 | | Report (issue) | | portion of the total production of gold. If fossil placers such as the Witwatersrand are included, more than...production and reserve grades source, fineness, mining methods, other economic commodities and general...is useful for analyzing the roles genetics and mining method have on placer grades and volumes. Deposits...spectrum of geologic and climatic settings. These placers have been previously classified in the literature...glacial-fluvial, bench, residual, Tertiary, and lake placers; many placers are described by several of these terms |  | | Report (volume) | | Geology of the Basin Quadrangle Jefferson, Lewis and Clark, and Powell Counties, Montana By EDWARD T. RUPPEL...1925Geology of the Basin quadrangle, Jefferson, Leis and Clark, and Powell Counties, Montana. Washington, U...119-121. 1. Geology Montana Basin quadrangle. 2. Mines and mineral resources Montana Basin quadrangle. I.... Title: Basin quadrangle. Montana. (Series) For sale by the Superintendent of Documents, U.S. Government...rocks_________________________________________ Lowland Creek volcanics-----___-_--._.__---------------_-Petrography |  | | Report (volume) | | ___________ Yukon River______ _________ Poorman Creek _____ Nowitna and Susulatna valleys ________ Heads...fish____ _ Other mining factors __________________________ Gold placers _ _ _ Ruby district _______________________________..._______________________________ History of mining ______________________ General character of placers________________..._ Ruby Creek_____________________________ Long Creek and tributaries _______________ Upper Sulatna River...Creek_____________________________ Flint Creek and tributaries __________________ Poorman Creek and vicinity _ __ ____________ |  | | Report (volume) | | GEOLOGICAL SURVEY GEOKGE OTIS SMITH, DIRECTOR THE GOLD PLACERS OF PARTS OF SEWARD PENINSULA, ALASKA INCLUDING...H. BROOKS__________________ DEVELOPMENT OF THE MINING INDUSTRY, BY ALFRED H. BROOKS_____ Foreword __...13 J9 24 28 Growth of mining from 1902 to 1904___________________ 31 Mining developments in 1905-6_...The future of the mining industry______________________ 135 DESCRIPTION OF PLACERS, BY ARTHUR J. COLLIER...gold________________-____-____ 140 Classification of the placers ________________________ 142 Introduction_____ |  | | Report (volume) | | ______________________________ Location and area of the district! _ _______________ Typography ________ __ ______...36 36 37 38 40 49 51 53 55 59 64 64 History of mining ____ 65 Economic conditions 68 3 4 CONTENTS...of placers_____ _________________ 74 Residual placers _______________ ,.__ 75 Origin ___ ________ __...___________________ 76 Stream placers. _ 77 Principal classes __ ___ __ 77 Snake River basin _____________ 77 Snake...Specimen and Nekula gulches________,____ 83 Glacier Creek- _______________^______ 84 Snow Gulch_______________________ |
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