Angels Camp District |
Gold Districts of California
Bulletin 193 California Division of Mines and Geology 1976
Table of Contents
Ore Deposit
The lode deposits consist of massive quartz veins, zones of parallel quartz stringers and bodies of mineralized schist and greenstone. The ore contains disseminated free gold and auriferous pyrite. Usually the gold is in fine particles, although occasional high-grade pockets containing coarse gold have been found. Calcite, talc, ankerite, and sericite, are commonly present in the ore. The milling-grade ore usually averaged 1/7 to 1/5 ounce of gold per ton, but the are bodies were scores of feet in thickness, hundreds of feet in length, and were mined to depths of several thousand feet.
The deposits occur either in the amphibolite and chlorite schist or phyllite. There are three principal vein systems (see fig. 7). In the system on the west the veins are in phyllite. In the center one the veins are along the west margin of a northwest-trending belt of metagabbro. In the eastern system, which contains the famous Utica mine, the ore deposits are in amphibolite and greenstone.
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