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Geology and ore deposits of the Casto quadrangle, Idaho
Clyde P. Ross
1934, Bulletin 854
The study of the Casto quadrangle was undertaken as the first item in a project to obtain more thorough knowledge of the general geology of southcentral Idaho on which to base study of the ore deposits of t he region. The quadrangle conta ins fragmentary exposures of Algonkian and Paleozoic...
Metalliferous deposits of the greater Helena mining region, Montana
Joseph Thomas Pardee, F. C. Schrader
1933, Bulletin 842
The ore deposits described in this bulletin are distributed through a region of about 3,000 square miles surrounding the city of Helena, Mont. In general the surface of this region is mountainous, but it includes several large intermontane valleys. Large areas in the northern and eastern parts of the region...
Geology and ore deposits of the Pioche district, Nevada
L.G. Westgate, Adolph Knopf
1932, Professional Paper 171
LOCATION AND SURFACE FEATURES The Bristol Range, Highland, and Ely Range quadrangles make up the larger part of a. rectangular area 35 miles north and south by 24 miles east and west, which lies 19 miles west of the Nevada-Utah line and about 250 miles southwest of Salt Lake...
The copper deposits of Michigan
B. S. Butler, W. S. Burbank
1929, Professional Paper 144
The copper district of Keweenaw Point, in the northern peninsula of Michigan, is the second largest producer of copper in the world.  The output of the district since 1845 has been more than 7,500,000,000 pounds and showed a rather steady and consistent increase from the beginning of production to the...
Organic precipitation of metallic copper
T. S. Lovering
1927, Bulletin 795-C
Spongy masses of native copper, found in a bog near Cooke, Mont., are believed to have been precipitated by organic matter. Their occurrence and field relations are such as sharply limit speculations concerning their origin....
Geology and ore deposits of the Tintic mining district, Utah
Waldemar Lindgren, G. F. Loughlin, V. C. Heikes
1919, Professional Paper 107
Tintic, Park City, and Bingham have always been the three great silver-lead producing districts of Utah. Of late years Bingham has also become one of the most prominent copper districts of the world, and Tintic has likewise entered the ranks of the great copper camps....