. First century of national existence; the United States as they were and ilurian rocks, dipping with them at ja very steep angle, and winding with the 1contortions of the strata. The workingsfollow the bunches of ore as they lead up ordown, and to the right or left. Shafts occa-sionally penetrate from one level to another,bnt no regular system of working appears tohave been adopted. With the cinnabar isintermixed some arsenical iron and copperpyrites, and the ore and slates are both trav-ersed by veins of carbonate of lime, someof which are retained in hand specimens ofthe cinnabar. On
. First century of national existence; the United States as they were and ilurian rocks, dipping with them at ja very steep angle, and winding with the 1contortions of the strata. The workingsfollow the bunches of ore as they lead up ordown, and to the right or left. Shafts occa-sionally penetrate from one level to another,bnt no regular system of working appears tohave been adopted. With the cinnabar isintermixed some arsenical iron and copperpyrites, and the ore and slates are both trav-ersed by veins of carbonate of lime, someof which are retained in hand specimens ofthe cinnabar. On the same range of hills, at its westernextremity, the Santa Clara Mining Company,of Baltimore, has opened a mine called theGuadalupe, the product of which for theyear 1860 was about 200,000 lbs. The total prwluction of the quicksilvermines, from the beginning of 1853 to theclose of 1858, was about 177,578 flasks, or13,318,350 lbs. In 1866, the Californiamines produced 3,505,878 lbs, and in 1867,3,810,957 lbs. Litigation has preventedmost of them from being fully worked. 7- ~. lU MINING INDUSTRY OF THE UNITED STATES. METALLURGIC TREATMENT. From cinnabar not contaminated withstrange metals, the method of obtaining thefluid mercury is very simple. In the earlyworkings of the New Almaden mine, theclean ores were placed in the common trypots, such as are used by the whalers, anda cover being tightly luted on, a fire wasstarted under them, and the mercurial vaporsescaped through a tube inserted in the lidand were condensed in cold vessels. After-ward furnaces were constructed in brick-workupon a large scale, each one provided with achaml)or or oven 7 feet long, 4 feet wide, and5 feet high, corresponding to the chamberof the revcrberatory furnaces ; and into thiswas introduced a charge of 10,000 lbs. ofclean ore separated from tlie poorer portionsafter the whole had been broken up. Withthe ore was mixed a portion of lime to com-bine with and retain the sulphur. A parti-tion of hrick-
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Keywords: ., bookauthorhodgejam, bookcentury1800, bookdecade1870, bookyear1874
