diagram 18 Figure 5 AFM diagrams 19

ANNEX: Rock Analysis 23

5'1

Ti INTRODUCTION

As a result of an assessment work compilation of the Bachelor Lake-Surprise Lake volcanosedimentary belt, the Waswanipi River area was selected for the 1977 Quebec Reconnaissance Programme on the basis of little or no detailed geological mapping, relatively limited base metal exploration and absence of known recent airborne geophysical surveys.

Following recommendations by D. McAuslan, geological reconnaissance mapping was carried out during the period extending from August 10 to August 21, 1977, mainly along road:3 and rivers with a few additional aircraft supported traverses, in an attempt to identify a favourable volcanogenic base metal environment.

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~ Figure 1: Location Map 3.

LOCATION, ACCESS AND RESOURCES

The centre of the Waswanipi area is located 245 Km north- east of Val D'Or and 125 Km west of along highway 113, (Senreterre-Chibougamau) just north and north-east of the small town of Desmaraisville. (Fig. 1). The study area covers about 700 square km.', bounded by latitudes 49°35' and 49°45' and longitudes 75°40' and 75°15'. Geological reconnaissance mapping was carried out in Boyvinet, Gand, and the west half of La Ronciere townships and part of Lesueur, Montalembert and Krieghoff townships.

The southern part of the region is of easy access as numerous lumber roads in La Ronciere, Gand and Boyvinet townships connect to a north-east, south-west section of the Senneterre-Chibougamau highway passing through the central portion of the area. Chibougamau and Waswanipi Rivers, as well as the highway give access to most of the north half of Boyvinet and Gand townships. Float plane is the most efficient mean. 'f access for the north-western portion of the area.

The town of Desmaraisville is well served by the Canadian National Railways and Hydro Quebec power lines. LAND STATUS

The north halves of Boyvinet and Gand townships are at the present time, withdrawn from staking as a result of a pending agree- ment between the James Bay Development Corporation and James Bay IndiF•ns, Some of the same land is also withdrawn from staking, below the 960' level (Waswanipi Reservoir), in anticipation of future flooding resulting from the James Bay hydroe]~ctric. developments.

However; according to the "Convention de la Baie James et du nord Quebecois", the Quebec Government still owns the mineral rights. Exploration and development work is allowed to be carried out with the consent of the Indians and according to the provincial regulations and laws.

Very little of the land within the area of interest is known to be staked at the present time.. Figure 2 shows the current land situation: ground withdrawn from staking and ground currently staked.

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GROUND W iTHDRAWr FROM STAkinlG ~

~ AGREEMENT S~B,J- iNDiANS

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. Figure 2: Current Lan.., Status PREVIOUS WORK

No recent geological mapping was done by the Q.D.N.R. in the area of interest except in ;Lesueur township. The geological maps available at the present time, at a scale of 1 mile to 1 inch; are the following:

MAP AREA AUTHOR REPORT M.N.R. -852 L. Bachelor (covering Lesueur and Lcngley, G-47, Boyvinet twp.) 1946

G.S.C.-556A Opawica Lake (covering Gand twp.) ShaW„ 1940 G.S.C.-555A Lewis Lake (covering La Ronciere twp.) Shaw, 1940

The east half of Lesueur township was mapped by the Q.D.N.R. in 1950 at a scale of 1:12,000 (J. Dugan, 1950, P.R. 612 revised and released in 19 75) and the northwest quarter of the same township was mapped at the same scale in 1967. by M. Van de Walle (P.R. 599).

A compilation of assessment data of the Bachelor Lake green- stone belt shows that most of the exploration done to date in the area has been concentrated in.. Lesueur, Lesperance and south half of Gand and La Ronciere townships, around known Cu-Zn deposits or showings and gold occurences (Coniagas Mine, Quebec Sturgeon Gold Mine, both in Lesueur township and Opawica Island Cu-Zn showing in Lesperance township). At least three AEM INPUT surveys are known to have been flown by Questor in the last few years (Mark V and VI INPUT surveys), the north boundary of which correspond to the south limit of our reconnaissance mapping (See Fig. 3 for location). Another AEM survey has probably been flown by Umex in the late 1960's covering the whole area as a few ground geophysical surveys with specific location and limited extension were reported all over the area of interest. A few diamond drill holes followed the Umex surveys. Within the 1977 reconnaissance area, relatively little exploration has been done. Refer to Figure 3 for location of the following assessment work. (Numbers on the map correspond to numbers in the text).

North half of Lesueur township (north & west of Bachelor Lake)

No important discoveries were made within this area. A few py-po mineralized zones are known but no interesting values were obtained. No base metal showings are kncwn. Two segments of an oxide iron formation were found just north and north-west of Billy Lake.

(1) Uranium King Corporation drilled 5 holes in 1954, two of them (B-4, B-5) north-east of Billy Lake and Bl, B2, B3 south of the same lake.

(2) Rio Tinto Exploration Limited (1955) drilled one hole that cut some agglomerates and tuffs. One foot of massive sulfides was inter- sected in addition to minor cpy, py, po, mag and 3 feet of graphite with pyrite.

(3) Quebec Bachelor Mining Corporation. (1957) drilled 4 holes (H-14 to H-17) in ranges VII intersecting agglomerates and tuffs, sedimentary rocks and shear zones with graphite and pyrite.

(4) McWatters Gold Mines Limited drilled 3 holes in 1958 'for a total of 1147 feet in range X.

(5) Chesbar Chibougamau Mines Limited (1961). A magnetic survey followed by 5 diamond drill holes (L1 to L5) in ranges IX and X resulted in locating two segments of an oxide iron formation, the east one being 7600 feet long and 350 feet wide, the other one being 8700 feet long and 200 feet wide. One hole in the east segment cut 344 feet carrying 19.34% Fe while in the west segment 216 feet averaged 21.5% Fe. 8.

(6) Tri-Ex Mines Limited (1966) drilled one hole to test an EM-Mag anomaly and intersected a graphitic zone with po mineralization.

Boyvinet Township

The township has probably been flown by Umex in the late 1960's and two other AEM surveys cover parts of it. A total of 26 diamond drill holes were filed in the assessment work. A few py-po sulfides inter- sections and occurences are reported but no base metal concentrations are known to exist.

(1) Rio Canadian Exploration drilled one hole in 1956 in the south central part of the township.

(2) American Metal Co. Limited drilled three holes (Q57-42 to 44) in 1957 intersecting graphite with py-po mineralization in sediments.

(3) Mineral Management Limited (1957). Four diamond drill holes, S-1 to S-4 along the east-west centre line.

(4) Ventures Limited, in 1958, flew an AEM survey and produced a detailed geological map covering the north-east corner of the township.

(5) Denison Mines Limited reported a helicopter EM survey flown in 1960 over the central portion of the township. No recognizable anomalies encountered. Six holes were drilled in 1961 just north of the east- west centre line; one of them intersected 4' of disseminated py-po in a tuff.

(6) Caesar Minerals Limited drilled two holes in 1960, one of which cnt disseminated pyrite in andesite.

(7) Sullico Mines Limited (1965). Four holes (B5-1 to B5-4) in the south- east corner of the township, in andesite, diorite and sediments, inter- sected graphitic tuff with py-cpy mineralization (best intersection: 20' x 0.17% Cu) .

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(8) Umex drilled five holes in 1968 of which no information is available. One hole (F-27) was drilled in 1969 in the south-west portion of the township intersecting graphitic schist with py-po mineralization in sediments.

Gand Township (north of the INPUT boundary)

Most of the exploration done to date in Gand is concentrated in the south central and south east portions of the township, just south of the Mark V and VI INPUT surveys boundary (out of the reconnaissance area). Several gold showings and Cu-Zn occurences are known, some of them associated with rhyolite and rhyolite tuffs.

(1) Gunnar Gold Mines Limited drilled 10 holes in 1951. No interesting intersections obtained.

(2) Ventures Limited flew in 1958 an airborne EM survey covering the north western corner of the township. Six (6) diamond drill holes (WS-1 to WS-6) followed in the same year. One of the holes inter- sected 5% of py mineralization in andesite and rhyolite while another one cut 5% py.mineral.ization associated with gabbro, rhyolite and rhyolite porphyry.

(3) Gibson Mines Limited (1959) drilled 16 short holes with no interesting intersections.

(4) Merrill Island Mining Co. Limiter flew an AEM survey in 1966 covering the east central portion of the township. Several weak questionable EM anomalies reported. Little ground follow up. No diamond drilling followed.

ry ~ 10.

La Ronciere Township (north of the INPUT boundary)

As it was the case in Gand township, all the exploration done in La Ronciere is concentrated in the south half of the township, around gold and copper showings or intersections associated with basic volcanics and rhyolite tuffs. No work was filed for that portion of the township north of the INPUT boundary. 71toPoSED SuRtift.Y:

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..(31,1t Li Mi TS Of iNIPUT Dqnuitai‘ivi , \ COVERAGE \ \ \\L, \ •• \ \ \ \ \ \ E LapP.k41'Jck. \ I \ \ CALE I: 250,000

Figure 3: Assessment of Previous Work 12.

GEOLOGY

General Remarks

The geological map provided at the end of this report is the result of a compilation of data gathered from government geological maps (see bibliography for details) and detailed geological maps filed by mining companies as well as ground geological information collected during our reconnaissance programme. The reconnaissance consisted mainly of road and shore line geology along numerous lumber roads and Waswanipi/Chibougama.0 Rivers.

General Geology

The density of outcrops is highly variable all over the study area and the rocks are particularly poorly exposed in the central part of Boyvinet and Gand townships, where glacial deposits cover most of the bed- rock. All the rock types underlying the area are Precambrian in age and part of an east-west trending Archean greenstone belt, extending from Bachelor Lake eastward to Surprise Lake. Several concordant gabbro/diorite sill-like intrusives occur within the belt which is bordered to the west and to the north by important granitic masses. A few granitic plutons of minor importance are observed within the greenstones. (See geological map in back pocket).

Volcanic Rocks

Basic volcanics (basalts, andesites): most of the volcanic rocks found in the area are basic in composition, either basaltic or andesite. They are typically dark green, chloritic, altered, commonly schistose rocks, of which different 13.

varieties can be observed. Well preserved pillowed basic flows are particularly common in the south-east corner of the study area, north- west of Lake Relique, where the rock is lighter in color and harder than usual. It is the only place where the shape of the pillows allows a proper determination of tops, toward the north, the formations being vertical or steeply dipping to the south. Elsewhere, the foliation often makes the pillows hardly recognizable. A massive to foliated, aphanitic to fine grained variety, dark green to pale greenish gray, is fairly common throughout the area, the light color rock. possibly being trachytic in composition. The schistosity can be in places strong enough to produce a chlorite schist. The massive and pillowed flows are commonly amygdaloidal. Porchyritic variety is rare'while tuffs and agglomerates of the same composition can be observed in different localities, particularly in that pyroclast;c ,iorizon extending from Cpawica River east- ward to Lewis Lake.

Intermediate volcanics: Much less common than the basic rocks, a few varieties of dacitic to rhyodacitic rocks were found within the area of interest. They are commonly tuffaceous and agglomeratic and the best horizon of these pyroclastic rocks extends from eastward to Lewis Lake. The tuff is fine to medium grained, light brown on weathered surface, light gray on fresh exposure, poorly banded and generally schistose. The agglomerate shows elongated, more or less angular, light coloured felsic fragments, averaging 3 to 5 cm in size, some of them as long as 20 to 30 cm. Most of the fragments are lighter in color than the matrix, which is a generally fine grained, sometimes schistose, dark green, tuffaceous material. Some of the fragments are more basic in composition and show a porphyritic texture. A few outcrops were found of a highly schistose, fine grained, generally sericitized rock, which is believed to be an altered intermediate to felsic tuff. These rocks appear to form thin bands interbedded with basic flows and other rock types.

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Feisic volcanics: Only one outcrop of rhyolite was found during the course of our reconnaissance on the north shore of Waswanipi river, just west of the Waswanipi Reservation. The rock is massive, aphanitic to fine grained, pinkish in colour and shows a concoidal fracture. A few thin bands of rhyolite and rhyolite tuff were reported in the assessment data in the central part of Boyvinet township and some diamond drill holes intersected rhyolite and rhyolite porphyry just north-west of the Waswanipi Reservation. A fine grained, highly siliceous, chert-like, finely laminated rock, mapped as a sedimentary rock, could, in part, be a felsic tuff where no definite sedimentary structure exist.

Sedimentary Rocks:

A band. of Temi;:,camians-Type sedimentary rocks was mapped by the Q.D.N.R. geologists in the south-western portion of the map area. It consists mainly of conglomerate arkoses and graywackes with some tuffs and phyllites. A magnetite iron formation associated with the arkosic rocks and the tuffs extends over a distance of at least 2 1/2 miles just north of Bachelor Lake.

Thin horizons of sediments interstratified with the volcanics were also mapped by government geologists and reported on various mining companies geological maps.

Some of the outcrops were visited during the course of our reconnaissance mapping. The rock is generally light to dark green in colour, fine grained, highly siliceous and has a chert-like appearance. Fine laminations are common and good sedimentary structures as cross-bedding and graded bedding can occasionally be observed. The composition and structure is variable, going from an impure quartzite to a quartz-biotite schist, being

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either massive or well laminated. If it is a definite sedimentary rock in some places, elsewhere, it could be mapped as a siliceous volcanic rich sediment or a cherty tuff.

Intrusive Rocks

Gabbro-diorite intrusives: Several sill-like metagabbro-metadiorite (qtz diorite) bodies intrude the volcanic pile in a general E-W and NE-SW direction. Generally massive, coarse grained, the gabbro often contains magnetite and show;: a strong magnetic signature on the aeromagnetic maps. Most of the south-east corner of Boyvinet seems to be underlain by gabbroic rocks, generally poorly exposed, and showing a complex structure. Meta- gabbro and metadiorite rocks are usually not differentiated on the map.

Granitic intrusives: The general composition of the younger intrusives surrounding the volcanic belt to the west, the north-west and the north- east is granitic. The rock can be a good granite as well as a syenite, a tonalite, etc. A porphyritic syenite rich in magnetite outcrops in ' the south-west corner of the map area.

Two small granitic plutons are observed within the volcanics. One of the stocks occupies the junction of Waswanipi and Chibougamau rivers while a quartz-feldspar-porphyritic rock underlies an area west of Opawica Island, southeastward to north of Bachelor Lake. It is believed to be of a possible volcanic origin.

• 16.

Structure

The volcano-sedimentary rocks are probably closely folded all over the area but more determination of the attitude of beds is required in various parts of the area for accurate structural analysis. Most of the rock formations are steeply dipping or vertical and strike in a northeasterly direction, slightly variable throughout the area. (See geological map for attitude of rocks in different areas). Only one top determination was. possible in the S.E. corner of the map-area where well preserved pillowed flows show tops toward the north. A few faults of variable importance are reported on different geological maps. M. Van de Wall stated that the band of "Temiscamian" sedinv its he mapped could possibly form the core of a large anticline, based on observation of graded bedding. 17.

GEOCHEMISTRY

A total of 18 rock samples were collected for total rock analysis. The locations of the samples were chosen so as to simulate as good a geochemical traverse as po::,sible across the north half of the Bachelor Lake volcanic belt and are plotted on the geological map. The assay results are reported in annex I.

Plotting the results on an AFM diagram reveals that two different series of differentiated voicanics could be present across the belt although not clearly shown on our geological map and of unknown relationship (see Figu-:e 4 and 5). The geochemical results seem to define a tholeiitic series (Figure 5-B) with iron-enrichment, in mainly basaltic rocks with a few andesitic flows and a calc-alkaline trend (Figure 5-A) with an enrichment in alkalis in andesitic to rhyolitic rocks but with ununiform ground distribution. An interesting fact is that the pyroclastic horizons within the belt seem to be part of that possible calc-alkaline series.

Although very limited in number and of uncontrolled quality (no microscopic identification of the rocks assayed and no real control on the geochemical traverse), those geochemical results:are''.certainly encouraging as a possible calc-alkaline series is present as well as a pyroclastic member of such a series with which most of the economic deposits of different volcanic belts are associated. 3

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EFeO

Na0 + K20 MgO

Figure 4: T.FM Diagram ~ Fe0 E.Fe0

NaC +1:20 Mg0

Figure 51 AFM Diagrams (A) F Dssible Calc-Alkaline Series (B) Possible Tholaiitic Series 20.

MINERALIZATION

All the Au and Cu-Zn showings known in the region are located just south of our map-area.. Except fog trace of pyrite and pyrrhotite in both basic volcanics and gabbros, no new sulfides showings were found during our programme.

A few sulfides intersections (py-po-low cpy) were reported in the assessment files but no interesting values have been obtained to date.

CONCLUSIONS

The Bachelor Lake greenstone belt as investigated seems to represent a differentiated submarine volcanic sequence. Geochemical results as well as geological investigation proved to be encouraging as a possible calc-alkaline series exists in association with the development of an inter- mediate to felsic pyroclastic member.. Although no base metal showings are known in the map-area, the immediate area to the south has been a Cu-Zn producer (Conigas Mine) and several Cu-Zn and Au occurences are known. On the basis of the previous statements, the map-area is believed to be favour- ...dole for volcanogenic base metal derosits as well as Cu-Ni deposits-(associated with gabbroic rocks) and gold deposits.

21.

RECOMMENDATIONS

Given that the area open for staking has been reserved for flying an INPUT survey by Questor, it is recommended that:

(1) all the ground open for staking and geologically interesting be staked as early as possible in 1978 (as long as no recent claims are reported on claim maps).

(2) an INPUT EM-Mag survey be flown over the area previously staked and over the north halves of Boyvinet and Gand townships as shown on Figure 3.

(3) consent of the Indians of Waswanipi be obtained for ground acquisition and ground follow-up within their territory.

Expenditure estimates arc as follows:

1978 Costs:

Ground acquisition-200 claims @ $75.00/claim $15,000.00 Aerial survey - 1600 km @ $18.75/km 30,000.00 More ground acquisition-50 claims @ $75.00/claim 3,750.00 Geological mapping 10,000.00 Linecutting & ground geophysic - 160 km @ 4218.75/km 35,000.00

$9?,750.00

1979 Costs:

Drilling (13 holes) 5200' @ $16.00/ft. $83,200.00

22.

REFERENCES

1. Boldy, J. Report on Guidelines for Volcanogenic 1975 Sulfide Exploration, Internal Report, Shell Canada Resources Limited

2. Brooks, C. & The Relationship of Base Metal Mineralization Gilimas, to the Chemostratigraphic Divisions in 1977 Volcanic Rocks of Canadian Archean Greenstone Belts. IREM-MERI, Research paper 77-1 3. Dugas, J. Geology of East Half of Lesueur Township, 1975 Q.D.N.R. P.R. 612

4. Langley, W.W. Region du Lac Bachelor, M.M.Q. R.G. 47 1951

5. Quebec Government, Convention de la Baie James et du nord Quebecois, 1976 Editeur officiel du Quebec.

6. Shaw, G. Opawica Lake, Canada Department of Mines and 1939 Resources, Map 556A

7. Shaw, G. Lewis Lake, Canada Department of Mines and 1939 Resources, Map 555A

8. Van de Wall, M Geology of the Northwest Quarter of Lesueur 1970 • Township, Q.D.N.R. and P.R. 599

4

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ANNEX I 23,

ROCK ANALYSIS (See geological map for location of samples)

16-`E°-77 X-RA'! ASSAY LC.â.°ATCRIES - P,CCY, MIUS13

S102 $11.203 M$:20 K20 FEU !1 i0 1102 C'2735 1. F'ErUW~1 Z1.M

47. 75 11. 33 3. 30 5. 09 L 58 0. 06 1.6. 93 J. 23 1. 96 0. 11 3. 45 3. ?2 99. 2✓?

AU-7 44. 31 13. 47 6. 39 4. 09 O. 09 2 32 16. 90 0. 13 I. 64 0. 07 3. 81 4. 11 100. 62

AW-9 63. 03 1.5. 03 3. 34 2. 35 4. 33 1. 47 4. 52 O. 12 O. 57 0. 05 4. 33 1. 32 100. 25

t' W-3 67. 94 15. 16 3. 09 0. 86 5. ?3 0. 79 3. 66 2 03 0. 52 0. 06 1. 13 4. 24 99. 54

C i-10 44. 73 15. 55 10. 11 1. .;...°° 4. 98 0. 4° 10. 76 0. r 0. 81 0. 03 9. 42 5. 71 100. 20

.31-i8 59. 15 15. 53 7. 93 L I. °4 1. 09. 6. 27 0. 11 0. 71 0. 08 3. 45 ?_ 45 99. 49

.if-25 67. 35 14. 76 2 53 I. 45 7. 14. O. 64 I. 11 0. 02 0. 54 0. 06 3. :v 0. 73 ?9: 15

61-27 59. 67 14. 52 4. 49 4. SI 7. 25 0. 61 4. 9? 0. 07 O. 37 0. 07 1. 77 1. 03 99. 63

1944-30 44. 22 13. 72 7. 20 6. 16 3. 08 0. 03 14. 66 0. 17 1. 51 0. 05 3. 42 2_ 33 10+),,87

t5,4-34 43. 37 14. 72 7.8.6 5. 75 3. 60 0. 04 12 47 0. 16 1. 32 O. 05 3. 43 Z. 17 99. 17

!~-~.5 46. 43 13. 23 13. 24 5. 02 1. 53 O. 03 10. 92 J. 17 1. 11 0. 04 2 45 ? 15 o6 3? 24.

19-OCT-77 X-RAY ASSAY ! AWP,A3'O4IES - Rr,CY, ANALYSIS

SOPtE SIfl2 41203 CAQ Ki33 NA20 K20 EEO FRO TI02 I'205 L. n. I. FEOMS0

C14-4 58. 19 15. 94 3. 72 3. 71 3. 79 1. 22 8. 46 0. 06 0. 79 0. 15 2 93 .'Z 23

CV)-8 44. 25 14. 26 °. 23 3. 21 2.74 0. 04 16. 72 0. 25 1 36 0. 15 4. 35 5. 20 97. 93

w4-10 46. 85 14. 10 ?'. 90 7.13 2 21 0. 16 12. 93 O. 22 1. 03 0. 04 2 31 1. 81 98. :.L

3}d-21 ',4. 00 14. 84 Z 95 2. 25 5. 99 0: 82 4. FS 0. 07 0. 52 0. 11 2;:.? 2 02 93. 90

114-31 47. 16 14. 2;` 9. 10 ? 65 4. 59 O. 20 10. 92 0, 20 1. 45 0. 10 8. 59 4. 11 100. 41

iiW-54 76. 20 12 79 0. 47 0.14 6. 59 O. 70 0. 35 "v. 01 0. 09 0. 02 O. 82 6. 04 98. 78

14H-62 59. 22 14. 64 5. 44 5.0I 3.:'•6 1. 00 6. 22 0.11 0. 56 0. 09 1. Ez5 1. 24 99. 18