Bulletin . e romid. vertical, wood-stave chambers (see Photo No. 60, post). The stone condensers on thecoarse-ore furnaces were replaced by a large, rectangular wooden cham-ber, prior to the adoption of the round vertical form. The flues andstacks are of wood-stave construction (see Photo No. 26). The See pp. 223-225. post. ^Bradley. W. et al., Mines & mineral resources of Monterey et al. counties:Cal. State Min. Bur., chap, of State Mineralogists Report, 1915-i916, p. 73, 1917;leprinted in Report XV. p. 667 (in press). See p. 275, post. 118 CALIFORNIA STATE MINING BFREAU New Idria c
Bulletin . e romid. vertical, wood-stave chambers (see Photo No. 60, post). The stone condensers on thecoarse-ore furnaces were replaced by a large, rectangular wooden cham-ber, prior to the adoption of the round vertical form. The flues andstacks are of wood-stave construction (see Photo No. 26). The See pp. 223-225. post. ^Bradley. W. et al., Mines & mineral resources of Monterey et al. counties:Cal. State Min. Bur., chap, of State Mineralogists Report, 1915-i916, p. 73, 1917;leprinted in Report XV. p. 667 (in press). See p. 275, post. 118 CALIFORNIA STATE MINING BFREAU New Idria condensing- system is described in the section of the bulletinunder Metallurgy/ as is also the new rotary furnace. The furnacesare fired by crude oil; but in starting up a cold furnace wood is firstused before turning on the oil, until the fuel box is heated enough tokeep the oil vapor afire. This lessens the danger of back-firing, or theflame going out temporarily and tilling the furnace with gas. which. Photo No. 26. Blower and stack from fine ore furnace. New Idria Mine. would on the oil being re-lighted. Crude oil for fuel in liJlTcost .+)8 per barrel at the mine. A Brown recording and indicating electric pyrometer in theoffice of the furiiiUe foreman ccniiected into each of the tlu-ee olderfurnaces about iialf-way up. The following temperatures are main-tained: #1 at 600^^ (; #2 at 500^ C; #3 at 450^^ V. *See pp. 264-26f!, ijost.^See pp. 24S-:2r)0, ixist. QIICKSILVER RESOURCES. 119 Ore sizing. Ore l)rouoht out through #10 tunnel of the New Adria mine is firsttaken to the screen house where it is dumped onto a grizzly with Haperture. The oversize from the grizzly goes to No. 3 eoarse-orefurnace. The undersized is elevated to a revolving, wire screen whichmakes a segregation into 3 .sizes: +7/8 to IV which goes to No. 2coarsf-ore furnace: —7/8 to +1/8 which goes to the Scott fine-orefurnace: —1/8 which gi)es to the mill for concentration. Ore fr
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