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Discussion—Stillwater, Montana Chromite Deposits

Edward Sampson
Edward Sampson
Department of Geology, Princeton University, Princeton, New Jersey
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January 01, 1969


Edward Sampson. In discussing Mr. Jackson's paper I should like to make a few remarks concerning mainly the Mountain View area. Before 1930 the group of rocks now known as the Stillwater complex has been described (Westgate, 1922) as an intrusive dike or sill invading a Precambrian complex and of Laramide age. In 1930 I recognized it as a complex closely similar to the Bushveld complex. Mr. Peoples and Mr. Howland, then graduate students at Princeton University, were assigned to work on the complex for doctoral dissertations. In 1936 a brief account (Howland et al., 1936) was published. Work continued until the outbreak of World War II under great difficulties as no adequate maps were available. A number of chemical analyses of carefully cleaned chromites were made. Then all information of Princeton University was turned over to the U. S. Geological Survey and Peoples and Howland joined the Survey staff.

Clearly crystal settling within the magma chamber is the controlling process (Fig. 1), although in certain places irregular intrusive relations are found as shown in Figure 2.

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Figures & Tables


Society of Exploration Geophysicists Geophysical Monograph Series

Magmatic Ore Deposits

H. D. B. Wilson
H. D. B. Wilson
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Society of Economic Geologists
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Publication date:
January 01, 1969




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