Report of the State Mineralogist . The present cost, judged by result of their last operationsFind cost at similar properties nearby, would be very close to $7 a November 1,1920, the crosscuts on the lower levels had not developedore that could be profitably treated at such cost. Thirty men wereemployed; the full crew is 120. AMADOR COUNTY. 409 The mill contains 40 stamps, 24 Frue vanners, 5 Deister Overstromconcentrators and a 5 ft. x 6 ft. Hendy ball mill. Mill practice con-sisted of stamping and amalgamation, followed by concentration onthe Deister tables, after which the sands were
Report of the State Mineralogist . The present cost, judged by result of their last operationsFind cost at similar properties nearby, would be very close to $7 a November 1,1920, the crosscuts on the lower levels had not developedore that could be profitably treated at such cost. Thirty men wereemployed; the full crew is 120. AMADOR COUNTY. 409 The mill contains 40 stamps, 24 Frue vanners, 5 Deister Overstromconcentrators and a 5 ft. x 6 ft. Hendy ball mill. Mill practice con-sisted of stamping and amalgamation, followed by concentration onthe Deister tables, after which the sands were ground in the Hendymill and the entire pulp was concentrated on the Frue vanners. Millcapacity is 200 tons a day. Cost of treatment was reported to be 25^a ton in 1914 and over twice as much in 1920. Electric power is usedthroughout. The Central Eureka Mine at Sutter Creek is producing being operated at a loss for many years, during which 48 assess-ments were levied and only low grade ore was found, the courage and. Photo No. 52. View of Mother Lode District in Amador County, showing (1) in right fore-ground, Bunker Hill Mill; (2) in center, the Treasure Mine; and (3) in left back-ground, the headframe of the Fremont Mine. perseverance of the stockholders of the Central Eureka were rewardedby the finding of very good ore in considerable quantity on the lowerlevels. The workings have now (November, 1920) reached a depthof 3900 ft. During the past year and a half the ore has been comingfrom the stopes of the 3500, 3600, and 3700 ft. levels, with a littlefrom the 3350-ft. level. Geological conditions have proved puzzling in the Central Eureka,and recent success has been due in large measure to the active explora-tory work directed by Superintendent Howe. Exploration of the eastand west country, which was recommended by C. E. Julihn in 1917after the retiring directors had concluded the mine was exhausted,was first put in effect that year. An east crosscut was driven
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
