. Mining and Scientific Press . hat carry the entering cars of oreand fuel. Each furnace has a horizontal section at thetuyeres of !<• by 31 ft. and operates with a 17-ft. ore-column under a blast-pressure of 24 oz. The hearth is en-closed by 16 cast-iron water-jackets, set six on each sideand two at each end, each about 4 ft. high. A side-jackethas one 3-in. tuyere in its centre, and there is a total of1J tuyeres per furnace. The nominal daily capacity ofa lead-furnace is 100 tons; and this charge is handled by ., feeders and 1 1 wl lers on the feed-floor, and 2 toppers and 1 boss on the B
. Mining and Scientific Press . hat carry the entering cars of oreand fuel. Each furnace has a horizontal section at thetuyeres of !<• by 31 ft. and operates with a 17-ft. ore-column under a blast-pressure of 24 oz. The hearth is en-closed by 16 cast-iron water-jackets, set six on each sideand two at each end, each about 4 ft. high. A side-jackethas one 3-in. tuyere in its centre, and there is a total of1J tuyeres per furnace. The nominal daily capacity ofa lead-furnace is 100 tons; and this charge is handled by ., feeders and 1 1 wl lers on the feed-floor, and 2 toppers and 1 boss on the Blag-floor. The coke consumption is12% for American or 15% for the native product; theusual slag contains 33$ SiO„ 2895 CaO, and 28% FeO,with a ratio of I !a< I to FeO of 1 to 1. The slag is tappedintermittently into a steel fore-hearth, lined with adobebrick and set on wheels, whence it overflows into Nasmythslag-cars that are hauled by light steam-locomotives to the «lul\ 9, 192] \1I\!\<, AND S< II \i II b lRl SS. I I U> BLAST-FlRN Ml - \ T Mul; dump. Tin fore-hearth is 8 It. lonir. :u ft. high, inside itslining, and •! ft. wide at the base, hut only 2$ ft. wide attop t pi i niit quirt settling nt tin- matte, which is tappedfrom a side spout into cast-iron molds. Much of thebase bullion must be liquated on a small reverberatoryhearth before it is clean enough lor shipment, the result-ing Bcum being re-smelted. The first matte is passedthrough a jaw-crusher and rolls, and roasted down to asulphur content of 2 or 3, . After this it is re-smeltedwith silver ore. in two speeial blast-furnaces, one of 250and the other of 150-ton daily capacity. Before Tin-it ion of operations in 1914. the second matte was con-centrated in the blast-furnace, re-roasted, and chargedinto a small reverberatory. where, mixed with half itsweight of raw 60^c matte and silver ore, it was reducedand cast into anode copper for shipment to the Balbachrefinery at Newark. N. J. Since the rene
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