Mineral Resources of Glacier Bay National Monument, Alaska

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, WASHINGTON : 1971 UNITED STATES DEPARTMENT OF THE INTERIOR FRED J. RUSSELL, Acting Secretary GEOLOGICAL SURVEY William T. Pecora, Director Library of Congress catalog-card No. 77--609011 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 ............................................................ Metallic commodities-Continued Previously known deposits ................................ Base and miscellaneous metals-Continued Nunatak molybdenum prospect ................ Arsenic ............................................................ Brady Glacier prospect ................................ Bismuth ........................................................... Fairweather Range ........................................ Cadmium ........................................................ Alaska Chief prospect ............................... Copper. ............................................................... Placer deposits near Lituya Bay ................ Distribution .............................................. Margerie prospect ........................................ Types of deposits .............................. Reid Inlet gold area and Sandy Cove pros- Descriptions of deposits ...................... pect ................................................................ Mount Young area ........................ Other previously known deposits ................ East of Casement Glacier ............ Deposits discovered during 1966 ........................ North shore of Adams Inlet ........ Geochemical anomalies .............................................. North of White Glacier ................ Favorable areas ............................................................ North of York Creek .................... Introduction .......................................................................... Minnesota Ridge ............................ Geographic setting ....................................................... Gable Mountain ............................ Previous investigations ................................................ South of Rendu Glacier ................ Present investigation .................................................. West shore of Tarr Inlet ............ Acknowledgments ........................................................ Margerie prospect ........................ Regional geology .............................................................. Curtis Hills ...................................... Stratigraphy ............................................................... North Marble Island .................... Intrusive rocks .............................................................. South Marble Island .................... Structure .......................................................................... Willoughby Island ........................ Geochemical studies ............................................................ Francis Island ............................... Methods of analysis ................................................... Alaska Chief prospect ................ Sampling and sample preparation .......................... East side of Dundas Bay ............ Anomalous and background values ............................ Bruce Hills ...................................... Total heavy metals ................................................ West of mouth of Rendu Inlet .... Copper .................................................................... South of Tidal Inlet ................... Lead ..................................................................... Blue Mouse Cove ...................... Molybdenum ............................................................ Southwest Gilbert Island and Chromium ................................................................ nearby unnamed island ............ Nickel ..................................................................... West of Shag Cove ........................ Other elements ...................................................... West arm of Dundas Bay ............ Unaltered rocks ........................................................... West of mouth of Tarr Inlet .... Causes of anomalous values ..................................... West of Tarr Inlet ........................ Results of geochemical studies ................................. North of Johns Hopkins Inlet .... Total heavy metals .................................... South of Johns Hopkins Inlet .... Copper ................................................................ East of Lamplugh Glacier... ........... Lead .......................................................................... Southwest of Lamplugh Glacier .. Molybdenum .......................................................... East of Reid Glacier .................... Chromium and nickel ........................................... East of Hoonah Glacier ......-........ Other elements ....................................................... Fairweather Range ........................ Areal descriptions .............................................. Southeast arm of Lituya Bay ...... Western Dundas Bay area ............................ Other deposits that contain Eastern Dundas Bay area ......................... copper .......................................... Miller Peak-Sandy Cove area ................... Lead ............................................................... Mount Merriam area .................................. Radioactive elements .................................... Reid Inlet gold area ................................ .. Tin ................................................................... Mineral deposits ............................................................... Zinc ................................................................. Locality list keyed to maps and tables ................... Distribution and types of deposits .... Metallic commodities .................................................. Descriptions of deposits ........................ Base and miscellaneous metals .......................... Nunatak on Casement Glacier .... Antimony ........................................................ Mount Brack .................................. CONTENTS 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 ........... Southwest of Alaska Chief pros- East of Brady Glacier .............. pect ............................ 55 Fairweather Range ....................... Hugh Miller Inlet ........................ 55 Placer deposits .............................. Mount Cooper 55 Chromium ........................................................ Northwest shore of Johns Hop- Cobalt ............................................................. kins Inlet .................................... 55 Manganese ...................................................... Other deposits that contain zinc .. 55 Molybdenum... .................................................... Precious metals ..................................................... 56 Dlstrlbutlon ............................................ Gold ................................................................. 56 Types of deposits .................................. Distribution and occurrence ................ 56 Descriptions of deposits ........................ Lode deposits .......................................... 56 Casement Glacier .......................... Reid Inlet gold area .................... 56 Van Horn Ridge ............................ Terry Richtmeyer prospect .... 56 West side of Tarr Inlet ................ LeRoy mine ............................ 56 Nunatak prospect .......................... Rainbow mine ........................ 59 Geology .................................... Sentinel mine .......................... 60 Ore deposits ............................ Monarch mines ..................... 60 Geochemical studies .............. Incas mine .............................. 62 Entrance of Adams Inlet .............. Sunrise prospect .................... 62 Wachusett Inlet .............................. Hopalong and Whirlaway Triangle Island .............................. claims ................................... 63 Geikie Inlet ...................................... Galena prospect ...................... 63 Lower Brady Glacier .................... Highland Chief prospect ...... 63 Ridge west of Rendu Inlet .......... Rambler prospect .................. 64 Other molybdenum deposits .. Other lode deposits in the Nickel ................................................................ Reid Inlet area .................. 64 Descriptions of deposits ........................ South of Lituya Bay ...................

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