Chromite Deposits in Central Part Stillwater Complex, Sweet Grass County, Montana

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Description

From abstract: The chromite deposits of the central part of the Stillwater complex lie in a belt 9 miles long between the valleys of Boulder River and the West Fork of the Stillwater River in Sweet Grass County, Mont. The chromite occurs as layers near the middle part of the ultramafic zone in the lower part of the complex. The layers, originally horizontal, have been tilted so that they dip northeastwards at angles ranging from nearly horizontal to nearly vertical, and are cut by many cross faults, the largest with a horizontal offset of 3,000 feet. Investigations by the United ... continued below

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iv, 99-122 p. : maps, charts ; 23 cm.

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Howland, A. L. 1955.

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Description

From abstract: The chromite deposits of the central part of the Stillwater complex lie in a belt 9 miles long between the valleys of Boulder River and the West Fork of the Stillwater River in Sweet Grass County, Mont. The chromite occurs as layers near the middle part of the ultramafic zone in the lower part of the complex. The layers, originally horizontal, have been tilted so that they dip northeastwards at angles ranging from nearly horizontal to nearly vertical, and are cut by many cross faults, the largest with a horizontal offset of 3,000 feet. Investigations by the United States Geological Survey and the United States Bureau of Mines have shown that in this belt there are 5 sections ranging in length from 850 to 3,800 feet along the strike where the continuity and grade of the chromite can be reasonably inferred.

Physical Description

iv, 99-122 p. : maps, charts ; 23 cm.

Notes

"A Contribution to Economic Geology."

"A description of layered deposits of chromite in the untramafic rocks, and an estimate of their commercial importance."

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Technical Report Archive and Image Library

This selection of materials from the Technical Report Archive and Image Library (TRAIL) includes hard-to-find reports published by various government agencies. The technical publications contain reports, images, and technical descriptions of research performed for U.S. government agencies. Topics range from mining, desalination, and radiation to broader physics, biology, and chemistry studies. Some reports include maps, foldouts, blueprints, and other oversize materials.

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  • 1955

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  • Jan. 27, 2017, 10:19 a.m.

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  • Feb. 27, 2017, 12:35 p.m.

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Howland, A. L. Chromite Deposits in Central Part Stillwater Complex, Sweet Grass County, Montana, report, 1955; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc304274/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.