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Uranium minerals occur in a silver-bearing, cryptocrystalline silica vein deposit that cuts quartz monzonite and alaskite at the Free Enterprise mine, 2 miles west of Boulder, Mont. The Free Enterprise vein is one of many silicified reeflike structures in this area, most of which trend about N. 60° E. The cryptocrystalline silica veins commonly occur in groups having a lenticular pattern. Where quartz monzonite is the wall rock, they are bordered by an altered zone, but no alteration was noticed where alaskite is adjacent to the silica veins. These groups of silica veins and the enclosing altered country rock are called silicified zones in this report. No uranium minerals werei observed at the surface, but radioactivity anomalies were noted at 57 outcrbps. Leaching by downward percolating waters has removed most of the uranium from the near-surface part of the Free Enterprise vein and probably has slightly enriched parts of it and the adjacent wall rock from the bottom of the leached zone to the ground-water level. The quartz monzonite appears to be a more favorable host rock for this cryptocrystalline silica veins and associated uranium minerals than the alaskite. Alaskite occurs as vertical dikes and plug-like masses and as irregularly shaped, gently dipping masses. The smaller bodies probably were introduced into open fractures formed during the cooling of the quartz monzonite. The nature of the Free Enterprise deposit, the abundance of silicified veins, and the weak to moderate surficial radioactivity of some of these veins suggest that many small deposits of uranium and silver minerals may occur in this area in significant concentrations at relatively shallow depth. Cost of exploring and mining, however, might be prohibitive.

Geology of the area adjacent to the Free Enterprise mine, Jefferson County, Montana