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Weak lead-zinc mineralization was general in a narrow northwest-trending belt about 30 miles long in the southeastern part of the Lewis and Clark Range, Mont. Reconnaissance geological and geochemical studies identify the belt and indicate the stratigraphic and structural control of the mineralization; geophysical data permit inferences of the location of buried plutons that may have been the source of the metals. The mineralization appears to be spatially related to the South Fork thrust zone.doi:10.3133/b1252e fatcat:wybh5vxvlrggdcn6papfmddjxi