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165623 results.

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Publication Extents

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Geologic reconnaissance of possible powersites at Spur Mountain, Tyee, and Eagle lakes, southeastern Alaska
James E. Callahan, Alexander Andrew Wanek
1967, Open-File Report 67-35
Spur Mountain, Tyee, and Eagle Lakes fill glacially scoured bedrock basins in the Coast Range of southeastern Alaska. The bedrock consists of granitic intrusive rocks and high rank metamorphic rocks associated with or resulting from emplacement of the Coast Range batholith.Spur Mountain damsite is underlain by granodiorite and diorite. The...
Geophysical ore guides along the Colorado mineral belt
James E. Case
1967, Open-File Report 67-39
A 40-50-mgal gravity low trends northeast along the Colorado mineral belt between Monarch Pass and Breckenridge, Colorado. The low is probably caused by a silicic Tertiary batholith of lower density than adjacent Precambrian crystalline rocks. Many major mining districts associated with silicic Tertiary intrusives are near the axis of the...
Phosphate rock in Colombia - a preliminary report, with a section on the phosphate occurrence at Turmeque
James Bachelder Cathcart, Francisco Zambrano O., Pedro Mojica G.
1967, Open-File Report 67-43
Exploration for phosphate rock in Colombia was successfully carried out in 3 1/2 months by the U.S. Geological Survey and the Inventorio Minero of the Servicio Geologico Nacional, under the auspices of the U.S. Agency for International Development. A modern theory of exploration based on model studies of phosphorite deposits...