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Collection: Books and Periodicals > Nevada County Historical Society Bulletins

Volume 045-4 - October 1991 (8 pages)

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bead still contained silver, this silver was dissolved by the nitric acid. The gold was left as a black, spongy mass. This material was washed with distilled water, dried very carefully and heated again. This way, it regained ~ the appearance of normal gold. The resulting bead was weighed and, comparing this weight with the weight of the original bead, it could be determined how much gold and how much silver there was in the original sample. This again allowed to determine how much gold there was in one ton of ore; this was usually expressed as ounces per ton or the dollar value of gold per ton. = BULLION ROOM The furnace, retort and all equipment came from the Empire Mine. HYDRAULIC MONITOR \These giant "water cannons” were used to wash away entire mountains of gravel to extract the gold. This Monitor with a 500 foot head produces 5835 gallons of water per minute. 31 DYNAMITE PACKING MACHINE This machine was last used at the turn of the century to pack the explosive substance into the tubes to make a stick of dynamite. eas BLACKSMITH SHOP The blacksmith shop was not only the place where tools were repaired and often new equipment was made; its main function was to sharpen the drill bits. The drill bits were hauled into the mine in huge racks and after use, hauled back to the blacksmith shop to be resharpened. Asa bit lasted only about 15 minutes, 400 to 600 bits had to be sharpened every day at the Empire Mine.