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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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PLATE 1. Generalized geologic map of the Comstock-Indian Wells area __________________________________________ In pocket 2. Map showing paleogeography of older graveL _______________________________________________________ In pocket 3. Map showing subsidence areas in the Comstock-Indian Wells area __________________________________ --__ In pocket FIGURE 1. Index map showing Comstock-Indian Wells area and structural regions_____________________________________ K2 2. Map of Cretaceous paleogeographic and structural units__________________________________________________ 3. Isopach map of the Del Rio Clay______________________________________________________________________ 4. Isopach map of the Buda Limestone____________________________________________________________________ 5. Isopach map of the lower unit of the Buda Limestone____________________________________________________ 6. Photographs of the Boquillas Flags, showing bedding characteristics________________________________________ 7. Isopach map of the Boquillas Flags_____________________________________________________________________ 8. Photograph showing surface-related fold in lower unit of Buda Limestone___________________________________