Bulletin . Photo No. 44. A battery (12 pipes) of Johnson-McKay retorts at the Klau mine,San Luis Obispo County. Retorts are, of necessity from their construction, limited in capacityand require more labor to treat a given tonnage than do shaft these reasons they can be profitably used only for relatively high-grade ores and concentrates. From the standpoint of the life of themine, it is doubtful economy in most cases to use them, as one mustgouge the high-grade ore for them. Some attempts have been madeto develop a continuous-feed retort. 216 CALIFORNIA STATE MINING BUREAU. The Fi


Bulletin . Photo No. 44. A battery (12 pipes) of Johnson-McKay retorts at the Klau mine,San Luis Obispo County. Retorts are, of necessity from their construction, limited in capacityand require more labor to treat a given tonnage than do shaft these reasons they can be profitably used only for relatively high-grade ores and concentrates. From the standpoint of the life of themine, it is doubtful economy in most cases to use them, as one mustgouge the high-grade ore for them. Some attempts have been madeto develop a continuous-feed retort. 216 CALIFORNIA STATE MINING BUREAU. The Fitzgerald furnace, a continuons-feed, inclined retort, wasdescribed by Forstner:^^. Photo No. 45. Livingston Furnace under construction at La Joya Mine,Napa County. This furnace consists of an inclined, arclied cliannel of flire-briclv (angle 35°)witli a tile floor. It has a charging hopper at the upper end and a discharge chamberwith door at the lower end. The flames from the fire chamber pass under this orechamber along two center flues, return along two outside flues, pass to the top of thearch of the lower end, and go from the upper end to the smoke-stack. The vaporsfrom the ore chamber are conducted through an iron exit pipe which is placed nearthe upper end of the ore chamber and is water-jacketed outside of the furnace, totwo condensers. In the second condenser an air current for is created by awater under 100 feet pressure, working on limestone to catch the flour capacity of each chamber is rated at 10 tons per 24 hours, using one cord ofpine wood. In practice the capacity is less. At the time of Forstners report (1903), three of


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