UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY

Analytical results and sample locality map of heavy-mineral-concentrate and rock samples from the Mount Grafton Wilderness Study Area (NV-040-169), White Pine and Lincoln Counties, Nevada

By Gordon W. Day and Harlan N. Barton

Open-File Report 86-463

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. Any use of trade names is for descriptive purposes only and does not imply endorsement by the USGS. 1986 CONTENTS Page Studies Related to Wilderness...... 1 Introduction...... 1

Methods of Study...... 1

Sample Medium...... 1

Sample Collection...... 1 Heavy-mineral-concentrate samples...... 3 Sample Preparation...... 3 Sample Analysis...... 3 Spectrographic method...... 3 Rock Analysis Storage System (RASS)...... 3 Description of Data Tables...... 4 References Cited...... 4 ILLUSTRATIONS Figure 1. Location of the Mount Grafton Wilderness Study Area (NV-040-169), White Pine and Lincoln Counties, Nevada...... 2 Plate 1. Localities of heavy-mineral-concentrate and rock samples, Mount Grafton Wilderness Study Area (NV-040-169), White Pine and Lincoln Counties, Nevada...... in pocket TABLES Table 1. Limits of determination for Spectrographic analysis of heavy- mineral -concentrate samples...... 5 Table 2. Results of Spectrographic analyses of heavy-mineral-concentrate samples...... 6 Table 3. Correspondence of sample identification numbers of Mineral Resources Bulletin and field numbers of this report for heavy-mineral-concentrate samples...... 12 Table 4. Results of Spectrographic analyses of rock samples...... 15 STUDIES RELATED TO WILDERNESS Bureau of Land Management Wilderness Study Areas The Federal Land Policy and Management Act (Public Law 94-579, October 21, 1976) requires the U.S. Geological Survey and the U.S. Bureau of Mines to conduct mineral surveys on certain areas to determine their mineral values, if any. Results must be made available to the public and be submitted to the President and the Congress. This report presents the results of a geochemical survey of the Mount Grafton Wilderness Study Area, White Pine and Lincoln Counties, Nevada. INTRODUCTION In May 1984, the U.S. Geological Survey conducted a reconnaissance geochemical survey of the Mount Grafton Wilderness Study Area (NV-040-169), White Pine and Lincoln Counties, Nevada. ? ? The U.S. Geological Survey studied 30,115 acres (47 mi^) (122 knr) of the 73,216-acre (114-mi z ) (295-knr) Mount Grafton Wilderness Study Area in southeastern White Pine County, Nevada, and in northeastern Lincoln County, Nevada. Throughout this report, "Wilderness Study Area" and "study area" refer only to the area studied by the U.S. Geological Survey. The study area lies about 50 mi (80 km) south of Ely, Nevada (see fig. 1). Access to the study area is provided by roads and jeep trails branching from U.S. Highway 93. The study area consists principally of a high, structurally simple block of lower Paleozoic sedimentary rocks, composed largely of Prospect Mountain Quartzite, Piocha Shale, and Pole Canyon Limestone striking generally north and dipping moderately east. The topographic relief in the study area is about 4,300 ft (1,310 m). The southern half of the study area consists of mountains forming a single north-south ridge; the northern half consists of scattered mountain peaks. The ground surface rises from about 6,700 ft (2,042 m) near the southeastern corner of the study area to the 10,990 ft (3,350 m) summit elevation of Mount Grafton near the center of the study area. There are conifers and aspen trees at the higher elevations and sagebrush at the lower flanks of the mountains. The climate is arid to semiarid. METHODS OF STUDY Sample Medium Heavy-mineral-concentrate samples provide information about the chemistry of certain minerals in rock material eroded from the drainage basin upstream from each sample site. The selective concentration of minerals, many of which may be ore related, permits determination of some elements that are not easily detected in stream-sediment samples. Analyses of unaltered or unmineralized rock samples provide background geochemical data for individual rock units. On the other hand, analyses of altered or mineralized rocks, where present, may provide useful geochemical information about the major- and trace-element assemblages associated with a mineralizing system. R. 63 E. R. 64 E. ,| 4o45' R.65C. R. 6S £.

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Figure 1. Location of the Mount Grafton Wilderness Study Area (NV-040-169), White Pine and Lincoln Counties, Nevada. Sample Collection Heavy-mineral-concentrate samples were collected at 69 sites (plate 1). At 7 of these sites, a duplicate sample was also collected as part of a general study to determine analytical and sampling variation. The duplicate samples are shown by a slashed line (/) between the sample numbers on plate. The average density was about one sample site per 1.5?mi . The area of the drainage basins sampled ranged from 0.3 mi to 1.5 mi . Heavy-mineral-concentrate samples Heavy-mineral-concentrate samples were collected from active alluvium primarily from first-order (unbranched) and second-order (below the junction of two first-order) streams as shown on USGS topographic maps (scale = 1:24,000). Each sample was composited from several localities within an area that may extend as much as 100 ft from the site plotted on the map. Each bulk sample was screened with a 2.0-mm (10-mesh) screen to remove the coarse material. The less than 2.0-mn fraction was panned until most of the quartz, feldspar, organic material, and clay-sized material were removed. Sample Preparation After air drying, bromoform (specific gravity 2.8) was used to remove the remaining quartz and feldspar from the heavy-mineral-concentrate samples that had been panned in the field. The resultant heavy-mineral sample was separated into three fractions using a large electromagnet (in this case a modified Frantz Isodynamic Separator). The most magnetic material, primarily magnetite, was not analyzed. The second fraction, largely ferromagnesian silicates and iron oxides, was saved for archival storage. The third fraction (the least magnetic material which may include the nonmagnetic ore minerals, zircon, sphene, etc.) was split using a Jones splitter. One split was hand ground for spectrographic analysis; the other split was saved for mineralogical analysis. These magnetic separates are the same separates that would be produced by using a Frantz Isodynamic Separator set at a slope of 15° and a tilt of 10° with a current of 0.1 ampere to remove the magnetite and ilmenite, and a current of 1.0 ampere to split the remainder of the sample into paramagnetic and nonmagnetic fractions. Sample Analysis Spectrographic method The heavy-mineral-concentrate and rock samples were both analyzed for 31 elements using a semiquantitative, direct-current arc emission spectrographic method (Grimes and Marranzino, 1968). The elements analyzed and their lower limits of determination for heavy-mineral-concentrate samples are listed in table 1. The lower limits of detection for rock samples are one-half the values listed in table 1. Spectrographic results were obtained by visual comparison of spectra derived from the sample against spectra obtained from standards made from pure oxides and carbonates. Standard concentrations are geometrically spaced over any given order of magnitude of concentration as follows: 100, 50, 20, 10, and so forth. Samples whose concentrations are estimated to fall between those values are assigned values of 70, 30, 15, and so forth. Values determined for the major elements (iron, magnesium, calcium, and titanium) are given in weight percent; all others are given in parts per million (micrograms/gram). Analytical data for heavy-mineral-concentrate samples from the Mount Grafton Wilderness Study Area are listed in table 2. Analytical data for rock samples are listed in table 3. ROCK ANALYSIS STORAGE SYSTEM Upon completion of all analytical work, the analytical results were entered into a computer-based file called Rock Analysis Storage System (RASS). This data base contains both descriptive geological information and analytical data. Any or all of this information may be retrieved and converted to a binary form (STATPAC) for computerized statistical analysis or publication (VanTrump and Miesch, 1977). DESCRIPTION OF DATA TABLES Table 2 lists the results of analyses for the samples of heavy-mineral concentrate. The data are arranged so that column 1 contains the USGS- assigned sample numbers. These numbers correspond to the numbers shown on the site location map (plate 1). Columns in which the element headings show the letter "s" below the element symbol are emission spectrographic analyses. A letter "N" in the tables indicates that a given element was looked for but not detected at the lower limit of determination shown for that element in table 1. If an element was observed but was below the lowest reporting value, a "less than" symbol (<) was entered in the tables in front of the lower limit of determination. If an element was observed but was above the highest reporting value, a "greater than" symbol (>) was entered in the tables in front of the upper limit of determination. Because of the formatting used in the computer program that produced the table, some of the elements listed in the table (Fe, Mg, Ca, Ti, Ag, and Be) carry one or more nonsignificant digits to the right of the significant digits. The analysts did not determine these elements to the accuracy suggested by the extra zeros. REFERENCE TO MINERAL RESOURCES BULLETIN An interpretative report on the mineral resource potential of the Mt. Grafton Wilderness Study Area (Van Loenen and others, 1987) uses a different sample identification system for the same heavy-mineral-concentrate samples than are identified by field numbers in this report. The correspondence between the two identification systems are presented in table 4. REFERENCES CITED Grimes, D. J., and Marranzino, A. P., 1968, Direct-current arc and alternating-current spark emission spectrographic field methods for the semiquantitative analysis of geologic materials: U.S. Geological Survey Circular 591, 6 p. Van Loenen, R. E., Blank, H. R., Barton, Harlan N. (U.S. Geological Survey), and Chatman, Mark L. (U.S. Bureau of Mines), 1987, Mineral resources of the Mount Grafton Wilderness Study Area, Lincoln and White Pine Counties, Nevada: U.S. Geological Survey Bulletin 1728-F. VanTrump, George, Jr., and Miesch, A. T., 1977, The U.S. Geological Survey RASS-STATPAC system for management and statistical reduction of geochemical data: Computers and Geosciences, v. 3, p. 475-488. TABLE 1. Limits of determination for the spectrographic analysis of heavy-mineral concentrates based on a 5-mg sample

Elements Lower determination limit Upper determination limit

Percent

Iron (Fe) .1 50 Magnesium (Mg) .05 20 Calcium (Ca) .1 50 Titanium (Ti) .005 2

Parts per million

Manganese (Mn) 20 10,000 Silver (Ag) 1 10,000 Arsenic (As) 500 20,000 Gold (Au) 20 1,000 Boron (B) 20 5,000 Barium (Ba) 50 10,000 Beryllium (Be) 2 2,000 Bismuth (Bi) 20 2,000 Cadmium (Cd) 50 1,000 Cobalt (Co) 10 5,000 Chromium (Cr) 20 10,000 Copper (Cu) 10 50,000 Lanthanum (La) 50 2,000 Molybdenum (Mo) 10 5,000 Niobium (Nb) 50 5,000 Nickel (Ni) 10 10,000 Lead (Pb) 20 50,000 Antimony (Sb) 200 20,000 Tin (Sn) 20 2,000 Strontium (Sr) 200 10,000 Vanadium (V) 20 20,000 Tungsten (W) 100 20,000 Yttrium (Y) 20 5,000 Zinc (Zn) 500 20,000 Zirconium (Zr) 20 2,000 Thorium (Th) 200 5,000 01 .Z.-f Results.-.of 'pectr analyses of : heavy-mineral -concentrate- sampled from the. Mount Grafton Wilderness Study Area, White and Lincoln Counties, Nevada "t _ ,;" ' [N/'not detected i detected but below the limit of determination shown; >, determined to be greater than the value shown.)

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'b.-tj 1 ,.'1.]1^ z> < ; i l ? 1 ",' "li'ii*. ''I-- Sample ', $" V.-ppm v W-ppm ' t-ppm ' Zij-ppm Zr-ppm Th-ppm ' ' I''''!''1' ' V'v~ ' s \\ 8 ;i & '. s S ' 6 4*' 'i '"' ' . ;Q''^«v /ji'/C1;- ' , ** 700 '* "I'l^'^y ' '.rt '^.HJ012H V 20 ' j'^OO N >2,000 N fc§ -'>-.' . MJ013H f& <2020-' 500 70 N >2,000 N jQr '^ ,,' > . KJ01UH h, 5,000 .'v150 { N >2,000 N : ' ' t'.'ji -;; ... MjoiSH .r,'* . 20 -: - ,20 '' IT , 500 N >2,000 N /.].''i' /' ' ' MJ016H ;-.;. 100 , ; 300 ; N >2,000 N "-'"id ' '' "' ' MJ017H '" "' 20"'- 8 ' V ' N N 700 >2,000 i t.J. ''.' '. MJ018H ' ' 20 V 700 N >2,000 N ** < CD -? '* i -.' ' HJ019H -<-V 20 500 200 ' N >2,000 N * F ' i..J MJ020H iT;, 20 5,000 . 70 N >2,000 N / "w f :"j'".y.'' MJ021H ' ; 20 150 500 N >2,000 N V .,'"I ''.S i 'Q^ ' >; ; ' ,?.-w MJ022H 1"k, r & 20 150 300 JT >2,000 N *l ,.' f ' j ",..- ;- MK 001 H -j, 20 100 100 N >2,000 V "<;.. ,.Q ,! . -:"v' . MK002H :.',' <20 100 ; 50 N >2,000 N Vyi 'H ....v'tt i MK003H t ,;' <20 V N R 700 v if** i"5 ' 'V jfy' *;.;..: < HKOOUH :., 20 200 N >2,000 N *y^. .0 r 'V^ , ' f ' - '' "[' ; 1 ;!'" i; . MK005H -, ' - ' 20 - V ' 150 N >2,000 N "£*) "' "-^^' y-v" - HK006H .,; ;- '. ^ <20 500 A y 100 ..'; N >2,000 V ^7*ii ''.©I I'M ii:Ii-'>i "K o o 7H v!.|.- j; :,",, 20 V './ 1,000 ;;, N >2,000 N $» ' ; ;' ' !jl'l' 1v'l'VVIV^^OO^^ ?K' ",'v ;,'<2o - M .;V. ,. 150 ' " N >2,000 . N "i'l&i V^T;?1 MKO° 9H :j( v' ';!' '20 ...100.^ tsoo.j; K >2,000 N '\i ^H;fe"iVHKo"l IH" 't-''v ': 20" VSOO' '; r'a .i 150 f IT >2,000 N '" '' 'ISj ' '-^ '" "''' K K 0 1 2 H i-. t ."' i <20 V \ '"'300? N >2,000 N ".©'"^f1^; ' HKOISH '!'': ' : . N 1 500 K >2,000 N ^ *} >,; 30 500 ', 'V'*j;, . Vvt^*A ' '?',"( '.' . W^AIfiUKO"UH ,,,!' v c .': (. 20 H ': N >2,000 N 4*1 "- HK015H >»,.,!« S-.S20 "' -. ' N ?' ',.200 N >2,000 N '^Y7j;Af 1 »»,],.- ' '" J * h p 1 *I'*^*' ' * * ' t ' ""t^ > . «yv|>r'{ ^3=.v MKO'ISH''^'," ^ '* '* ' ' 'j\ ^raf '' 20 . -, N i.''' 15050 " N >2,000 N 1' '-'&J' $ £'' ."* HK017H '.' ' .. ..' 20 1? K >2,000 N $2 w.'-'V'v'' KK018H ' iv > jj©.Ty T,20 ; 300 ;. 200 : . N >2,000 N ''X'V-K ! WJ-.i:- KK019H '. -' ^20 : 300 >v 100 .'. *, N >2,000 N ffi ';i' ';'';! ' "A ]$.! HK021H VM" ';;,20 '100 , 500, > N >2,000 N i...j. 11 y?' f- !!,«' ' '.;'" ^ "* *$> .'V,;,^,. HK022H !*^ r '20 H A 700 yv! N N 'ffi$ >2,000 ;'f% : ' : :' i: ;";. ., ' ; -^ U' «V&:V ;W?^ *.fl " t*Ivi" l^ *> " '. .'' '." .*$ ]; ''. '. ' I'^'-V*!*.'".." '" '':'-' , '; 1 4" ' ^''.©/ H. '/ ">"'-' <\- . -,'' '' .'^V'' '',f; j;!t jj '^':'"''j ""::''' /'..1 "*;(/.*'" *" ' . «'' < . . .

'O, TABLE 3.--SPKCTPnnRPPHTC ANALYST?; OF ROCK SAMPLES , not <, detected but below the limit of determination shown; >, determined to be greater than the value shown.]

Sample Latitude Longitude Smpl.des'1 Fe-pct. Kg-pct . Ca-pct. Ti-pct. Kn-ppm Ag-ppm ^s-ppm Au-ppm B-ppnt Ba-ppm s s S s s s s s s s

MG01 38 41 26 114 42 59 1 5.00 .70 .03 .500 100 <.5 <700 <15 20 700 MC02 38 41 34 114 43 0 1 .50 .07 .02 .070 3,000 20.0 <700 <15 10 5^0 KG "3 38 4D 58 114 44 9 1 5.00 .7C' .07 .300 150 <.5 <700 <15 5C 1,000 "G04 38 41 11 114 42 42 1 5.00 .7D .05 .300 150 <.5 <700 <15 30 700 KC05 38 40 1ft 114 42 12 7 .15 .05 15. 00 .007 50 150.0 <700 <15 <10 700

MG">6 38 ?Q 28 114 42 15 7 >20.00 .05 .15 .030 150 7.0 <700 <15 <10 100 KG07 38 4 1 35 114 44 29 7 .15 <.C2 <.05 .050 < 1 0 < . 5 <700 <15 <10 70 MG08 38 36 54 114 45 18 8 5.00 .05 <.05 .030 300 200.0 700 <15 <10 1,000 MG09 ^8 ^6 51 114 44 37 1 5 .00 1.50 .20 .500 500 <.5 <700 <15 10 1,500 MG1D 38 37 46 114 42 9 7 <.05 <.02 <.05 .030 15 <.5 <700 <15 <10 30 «rn 38 36 27 114 44 28 7 .70 .10 <.05 .100 15 <.5 <700 <15 <1C 150 MG12 38 38 38 114 44 28 2 10.00 5.0D 3.00 >1 ,OOD 2,000 <.5 <700 . <15 <1C 200 WG13 38 39 3 1 la 44 34 3 .70 .70 .15 .070 300 <.5 <700 <15 <1C 70 KG1U iB 36 33 114 42 18 6 3.00 .15 15.00 <.002 200 200.0 700 < 15 <1 0 50 KC15 38 36 31 114 42 14 6 .70 1.50 20.00 .030 150 <.5 <700 <15 <10 200

KG16 3P 37 35 114 43 42 1 7. CO 1.50 , 2 a .300 200 <.5 <700 <15 20 1,000 f G17 38 37 35 114 43 42 8 15.00 .50 15.00 .^70 1,500 5.0 <700 <15 <1C 3f>0 KG18 38 37 38 114 43 37 1 20.00 1.00 23.00 .150 1,5CO <.5 <7CO <15 <10 200 KG 10 78 37 28 114 43 44 1 10.00 .70 2.00 .070 >5,iQO 7.0 <700 <15 <1C 300 KC23 38 46 28 114 47 11 6 .70 . 15 10.00 .100 200 5.0 <700 <15 <10 500 3"> W021 38 46 114 47 13 8 .20 .05 1.00 .030 30 7.0 <70C <15 <1C 150 MG22 3P 45 30 114 44 2 7 <.05 <.02 <.^5 .005 < 10 <.5 <700 <15 <10 50 "G23 3ft U5 21 11U 42 54 5 <.05 7.00 7.00 <.002 30 <.5 <700 <15 <10 <20 KC24 38 45 5 114 46 2 6 .05 .20 >20.00 .003 200 <.5 <700 <15 <10 <20 MG25 38 37 21 114 41 29 5 <."5 7.00 10. OJ <.002 10 <.5 <700 <15 <10 <20

KG25 38 37 11 114 41 39 7 .10 .05 .15 .007 30 <.5 <700 <15 <10 70 KG27 38 36 20 114 41 18 4 3.00 1.50 3.00 .300 700 <.5 <700 <15 <1C 1,000 KG28 38 38 33 114 47 49 1 .15 .02 .05 .020 30 1,500.0 <700 <15 <10 70

ISample description codes are: (1) argllUte, (2) basalt, (3) conglomerate, (4) dacite, (5) dolomite, (6) limestone, (7) quartzite, and (8) vein quartz, TABLE 3.--SPF.CTPOGBAPHIC ANALYSIS OF POCK SAMPLES Continued

Fample Be-ppm Bi-ppm Cd-ppm Co-ppm Cr-ppm Cu-ppffl La-ppm Ho-ppm Nb-ppm Ni-ppm Pb-ppm Sb-ppm Sc-ppm Sn-ppm s s s s s s s s s s s s s

MG01 3^.0 <1C <30 10 70 15 50 <5 <20 70 <10 <100 15 MG02 2.0 <10 <30 10 1C 100 <3<"> <5 7 150 <100 <5 HG03 3.0 <10 <30 7 50 10 70 <5 '<20 30 10 <100 15 KG^U 1.5 <10 <30 5 70 30 70 <5 <20 30 20 <100 15 MGC5 <10 <30 <5 < 1 0 20 <30 <5 <20 <5 200 100 <5

2.0 15 <10 200 <30 <20 20 100 200 <5 <30 <5 < 1 0 <5 <30 <5 <20 <10 <100 <5 0.0 <30 <5 <10 . 700 <3? <5 2,564 7 200 500 <5 20 2.n <30 10 70 15 100 <5 <20 20 10 <100 15 KC11 <30 <5 <10 <5 <30 <5 <20 <5 <1D <100 <5

MG11 <30 <5 <10 30 <30 <5 <20 10 <10 <100 <5 WC12 1.0 <30 50 70 300 <30 <5 <20 70 30 .<100 50 KG 13 <30 5 <10 200 <30 <5 <20 5 <10 <100 <5 K G1U 3)0 OO 5 <10 2f.,000 <3C <5 <20 5 2,000 500 <5 100 MG15 <30 <5 15 7 <30 <5 <20 5 <10 <100 <5

MG16 5.0 <30 15 70 30 70 <5 <20 50 <10 <100 20 MG17 30.0 15 1C 700 <30 <5 <20 5 15 <100 5 15 PC 18 <^Q . 0 <30 15 20 300 50 <5 <20 15 50 <100 7 50 KG19 150 70 15 7 70D

HG21 <1 .0 <30 <5 00 70 <30 <5 <20 7 70 200 <5 MG22 <1 .0 <30 <5 <10 <5 <30 <5 <20 <5 <10 <100 <5 MG23 <30 <5 <10 <5 <30 <5 <20 <5 <10 <100 <5 <30 <5 <10 <5 <30 <5 <20 <5 <10 <100 <5 MG25 <30 <5 <10 <5 <30 <5 <20 <5 <10 <100 <5 MG26 <1 .0 on <5 <10 <5 <30 <5 <20 <5 <10 <100 <5 fG27 1 .0 <30 15 15 20 70 <5 <20 15 20 <100 15 MG?8 <5 <10 7,000 <30 <5 <20 <5 >20,000 3,000 <5 TABLE 3. SPFCTBOHRAPHIC ANALYSIS OF ROCK SAMPLES Continued

Sample Sr -ppm V-ppm W-ppm Y-ppm Zn-ppm Zr-ppm Th-ppm Au-ppm As-ppm Bi-ppm Cd-ppm Sb-ppra Zn-pp» W-ppm S P s s s s s a* aa aa aa aa aa cm HCV1 <100 70 <5C 30 <20C 300 <200 __ <5 <2 .2 <2 20 MG02 2"0 10 5,000 <10 <200 50 <200 <. 1 127 -- 2.3 -- <2 3,800.00 HG13 <1'0 100 <50 50 <200 300 <200 -- <5 <2 .2 <2 42 -- <1DO 70 <50 30 <200 300 <200 -- 8 <2 3 <2 60 -- 150 <10 <50 30 <200 20 <2GO <. 1 36 -- 2.8 -- 10 3.80

< 1 r> o 70 200 <10 SCO 30 <200 <. 1 65? 3.3 -- 97 2PO.OO MG07 <1DO <10 <5"> <10 <2CO 70 <2^0 -- <5 <2 <. 1 <2 <2 -- MG08 <10 <200 50

MG11 <1DG 15 <50 <10 <200 300 <2GO __ <5 <2 <. 1 <2 2 _- 700 500 <50 50 <200 150 <200 -- <5 <2 1.0 <2 103 -- KG13 <1CU 15 <50 <10 <20D 200 <2"-0 -- <5 <2 <. 1 <2 16 __ KG1U 100 150 <50 <10 2,000 <10 <200 <. 1 1,680 __ 33. P -- 2,290 2U.OO MG15 1 ,000 15 <50 10 <200 20 <200 -- <5 <2 .3 <2 12 --

MG1? <100 100 <53 50 <2 r O 200 <2CO __ 41 <2 . <4 <2 57 -- MG17 <"IOO 15 300 20 3,000 150 <200 <. 1 849 -- 29.9 __ 3,500 530.00 MG18 100 30 70 30 7^0 150 <200 <. 1 R 4. 1 -- 652 260.00 KG 19 <1'G 15 70 15 >1^,000 70 <200 <. 1 255 -- 77.6 -- >40,000 400.00

'100 10 <50 <10 200 15 <200 <. 1 36 __ . 3 __ 38 2.0J KG22 <12C <10 <50 <10 <2 n O 15 <200 -- <5 <2 <.1 <2 <2 -- KG?3 <100 <10 <50 <10 <200 <10 <200 -- 7 <2 <.1 12 <2 -- MG?U 5 r'0 <1C <50 <10 <200 <10 <200 -- <5 <2 <. 1 <2 <2 -- KG25 <100 <10 <50 <10 <200 <10 <20C -- <5 <2 <.1 12 <2 --

«G?5 <1CO <10 <50 <10 <200 20 <200 __ 10 <2 <. 1 <2 (4 _- MG27 50C 150 <50 15 <200 100 <200 -- <5 <2 .3 <2 28 -- KC28 100 <10 <50 <10 >10,000 10 <200 <. 1 262 na.o 20,200 .81 TABLE 4. Correspondence of sample identification numbers of Mineral Resources Bulletin (MR no.) and field numbers (Field no.) of this report, for heavy- mineral-concentrate samples

MR no. Field no. MR no. Field no. MR no. Field no.

01 MAO 18 24 MK007 47 MAO 10 02 MAO 16 25 MJ009 48 MA008 MA017 26 MK011 48 MA009 03 MK014 27 MJ011 49 MHO 12 04 MK015 27 MJ012 50 MH011 05 MK016 28 MJ010 51 MA002 06 MK017 29 MJ013 52 MH014 07 MA020 30 MJ014 53 MHO 13 08 MA019 31 MJ017 54 MA001 09 MJ001 -- MJ018 55 MH003 10 MK001 32 MJ016 56 MH001 11 MJ002 33 MJ015 57 MH002 12 MJ004 34 MJ019 58 MK012 13 MK003 35 MJ021 59 MAO 14 14 MK002 36 MJ020 60 MK013 15 MJ003 37 MJ022 61 MAO 15 16 MK004 38 MK022 62 MH005 17 MJ005 39 MA023 63 MH006 18 MK005 40 MK021 64 MH007 19 MJ006 41 MA022 65 MH008 20 MK006 42 MA021 65 MH009 21 MJ007 43 MK018 66 MHO 10 22 MK008 43 MK019 67 MA003 22 MK009 44 MA013 68 MA004 23 MJ008 45 MA012 69 MA006 46 MA011

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