Bulletin . en driven clear through the ridge, and is 1080 long. AFord motor is used for hauling to the aerial tram bin. Raises aredriven at various points up under the dumps on the surface. It isintended to quarry off the entire top of the hill down to #2 level. Theore being sent from here to the furnaces in September. 1917. was aver-aging about , mercurv. 116 CALIFORNIA STATE MINING BUREAU, The ore from the San Carlos mine is transported to the reductionworks by a Painter aerial tramway, 2 miles long, with a drop of 2130between terminals, and its operation is controlled by brakes at theup
Bulletin . en driven clear through the ridge, and is 1080 long. AFord motor is used for hauling to the aerial tram bin. Raises aredriven at various points up under the dumps on the surface. It isintended to quarry off the entire top of the hill down to #2 level. Theore being sent from here to the furnaces in September. 1917. was aver-aging about , mercurv. 116 CALIFORNIA STATE MINING BUREAU, The ore from the San Carlos mine is transported to the reductionworks by a Painter aerial tramway, 2 miles long, with a drop of 2130between terminals, and its operation is controlled by brakes at theupper end. There are 30 buckets of 1000 lb. capacity, each. Lock-coilsteel cables are used, the track rope on the loaded-bucket side being1 1/8 diam., on the empty side 7/8 diam., and the traction or pullingrope 5/8 diam. An automatic, track oiler is passed over the line onceevery 5 days, spreading crude fuel-oil on the cable. The buckets areheld onto the traction rope by a grip which is attached and detached. Photo No. 25. San Carlos Mine, open cut above No. 2 level. Recovering dump material and old pillars. automatically at the terminals. The l)uckets are dumped by capacity of the tramway is 20 tons of ore per hour, and it is oper-ated two 8-hour .shifts dailv. REDUCTION EQUIPMENT. The reduction equipment of the New Idria Company has been under-going rapid and vital changes during the past year, and otherimportant developments are in comtemplation ; so that by the time thisreport comes fi-om the ])rinter, the ])hotographs and flow-sheet repro-duced herewitli will not in all details truthfully portray the installation QnCKSIIAER RESOURCES. 117 and practice as they may exist at that moment. However, are here recounted to show the present status, and to recordthe of the developments. At the present writing (April,1918.) the reduction equipment includes a concentrating mill, twoIdria coarse-ore furnaces of SS tons daily capacity, a 60-ton Scott fine-
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