Veins of gold bearing quartz are well known in California, and historically they have produced millions of dollars worth of gold. Their formation and the gold they contain are of interest. Quartz mines are found and worked in a great many counties in California, from Siskiyou on the north to San Diego on the south.

The gold quartz veins in the vicinity of Grass Valley, Calif., have been actively mined since the fifties of the nineteenth century. Lindgren mapped the areal geology and studied the mines of the district in 1894, and the accompanying geologic map (pl. 1) is reproduced from his reports.

Gold deposits in two zones of mineralization, the East Belt and West Belt, flank the Mother Lode and occur 5 to 15 miles from it. The two belts are shorter and less continuous than the Mother Lode. Quartz veins of the East Belt cut a variety of rocks, and some of the richest deposits are veins in Jurassic granites.

Southwest of the Colorado dike is a banded quartz vein known as the Colorado vein. This vein, which is not known for crystalline gold but has been the source of high-grade gold ore, can be traced locally on the Mockingbird property.

More than three million ounces of gold have been produced from several geological terranes of the Eastern Klamath Mountains in the Redding, California 1x2 degree quadrangle. The most common lode-gold deposits are mesothermal-type quartz or quartz-carbonate veins which are hosted by a variety of rock types including meta-

The gold-quartz veins of California, in spite of many local variations, form a remarkably well defined type of mineral deposits, the salient characteristics of which it is intended to portray in this paper.

Although gold is found in many areas in California, the most productive districts are in the northern and central portions of the Sierra Nevada. The primary deposits usually consist of gold-quartz veins in metamorphic rocks and are associated with the intrusion of the Sierra Nevada batholith.

2018年7月3日 · In situ geochemical data were obtained for pyrite crystals and native gold from two distinct vein sets in the Grass Valley gold district, California. Samples of the N-S veins were collected underground at the Empire Mine State Historic Park and samples of the E-W veins were collected from drill core provided by the Idaho-Maryland Mining ...

2024年2月19日 · In the mid-19th century, gold rushes in California and Australia signified a striking relationship between gold and quartz, as the precious metal was frequently mined from quartz veins. During the California Gold Rush, starting in 1848, prospectors found gold embedded in quartz veins running through the Sierra Nevada mountains.

This chunk of vein quartz from Mariposa is typical of gold-quartz material from the mother lode district of California. In most gold ore, the gold is present in tiny specs, either within minerals like pyrite, or spread out free among the quartz. Normally even good, rich gold ore has no gold metal which is visible to the naked eye. The photo at ...