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Mineral resource assessment of the Dillon 1 degree x 2 degrees Quadrangle, Idaho and Montana

Circular 1077

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Abstract

The Dillon 1°x2° quadrangle in southwestern Montana and east-central Idaho was investigated as part of the U.S. Geological Survey's Conterminous United States Mineral Assessment Program (CUSMAP) to determine its mineral resource potential. An interdisciplinary study was made of geology, geochemistry, geophysics (gravity and aeromagnetics), remote sensing, and mineral deposits. The results of those studies, as well as mineral resource assessment of numerous mineraldeposit types, are published separately as a folio of maps. This report summarizes the studies, provides background information on them, and presents a selected bibliography relevant to the geology and mineral resources of the quadrangle.

The quadrangle contains large resources of gold and substantial resources of talc and chlorite, all of which were being mined in the 1980's and early 1990's. Submarginal resources of molybdenum, copper, tungsten, and iron range from moderately large to large. Other commodities that may be present in significant amounts are chromite, lead, zinc, silver, barite, zeolite minerals, and various nonmetallic metamorphic minerals.

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Mineral resource assessment of the Dillon 1 degree x 2 degrees Quadrangle, Idaho and Montana
Series title:
Circular
Series number:
1077
Year Published:
1992
Language:
English
Publisher:
U.S. Government Printing Office
Publisher location:
Washington, D.C.
Contributing office(s):
Earth Resources Observation and Science (EROS) Center
Description:
iii, 15 p.