Identifier: bulletin78cali (find matches)
Title: Bulletin
Year: 1905 (1900s)
Authors: California. Division of Mines and Geology California. State Mining Bureau. Bulletin
Subjects: Mines and mineral resources Geology
Publisher: San Francisco (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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eated rock drawn off too soonfrom below, there will be values remaining in it. If the rock be stillhot enough for any remaining mercury to volatilize, such remainingmetal might escape into the air, and an assay of the tailings mightthereby indicate a clean extraction, though obviously not a cleanrecovery. That this is not only possible, but sometunes does occur, isshown by the fact that the draw-man generally wears some sort of noseand throat protection, and sometimes they have been salivated, thoughnot often. The investigations of the U. S. Bureau of )\Iines have shown the stackfume losses to be much smaller than it had been expected to find them. Heberlein, C. A., The mining and reduction of quicksilver ore at the Oceanic mine.Cambria, Cal. : Bull. Am. Inst. Min.. Eng., Feb., 1915, p. 500. Also, in Trans., Vol. LI,p. 113. Castek, Franz, Die Bestlmmung und Verminderung der Verluste beini Queck-silbwhiittenwesen: Berg- u. Huttenmannisches Jahrbuch, LVIII, Band, Wien, 19.10. 16—38540
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QUICKSILVER RESOURCES. 243 At New Idria, on O.l/i ore, the loss was but 4^ i)ouirIs of quicksilverper 24 hours treating 75 tons of ore. At the Oceanic mine, on 0.3%ore, it was 6^ pounds, treating 90 tons. While top, stack, and dischargelosses are controllable to a greater or less extent, there is one form ofloss, that of absorption, which is impossible to measure and practicallyimpossible to control where brick or stone are iised in the constructionof furnace and condenser walls. The Scott fine-ore furnace with itsusual system of brick condensers is notorious for its hoarding up ofabsorbed quicksilver. Of course, it is not an ultimate loss, as it cansome day be recovered by wrecking the plant; but to all intents and pur-poses, as long as it remains there, it is a loss. One superintendent whostill very much favors the Scott furnace recently made this observationto the writer: If you will take the recovery of absorbed mercury fromthe wrecking of a given plant, and divide it by the numbe

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