The quicksilver resources of California . twent3-four hours; the ore remainsforty-eight hours in the furnace. While it is generally takenfor granted that ores carrjdng a great amount of metallicmercury can not well be handled in shaft furnaces, these twofurnaces in former j-ears gave verj satisfactory results whenburning the ore from the 1500-foot level, Randol shaft, whichcontained large quantities of native mercur5\ The charge con-sists of about 1600 pounds of ore. These two furnaces requiretwo men per shift, and burn each cord of wood per twenty-four hours. The cost of treatment per t
The quicksilver resources of California . twent3-four hours; the ore remainsforty-eight hours in the furnace. While it is generally takenfor granted that ores carrjdng a great amount of metallicmercury can not well be handled in shaft furnaces, these twofurnaces in former j-ears gave verj satisfactory results whenburning the ore from the 1500-foot level, Randol shaft, whichcontained large quantities of native mercur5\ The charge con-sists of about 1600 pounds of ore. These two furnaces requiretwo men per shift, and burn each cord of wood per twenty-four hours. The cost of treatment per ton is: Labor $ () Fuel (^) Total / \ » ti/L I \ $ . (i) :lrl£—5_. =$ (2) ^^^^ = K).3025 24 12 IRON CLAD SHAFT FURNACE (CONTINUOUS) SECTION A B ELEVATION. HORIZONTAL SECTIONS. Fig. 68. Exeli Furnace. Scale \i=i. 210 QUICKSILVER RESOURCES OF CALIFORNIA. Knox-Osborne Coarse-Ore Furnace.—This furnace was patentedin 1872. [See Fig. Formerl}- a number of these furnaceswere in use, but in later years their number has been greatlyreduced. One furnace is in use at the Manhattan mine (Knox-ville), and the old furnace at the Cerro Bonito mine, San BenitoCounty, has been renovated. [For description, see Egleston,above cited, page 841.] Some fine ore can be charged with the lump ore, but onlysparingly, other^ise it will choke up the passages between thelumps, through which the products of combustion of the fuelmust freely circulate. The inventor ob\dated this by addingsome pieces of wood to the fine ore when much of this materialwas contained in the charge, but this did not fully obviate thetrouble; and besides, the addition of fine ores materially reducesthe daily capacity of the furnaces. Consequenth, since thegeneral introduction of the t
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