Stream Sedinent, Float, and Bedrock Sampling in the Porcupine Mining Area, Southeast Alaska

STREAM SEDINENT, FLOAT, AND BEDROCK SAMPLING IN THE PORCUPINE MINING AREA, SOUTHEAST ALASKA

By Jan C. Still, and Kevin R. Weir, U.S. Bureau of Mines and Wyatt Gilbert, and Earl Redman, State of Alaska Division of Geological and Geophysical Surveys

* * * * * * * * * * * * * * * * * * * * * * * * Open File Report 173-84

UNITED STATES DEPARTMENT OF THE INTERIOR

Donald Paul Hodel, Secretary

BUREAU OF MINES

Robert C. Horton, Director

TN 23 .U44 84-173 c.2 -l t' d )

- J ) I

UNITED STATES BUREAU OF MINES

JAMIES BOYD MEMORIAL LIBRARY CONTENTS

Page

Abstract...... 1

Introduction...... 2

Anomalous levels...... 2

Results...... 2

Conclusions...... 4

References...... 5

Appendix A Anomalous Levels ...... 6

Appendix B Analytical results ...... 8

ILLUSTRATIONS

1. Alaska showing the location of the Porcupine Mining area.

2. Porcupine Mining area showing sample localities, anomalous elements and lode prospects and deposits. UNITS OF MEASURE USED IN THIS REPORT ft - foot in - inch

% - percent ppm - parts per million

ii STREAM SEDIMENT, FLOAT, AND BEDROCK SAMPLING IN THE PORCUPINE MINING AREA SOUTHEAST ALASKA

By Jan C. Still 1, and Kevin R. Weir 2 U.S. Bureau of Mines and Wyatt Gilbert 3, and Earl Redman 4, State of Alaska Division of Geological and Geophysical Surveys

ABSTRACT

As part of a cooperative project during 1983 and 1984, personnel from the State of Alaska Division of Geological and Geophysical Surveys and the U.S. Bureau of Mines collected 366 stream sediment, float and bedrock samples in the Porcupine Mining area near Haines in Southeast Alaska. More than 240 of the 366 samples collected contained anomalous concentrations of one or more elements, indicating a variety of mineral deposit types including zinc-copper-silver-barium-gold-lead-cobalt massive sulfide and gold-silver vein or stockwork. Rock samples collected contain up to 531.1 ppm gold, 610.29 ppm silver, 13.4% zinc, 2.33% copper, 15.7% lead, 1070 ppm cobalt, 47% barium, 96 ppm molybdenum, 600 ppm tin, 4000 ppm arsenic, 800 ppm nickel, 2000 ppm bismuth and 7000 ppm antimony. Stream sediment samples collected contain up to 62.25 ppm gold, 4.896 ppm silver, 1810 ppm zinc, 310 ppm lead, 110 ppm cobalt, 2800 ppm barium and 400 ppm arsenic.

1 Mining Engineer, Alaska Field Operations Center, Bureau of Mines, Juneau, Alaska.

2 Field Technician, Alaska Field Operations Center, Bureau of Mines, Juneau, Alaska.

3 Geologist, Alaska Division of Geological and Geophysical Surveys, Juneau, Alaska.

4 Geologist, present address, Alaska Field Operations Center, Bureau of Mines, Juneau, Alaska. INTRODUCTION

As part of a cooperative project, to evaluate the economic mineral potential of the Porcupine Mining qrea, the State of Alaska Division of Geological and Geophysical Surveys and the U.S. Bureau of Mines in 1983 and 1984 collected 269 bedrock and float samples, 92 stream sediment and 5 panned concentrate samples in the Porcupine Mining area near Haines in Southeast Alaska. The Porcupine Mining area has been mined for placer gold since the turn of the century. It is bounded by the Tsirku River to the south and east, by the Alaska - British Columbia border to the west, and it extends several miles north of the Haines highway. Figure 1 shows the Porcupine Mining area while figure 2 shows the sample locations, anomalous element concentrations and known or reported mineral occurrences. Samples collected from previously known occurrences are reported in Still (1) and are not repeated here (for more information about area access, history and previous studies see Still (1)). In general, the area geology consists of paleozoic slate, volcanic rocks and limestone intruded by Cretaceous diorite. For more detail see the geologic map by Redman and others (2), which is at the same scale as figure 2 of this report. Previous geologic and geochemical work in the area was done in 1969-1971 by Winkler (3) and Mackevett (4).

ANOMALOUS LEVELS

Samples were often collected in areas where mineralization was known or likely to occur, resulting in a relatively higher percentage of anomalous samples than would have been the case if the samples had been collected on a more random basis. Anomalous levels were assigned by scanning the data and comparing them to anomalous levels determined by more detailed studies to the southwest in Glacier Bay (5) and to the east in the Skagway B-2 Quadrangle (6). Appendix A lists the anomalous levels from the Glacier Bay and Skagway B-2 studies and gives the anomalous levels determined for this report. Appendix B lists the analytical results for the sample locations shown on figure 2. More than 240 of the 366 analyzed samples contained anomalous concentrations of one or more metals.

RESULTS

Indications of massive sulfide type (Zn, Cu, Pb, Co, Ba, Au, Ag) mineralization were found at several locations throughout the study area. The most prominent of these are as follows:

Items in parenthesis are given in a list of references at the end of the text.

2 ~~~~~~oI I

Nome~~~~~~~~~ .Fairbonks

0g~ g 100\ 200 300 i% ad _ < \Scale, miles

9i21i ahe l , -_

/K,5(fi~~~~~~,,fik i

SO, Aleulion Islands C-

Figure 1.- Alaska, showing the location of the Porcupine mining area 1. Porcupine road area (map no. 67 to 77): stream sediment samples collected on the uphill side of the road contained up to 1810 ppm zinc, 800 ppm barium, 0.092 ppm gold and 4.896 ppm silver whereas float and bedrock samples contained up to 210 ppm zinc, 1.94 ppm silver, 150 ppm lead and 800 ppm barium. This area is underlain by limestone and slate.

2. West of Flower Mountain (map no. 128 to 130) (Claire Bear): bedrock samples collected from a massive sulfide lens at a dike-limestone contact, and similar float material, contained up to 56.16 ppm silver, 2160 ppm copper, 1070 ppm cobalt, 600 ppm tin, 1000 ppm arsenic, 1000 ppm bismuth and 7000 ppm antimony. This area is a roof pendant in diorite composed of slate, limestone and some volcanic rocks.

3. North of Boundary Glacier (map no. 116 to 121): float and bedrock samples of sedimentary and volcanic rocks contain up to 0.034 ppm gold, 1.214 ppm silver, 280 ppm zinc, 1390 ppm copper, 390 ppm cobalt, 47% barium, 400 ppm arsenic and 200 ppm nickel. This is an area of basalt and andesite with subordinate sedimentary rocks.

4. North of the Tsirku Glacier and River (map no. 149 to 168): float and bedrock samples contain up to 6.2% zinc, 2.33% copper, 1.18% lead, 450 ppm cobalt, 49.84 ppm silver, 0.30 ppm gold, 1.13% barium, 200 ppm tin, 400 ppm arsenic, 300 ppm nickel and 900 ppm bismuth; stream sediment samples contain up to 800 ppm zinc, 10 ppm silver, 2800 ppm barium, and 500 ppm tin. Bedrock is composed of volcanic rocks, slate, and limestone.

Placer gold has been reported or mined in Glacier, Porcupine, Cahoon, McKinley, Little Boulder, Big Boulder, Summit, Nugget, and Cottonwood Creeks and the Little Salmon River (7). These placers may indicate potential lode gold sources. Quartz veins and stringer zones hosted in slate have long been known by local prospectors. The following represents new information concerning potential vein gold and/or massive or disseminated sulfide gold mineralization:

1. McKinley Creek (map no. 100 to 109): some of the samples were collected within the Golden Eagle lode claims; samples of narrow quartz sulfide veins hosted in slate and dikes contain up to 182.13 ppm gold while one select native sulfur-sulfide rich sample contained 531.1 ppm gold; samples also contained up to 20.57 ppm silver, 9.5% zinc, 230 ppm cobalt, 430 ppm lead, 1910 ppm barium, 4000 ppm arsenic, and 100 ppm nickel.

2. Head of Porcupine Creek (map no. 132 to 141): an isolated sample of chalcopyrite-bearing quartz float contained 49 ppm gold, 74 ppm silver and 1% copper; samples of slate hosted quartz veins that occur in swarms contained up to 0.148 ppm gold, 390 ppm zinc, 1420 ppm barium, 60 ppm tin, 700 ppm arsenic, 200 ppm nickel and 3000 ppm antimony. This area is a roof pendant composed of slate, basalt and limestone.

3. On the north side of the Tsirku River a south flowing stream drains an area just to the south of the head of Porcupine Creek, (map no. 170). A single isolated stream sediment sample collected at the mouth of this stream contained 2.5 ppm gold and 240 ppm zinc.

3 A silver occurrence consisting of narrow galena-sphalerite quartz veins hosted in argillite is located 1.5 miles southwest of VABM knob 1720 (map no. 214 to 218) near a logging road locally called the Sunshine Mountain road. Samples collected of the veins contained up to 0.471 ppm gold, 610.29 ppm silver, 5.8% zinc and 15.7% lead.

Other areas of volcanic rocks, slate or limestone also contained anomalous values. The Pleasant Camp area (map no. 18 to 26) and the Glacier Creek area (map no. 57 to 66) are anomalous in gold, silver, lead and copper. Big Boulder Creek (map no. 27 to 43) is anomalous in gold and zinc while the area between Glacier and Jarvis Creeks (map no. 3 to 17) is anomalous in zinc. The Mosquito Lake area (map no. 191 to 204) is anomalous in gold, silver, zinc, copper and cobalt. Numerous other samples at various locations also contained anomalous metal concentrations.

CONCLUSIONS

The high number of anomalous samples (242 of 366) and the broad spectrum of anomalous elements (Au, Ag, Zn, Cu, Pb, Co, Ba, Mo, Sn, As, Ni, Bi, and Sb) reinforced by the previous findings of Redman and others (2) and Still (1) indicate that the Porcupine Mining area has potential for a variety of deposit types and is an exploration target for base and precious metal massive sulfide, and vein or stockwork, gold-silver deposits.

This is a preliminary report, and sampling and sample analysis are not yet complete. Additional work is slated for the 1985 field season, and a final geochemical report with complete sample results will be published in 1986.

4 References

1. Still, J.C., 1984, Stratiform Massive Sulfide Deposits of the Mt. Henry Clay Area, Southeast Alaska: U.S. Bureau of Mines Open-File Report 118-84, 65 p.

2. Redman, Earl, Gilbert, Wyatt, Jones, B.k., Rosenkrans, D., and Hickock, B.D., 1985, Preliminary Bedrock Geologic Map of the Skagway B-4 Quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys, Report of Investigations 85-6.

3. Winkler, G.R. and Mackevett, E.M, Jr., 1970, Analysis of Bedrock and Stream-Sediment Samples from the Haines Porcupine Region, Southeast Alaska: U.S. Geological Surveys Open-File Report 406, 90 p.

4. Mackevett, E.M., Jr., and others, 1974, Geology of the Skagway B-3 and B-4 Quadrangles, Southeast Alaska: U.S. Geological Survey Professional Paper 832, 33 p.

5. Brew, D.A. and others, 1977, Mineral Resources of the Glacier Bay National Monument Wilderness Study Area, Alaska, U.S. Geological Survey Open-File Report 78-494, 670 p.

6. Redman, Earl, Retherford, R.M., and Hickock, B.D., 1984, Geology and Geochemistry of the Skagway B-2 Quadrangle, Southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 84-31, 34 p 1:40,000, 4 sheets.

7. McLaughlin, Jim, Porcupine Mining area placer miner and prospector, personal communication 1984.

5 APPENDIX A

Anomalous Levels

6 ANOMALOUS LEVELS

A geochemical study conducted by the U.S. Geological Survey (USGS) in Glacier Bay National Park (bordering the Porcupine Mining Area to the Southwest, see figure 2) was based on over 1800 stream sediment and 1800 rock samples (5). A geochemical study conducted by the Alaska Division of Geological and Geophysical Surveys (ADGGS) in the Skagway B-2 Quadrangle (located to the east of the Porcupine Mining area) was based on 265 stream sediment samples (6). The anomalous levels reported by the above two studies are listed on the left below:

USGS Glacier Bay ADGGS B-2 ADGGS-USBM Porcupine Mining Area Stream Stream Rock and Stream Sediment Sediment Rock Sediment Anomalous Highly Anomalous Element ppm ppm ppm ppm ppm

Au 0.05 - 0.1 any 1.0 Ag 0.5 1 0.15 0.5 3 Zn 200 150 75-120 200 500 Cu 150 150 70-300 200 500 Pb 30 70 9-20 100 200 Co 70 100 13-20 100 200 Ba - - - 750 _ Mo 7 15 4-6 10 - Sn 10 15 3 any - As 200 - 10 100 - Ni 150 100 30-40 100 - Bi - - - any - Sb - - 1.4 200 -

Anomalous levels for this report were determined by comparison to the USGS and ADGGS studies and scanning the Porcupine Mining area data. The USBM-ADGGS Porcupine Mining area anomalous levels are shown above on the right.

7 APPENDIX B

Analytical Results

See footnotes at the end of Appendix B for list of abbreviations.

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X - signifies sample analyzed by ADGGS by Atomic Absorption Spectroscopy (AAS) methods.

2. Au, Ag analyses were by fire assay - Inductively Coupled Plasma Analysis (ICP), or by fire assay unless marked X.

3. Zn, Pb analysis was by Atomic Absorption Spectroscopy (AAS) while Cu, Co analysis was by ICP unless marked X.

4. Ba analysis was by X-ray diffraction.

5. Mo, Sn, As, Ni, Bi, and Sb analyses by semiquantitative spectrographic analysis.

Sample analyses were by the Bureau of Mines Research Center in Reno, Nevada unless marked X (see #1).

Units of measure abbreviations used:

ppm - parts per million n - not detected % - percent - not analyzed

Mineral abbreviations used:

ba - barite gn - galena calc - calcite mag - magnetite chl - chlorite ml - malachite cp - chalcopyrite po - pyrrhotite ep - epidote py - pyrite qz - quartz sl - sphalerite td - tetrahedirite

Additional abbreviations:

dissem - disseminated fe-st - iron stained (rusty weathering) w/ - with