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Mineral Resources of Glacier Bay National Monument, Alaska

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Mineral Resources of Glacier Bay National Monument, Alaska Mineral Resources of Glacier Bay National Monument, Alaska GEOLOGICAL SURVEY PROFESSIONAL PAPER 632 Mineral Resources of Glacier Bay National Monument, Alaska By E. M. MAcKEVETT, JR., DAVID A. BREW, C. C. HAWLEY, LYMAN C HUFF, and JAMES G. SMITH GEOLOGICAL SURVEY PROFESSIONAL PAPER 632 A reconnaissance study of the mineral deposits and their geologic setting and a geochemical sampling program in one of our wildest, most beautiful, and most remote national monuments UNITED STATES GOVERNMENT PRINTING OFFICE, W ASH IN GTON : 1 97 1 UNITED STATES DEPARTMENT OF THE INTERIOR FRED J. RUSSELL, Acting Secretary GEOLOGICAL SURVEY William T. Pecora, Director Library of Congress catalog-card No. 77 609017 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 CONTENTS Page Page Abstract and summary _ . _ . 1 Mineral deposits Continued Mineral deposits _._.. _ _ ............ ........ 1 Metallic commodities Continued Previously known deposits -... .... ....._.... - 1 Base and miscellaneous metals Continued Nunatak molybdenum prospect ......... 1 Arsenic .- ...."...............-.. .....-... .... 39 Brady Glacier prospect ._____.. 3 Bismuth ................. ...... 40 Fairweather Range _ . _ _ 3 Cadmium ._...... ... 40 Alaska Chief prospect ... ................. 3 Copper 40 Placer deposits near Lituya Bay ................ 3 Distribution ........ - .... - 40 Margerie prospect ................. - ...........-. 3 Types of deposits ........ ... 40 Reid Inlet gold area and Sandy Cove pros­ Descriptions of deposits ........ 41 pect . __ ...._ ... - 3 Mount Young area 41 Other previously known deposits ................ 4 East of Casement Glacier ............ 41 Deposits discovered during 1966 ..... ... ....... 4 North shore of Adams Inlet - 42 Geochemical anomalies ............................................... 4 North of White Glacier ................ , 42 Favorable areas ................. ............-.-..-.. ... -.... 5 North of York Creek .............. 42 Introduction .......... 5 Minnesota Ridge 43 Geographic setting ............................ -_.. 7 Gable Mountain ... 43 Previous investigations .._.-......................-.....-... -.. .. 8 South of Rendu Glade- ............... 43 Present investigation ..... ...............................-.-.... 9 West shore of Tarr Inlet ... ...... 43 Acknowledgments ... ._ .................................. 9 Margerie prospect ................ ._.. 43 Regional geology .... ... ...................................................... 9 Curtis Hills . 44 Stratigraphy ..... _.._.___........................................._..... 10 North Marble Island ~ 44 Intrusive rocks ..............................-..-.. .....-........... .. 10 South Marble Island ......... ......... 44 Structure .___.. ... .._..._-.__... .. .. ... 11 Willoughby Island 44 Geochemical studies ........................ _........................... 11 Francis Island ...._ .. ..._....... 45 Methods of analysis .................................................. 12 Alaska Chief prospect . ... .... 45 Sampling and sample preparation ..... ~ 13 East side of Dundas I^y ...... 48 Anomalous and background values ......... ............. 13 Bruce Hills ....... .. ... ... 48 Total heavy metals ............................................... 13 West of mouth of Rendu Inlet .... 50 Copper . -. ................................................................ 13 South of Tidal Inlet . ...-...... 50 Lead ....................... - ._.. ... .. .. 13 Blue Mouse Cove ._ .. 50 Molybdenum ........................................-...._.___. 13 Southwest Gilbert Island and Chromium ........................................-.-........ ........ 13 nearby unnamed island ............ 50 Nickel ..................................................................... 13 West of Shag Cove ....................... 51 Other elements ................ ..._.. ..._.. .._... ... .. 14 West arm of Dundas Fiy ............ 51 Unaltered rocks .... ................................ ......... ....... 15 West of mouth of Tarr Inlet .... 51 Causes of anomalous values .................. ................ 15 West of Tarr Inlet -.....- ...... 51 Results of geochemical studies ................................. 15 North of Johns Hopkins Inlet .... 51 Total heavy metals ............. .... ... ........ ......... 16 South of Johns Hopkirs Inlet .... 52 Copper ... .................................. ........................... 16 East of Lamplugh Glacier...... 52 Lead ............-...-....._.-...............-...............-....-.......... 16 Southwest of Lamplugh Glacier .. 52 Molybdenum ............................................. _..___._... 17 East of Reid Glacier ..-... ..... 52 Chromium and nickel .................._._.._..._... ._ 17 East of Hoonah Glacier ..... 52 Other elements ....................................... ............. 17 Fairweather Range ... 52 Areal descriptions . .... ....................................... 17 Southeast arm of Lituya Bay ... 53 Western Dundas Bay area . ..................... 17 Other deposits that contain Eastern Dundas Bay area ........................ 20 copper . .... ....... 53 Miller Peak-Sandy Cove area ................... 20 Lead ... ...... ........._. .................-..._. ... 53 Mount Merriam area . ................................. 22 Radioactive elements ..._ 54 Reid Inlet gold area ............ .................. 22 Tin ......... ._._..--......-..._.-... -_-..--.-.. 54 Mineral deposits . .. .... ...-.........-..... ..... ................ 22 Zinc . _. 54 Locality list keyed to maps and tables ................ 25 Distribution and types of deposits .... 54 Metallic commodities ............... 29 Descriptions of deposits 54 Base and miscellaneous metals ........._................ 29 Nunatak on Casement Glacier .... 54 Antimony _.. 29 Mount Brack _.__ ........................_ 54 III IV CONTENTS Page Page Mineral deposits Continued Mineral deposits Continued Metallic commodities Continued Metallic commodities Continued Base and miscellaneous metals Continued Iron and ferroalloy metals Continued Zinc Continued Iron Continued Descriptions of Descriptions of deposits Continued deposits Continued Southwest of Red Mountain 55 West of Blackthorn Peak ............ 72 Southwest of Alaska Chief pros­ East of Brady Glacier .._.. _ ... 72 pect . -.-._.-..- ._.___._.__-_____ 55 Fairweather Range ...................... 72 Hugh Miller Inlet .._......_...___. 55 Placer deposits .._. .._. .. ...__ 73 Mount Cooper ............ .-...._ ____ 55 Chromium ____________. __. _ __ _ ______ . _._____ 73 Northwest shore of Johns Hop- Cobalt ._. ...__ .._.. _......_.._______.. 73 kins Inlet - .-_ -_.-_ ..._. 55 Manganese -.. ....... .. ...... _.._.. ._ . 73 Other deposits that contain zinc __ 55 Molybdenum __.._...._ ._._.____. ________________ 73 Precious metals _. _______..._.-.-..._-_._._________.-_________....- 56 Distribution .___ _ __ . ___ _ 73 Gold ....._. _...._.._.._....._...__._...._......_...... 56 Types of deposits . .____ _ ___ _ ___ 73 Distribution and occurrence 56 Descriptions of deposits .... ._______________ 74 Lode deposits ___._..__ _.______. _ 56 Casement Glacier ...... ..._ __-_-_... 74 Reid Inlet gold area ______._ 56 Van Horn Ridge ______.. ___..-.. ____ 74 Terry Richtmeyer prospect . 56 West side of Tarr Inlet .._..___._.__. 74 LeRoy mine _____ .. 56 Nunatak prospect -- ______________._______ 74 Rainbow mine ...__. 59 Geology ..__.... __....._.____._..______ 74 Sentinel mine _._______ __ ___ 60 Ore deposits __.__ . ... ._._- 75 Monarch mines -____ ... .__ 60 Geochemical studies _ ______-_ 77 Incas mine ______-._____ .._.__..... 62 Entrance of Adams Inlet ___ __...._ 78 Sunrise prospect _____ 62 Wachusett Inlet _. __. _ _ 78 Hopalong and Whirlaway Triangle Island . ._- _..____.-......-___ 78 claims . _ __ ... 63 Geikie Inlet __..-_......__ __._. 78 Galena prospect ...- ._...... 63 Lower Brady Glacier .........__.... 79 Highland Chief prospect 63 Ridge west of Rendu Inlet .......... 79 Rambler prospect _ __.._ 64 Other molybdenum deposits ........ 79 Other lode deposits in the Nickel -.__- .. ____ _ _ 79 Reid Inlet area _._ ..... 64 Descriptions of deposits .. ...-.__ __.... 79 South of Lituya Bay ______..___.-.____ 64 Brady Glacier prospect, by F, R. Sandy Cove prospect _.______......__. 64 Cornwall ..__._..___.....___ ____ . 79 West of McBride Glacier _.-. .. 66 Geology ._._... ... 80 East of lower Brady Glacier ......_. 67 Ore deposits . .___ .........._____ 81 West of Dundas Bay __.__ ...__ ... 67 Possibilities of commercial Russell Island __-_ _..___..-___- ___________ 67 ore deposits ._._ ..... _. 81 Other lode deposits ___.__. ..... 67 Titanium ______ ... ___ _____.._.. __................ 82 Placer deposits ...- ._ _-_.___ -...... 67 Distribution _ _ .__....._.____..._____ _........... 82 South of Wood Lake _______._...._..__. 67 Descriptions of deposits ...._.... .. .. 82 Dundas River - _ .. 67 Fairweather Range . .___ . ..._ 82 Outwash of Brady Glacier ....-. 67 Placer deposits near Lituya FT .. 83 Oregon King Consolidated __________ 67 Tungsten .... ___________ ....... ...__. ................ 83 Lituya Bay ._____.___.._______._.... .__..______ 68 Vanadium ______________ __ ...____ 84 Other placer deposits ........ 68 Geologic influences on localization of metalli­ Platinum - . _-. _ .._._ .__________ 69 ferous deposits __... ____.........-.... ..... ... .. .... 84 Silver ___ _.-..-..._..___._______...__....______. .............. 69 Nonmetallic commodities ..._...._________-......_._.-.__._ 84
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