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This report concerns work done partly on behalf of the U. S. Bureau of Reclamation and partly on behalf of the U. 8. Atomic Energy Commission, and is published with the permission of the Commission.

The principal skarn deposits are west of Radersburg and at Diamond Hill; titaniferous magnetite has been mined west of Radersburg. Perhaps as much as half the ore mined from the several types of vein deposits has been oxidized or partly oxidized; only a few veins have been profitably mined below the zone of oxidation. Despite extensive mining and prospecting, the area is considered favorable for discovery of additional mi.peral deposits. For example, auriferous py.rite veins or ancient gold •placers might be concealed beneath the relatively thin Cenozoic deposits south of the Keating and Ohio Keating mines near Radersburg, and the untested outwash gravels along and near Cold Springs Gulch would seem to warrant testing for gold. l L 1SEDIMENTARY ROCKS

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