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Contract between Aurora Gold & Silver Mine and Bay State Quartz Mill Company, 1858

Currency:USD Category:Collectibles / Mining Start Price:100.00 USD Estimated At:200.00 - 500.00 USD
Contract between Aurora Gold & Silver Mine and Bay State Quartz Mill Company, 1858
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9 pages on folded blue lined paper. The Aurora Gold & Silver Mining Co. approves use of J.A. Bartoler's (? ) mill amalgamating patent for use by the Bay State Quartz Mill Company of American River. Also that they provide J. Chambers or agent with enough quartz from their ledges to process 10 tons per day. More is discussed. Please inspect for details. The Aurora Gold & Silver Co. was located on the west side or the Sierras and not to be confused with the town of Aurora later founded in 1861 and located in Nevada. The company was formed under the laws of New York State in 1858. The mill was located at American Bar on the American River and was considered one of the advanced and efficient at the time. In this was first introduced new methods of amalgamating and saving gold. Previously used processes were crude. No metallurgical studies were carried out and science was ignored, yet some people mined and milled with success. The innovations made at the Bay State Mill was the adoption of the “Chambers' Process," introduced by Judge Chambers, late of the banking house of Page, Bacon & Co. In this the quartz after being crushed under the stamps was ground still finer by mill-stones, then through amalgamating pans, with chemicals and quicksilver. The chemicals used were a secret to the inventor, and a large royalty was demanded for the use of the process, as it was patented. This was reported as saving from $80 to $130 per ton from the rock of a vein where only from $10 to $15 had been obtained by former methods. Date: Location: Placer County, California HWAC# 572075