Abstract
. Autunite and other uranium minerals were discovered in by Pratt Seegmiller about 3i miles north of Marysvale, Piute County, Utah^ Mining operations were begun in the summer of 1949 by the Vanadium Cprporation of America on the Prospector and the Freedom claims, and by the Bullion Monarch Mining Company at the Bullion Monarch claims. These claims were examined briefly in December 194-9 and i^imary 19£0 by the Yjriterso The uranium deposits of the Marysvale district are in northeasterly striking fault zones in quartz monzonite that intrudes rocks of -^he ' older11 Tertiary volcanic sequence. Flows and tuffs of the 'younger11 Tertiary volcanic sequence unconformably overlie the earlier rocks^ Autunite, torbernite, ur,anophane ? schroeekingerite, and at least one unidentified secondary uranium mineral occur in the upper parts of the depositSo Pitchblende has been mined from the underground workings of the Prospector No. 1 mine. The 'uranium minerals are associated with dense quartz veins and intensely argillized wall rock. In the upper parts of the deposits pyrite is completely oxidized. The secondary uranium minerals probably were formed by the alteration of primary pitchblende by circulating meteoric waters*
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