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View article: Rivers of gold; placer mining in Alaska
Rivers of gold; placer mining in Alaska Open
of Gold Placer Mining in Alaska O f all the gold ever mined in the world, approximately 1 to 2% (more than 33 million ounces) has come from Alaska.Seventy-two percent of this Alaskan gold was mined from placer deposits gold accumulations i…
View article: Gold placers of the historical Fortymile River region, Alaska
Gold placers of the historical Fortymile River region, Alaska Open
From introduction: This report focuses on the placer geology of individual creeks; mining, history of the area, high terrace gravels, and the gold source of the Fortymile River area in Alaska.
View article: Gold placers of the Circle District, Alaska — Past, present, and future
Gold placers of the Circle District, Alaska — Past, present, and future Open
Geology 3Bedrock 4 Granite 5 Quartzite and quartzitic schist
View article: Metalliferous mineral resource assessment maps of the Mount Hayes Quadrangle, eastern Alaska Range, Alaska
Metalliferous mineral resource assessment maps of the Mount Hayes Quadrangle, eastern Alaska Range, Alaska Open
This report assesses the metalliferous mineral resources of the Mount Hayes quadrangle based on extensive geologic, geochemical, and geophysical investigations, and on investigations of mineral deposits, prospects, and occurrences.The asse…
View article: Gold in placer deposits
Gold in placer deposits Open
Man most likely first obtained gold from placer deposits, more than 6,000 years ago. Placers account for more than two-thirds of the total world gold supply, and roughly half of that mined in the States of California, Alaska, Montana, and …
View article: Metallogeny and major mineral deposits of Alaska
Metallogeny and major mineral deposits of Alaska Open
This report is a preliminary version of a chapter for the volume on Alaskan geology
View article: Significant metalliferous lode deposits and placer districts of Alaska
Significant metalliferous lode deposits and placer districts of Alaska Open
From preface: "This report is a compilation of the significant metalliferous lode deposits and placer districts of Alaska, and is a comprehensive data base for a companion article on the metallogenesis and major mineral deposits of Alaska …
View article: Geology and geochronology of the Healy quadrangle, Alaska
Geology and geochronology of the Healy quadrangle, Alaska Open
The Healy quadrangle Is underlain by a wide variety of sedimentary, volcanic, and plutonic rocks, ranging In age from Precambrlan and (or) early Paleozoic to Recent.There are fifty five map units on the geologic map.All the pre-Cenozolc ro…
View article: Mineral resources of the Palen-McCoy Wilderness Study Area, Riverside County, California
Mineral resources of the Palen-McCoy Wilderness Study Area, Riverside County, California Open
The Palen-McCoy Wilderness Study Area (CDCA-3Z5) is an area of about 81,000 acres located 20 mi west-northwest of Blythe and 15 mi east of Desert Center in the Mojave Desert of southeastern California.Geologic, geochemical, geophysical, an…
View article: Mineral resources of the North Algodones Dunes Wilderness Study Area (CDCA-360), Imperial County, California
Mineral resources of the North Algodones Dunes Wilderness Study Area (CDCA-360), Imperial County, California Open
The potential for undiscovered base and precious metals, and sand and gravel within the North Algodones Dunes Wilderness Study Area is low.The study area has a moderate potential for geothermal energy.One small sandfree area between the Co…
View article: Mineral resources of the North Algodones Dunes Wilderness Study Area (CDCA-360), Imperial County, California
Mineral resources of the North Algodones Dunes Wilderness Study Area (CDCA-360), Imperial County, California Open
This report presents the results of a mineral survey of the North Algodones Dunes Wilderness Study Area (CDCA-360), California Desert Conservation Area, Imperial County, California. The potential for undiscovered base and precious metals, …
View article: Mineral resources and mineral resource potential of the Kelso Dunes Wilderness Study Area (CDCA-250), San Bernardino County, California
Mineral resources and mineral resource potential of the Kelso Dunes Wilderness Study Area (CDCA-250), San Bernardino County, California Open
Geologic, geochemical, and geophysical evidence, together with a review of historical and modern mining and prospecting activities, indicates that the Kelso Dunes Wilderness Study Area contains an estimated 16 billion tons of marginal glas…
View article: Mineral resource assessment of the Circle Quadrangle, Alaska
Mineral resource assessment of the Circle Quadrangle, Alaska Open
A large number of colleagues at the U.S. Geological Survey assisted in completing the report.Terry Keith provided petrographic and x-ray diffraction analysis of samples of altered rocks.Discussions with B. L. Reed and G. D. Eberlein about …