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. Introduction  . Purpose and Scope of Studies  . Location and Geography  . Mining History  . Previous Studies  . 1 1 1 2 3 5 Present Investigations . . . . . .. . . . .. . . .. . . . . . . . . . . . . . . . . .. . . . . . . . .. . . . . . . . .. . .  .. . . . . . . . .. . . . . . . . . .. . . . . . . .. . . . . . . . .. 6 Descriptions of Maps and Results of the Butte Cusmap Project 6 Geologic Maps (OF-86-292, MF-1925)  6 Geochemical Maps and Data (OF-82-0617-A to I, USGS-GD-85-006) 8 Gravity and Magnetic Anomaly Map (1-2050-1) 8 Limonite and Hydrothermal Alteration Map (1-2050-A)    9 Linear Features Associated with Metal-Bearing and Prospects Map (1-2050-B)  9 Mines and Prospects Map (1-2050-C)        10 Mineral-Resource Assessment Maps (1-2050-D, E, F, G, and H) 10 References Cited and Selected Bibliography for the Butte 1 °X2° Quadrangle 13

u.s. geological survey circular/u.s. geological survey circular

The Conterminous United States Mineral Assessment Program; background information to accompany folio of geologic, geochemical, remote sensing, and mineral resources maps of the Butte 1 degree x 2 degrees Quadrangle, Montana