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Mineral Resources of the Mission Mountains Primitive Area, Missoula and Lake Counties, Montana By JACK E. HARRISON, MITCHELL W. REYNOLDS, and M. DEAN KLEINKOPF, U.S. GEOLOGICAL SURVEY, and ELDON C.

B. Smith is with the Division of Mineral Resources, Montana State Geological Survey. E. E. McGovern is with the Division of Geology, University of Montana. G. L. Tull is L. Smith is the director, Bureau of Mines, Bureau of Minerals, United States Department of the Interior Washington The Mission Mountains, comprising three distinct groups, the Mission, Upper, and the St. Elias, are situated west of Yellowstone, south of Great Falls, east of the Mississippi River, and north of the Yellowstone River and the Missouri River. These mountains are characterized by the abundance of basalt, an important thermal igneous unit; extensive hydrothermal systems of hydrothermal orebodies; and a diversity of igneous rocks. The Mission Mountains are composed of three geological districts: (1) the Upper Mission (2) a portion of the St. Elias (3) the southern portion of the Western (Prairie) Mission. The upper Mission includes an estimated 70,000,000 – 100,000,000 cubic feet (7,200 – 8,800) feet (10,300 – 13,400 tonnes) of basalt, or the equivalent of one million cubic yards (2.5 million cu. m.) of basalt. The upper-Mission consists of a series of limestone domes, composed chiefly of disease and calcite; it has four of its four major peaks more than 60 feet (18 meters) above sea level. The mission and the lower Mission are separated by a large and prominent granite ridge, a few degrees south of latitude 45º N. The lower- Mission includes the lowermost of the three major peaks, Mount Riddle. This, and two minor peaks, Mount Shambles and Mount McKinney, are concentrated in a basin that includes most of the lower section of the mountains. The principal orebodies found in the Mission Mountains are the greater Yellowstone Caldera and the upper-most parts of the upper basin and overlapping portions of the lower basin. Ore is transported principally by wind, by water, and by springs; and, in areas where the soil is soft, the minerals are carried by rain, snow, or occasionally by the fall of precipitation upon the soils.

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