Geology- In this district, slate is most abundant, but also present are sandstone, limestone, quartzite and conglomerates. In addition, there are greenstones and serpentine. The ore-deposits in this district consist of gold-quartz veins which occur in brecciated zones in all of the formations, but they are most abundant in the slates and greenstones. The ore contains free fold and varying amounts of sulfides, including arsenopyrite... Some of the veins and vein zones are 20 or more feet thick. An appreciable number of high-grade pockets were found. In places the placer deposits, both Teritary and Recent in age, were extremely rich.
Work Cited: “Gold Districts of California” Edition 193. William B. Clark. 1998
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Mosquito Creek, Brooklyn Mine