Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 9, 2025
The principal mining towns are Camptonville, Timbuctoo, Foster's Bar, Texas Bar and Long's Bar. In 1859 there were nine quartz-mills in the county, three at Brown's valley, and one each at Camptonville, Dobbin's Ranch, Dry Creek, Honcut, Indiana Creek and Robbin's Creek. The assessor in 1860 reported only two quartz-mills in the county.
The methods of amalgamation differ very much, and a book might be filled with a description and discussion of the processes used at different quartz-mills in California. Sulphurets. Many auriferous quartz veins contain considerable quantities of sulphurets or pyrites of iron, copper and lead, and their presence prevents amalgamation, and thus causes a great loss of gold.
In many mills quicksilver is placed in the battery, two ounces of quicksilver for one of gold; and about two-thirds of the gold is caught thus. The copper plate in quartz-mills is made in the same manner as in placer-sluices, under which head a description of the plate may be found. Some amalgamating bowls or basins are little Chilean mills and arastras, made of cast iron.
Torrents of water bearing boulders, gravel, and sand, together with the particles of gold, are turned into sluice boxes lined at the bottom with quick-silver. This metal catches the gold and forms an amalgam as it does in the quartz-mills. There is a city hidden away in a narrow cañon in the extreme southern portion of Arizona which is supported solely by a copper-mine.
The pulverized sulphurets are decomposed by exposure to the air, and after the tailings have been preserved for a time, they may pay better at the second amalgamation than at the first. A mixture of common salt assists the decomposition of the pyrites. Chief Quartz-Mills. The most productive quartz-mill in the state is the Benton mill, on Fremont's Ranch, in Mariposa county.
Word Of The Day
Others Looking