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Geology of the Straight Creek tunnel site, Clear Creek and Summit Counties, Colorado, and its predicted effect on tunnel construction
Charles Sherwood Robinson, Fitzhugh T. Lee
1962, Open-File Report 62-111
The purpose of this report is to present the preliminary results of the geologic and geophysical research conducted by the U. S. Geological Survey at the surface over the proposed Straight Creek tunnel. The results are interpreted and predictions are made, based primarily on statistical analyses, as to the probable...
Chromite in the United States, exclusive of Alaska and Hawaii
Thomas Prence Thayer, M. H. Miller
1962, Mineral Investigations Resource Map 26
The chromite deposits in the United States (exclusive of Alaska and Hawaii) are shown on the accompanying map. In compiling the map, the deposits were classified in five size categories according to the estimated total quantity of chromite present before mining. The map shows, by different symbols, deposits of chromite...