The Metallurgy of Gold
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Z. * The ore in this district may be regarded as on the border line between "refractory" and "free-milling" ores. It varies greatly in hardness and composition, and consists of "stringers" of quartz running through a more or less decomposed and brecci- ated hornblende-andesite. The gold is often in visible specks and threads in the quartz, but is also largely associated with copper and iron pyrites, blende, galena, stibnite, &c. , the quan- tity of sulphides varying from j to 10 per cent, of th...e ore, and averaging from 2 to 3 per cent. Silver occurs as argentite, fcc. , while tellurides of both gold and silver are sometimes found. The average amounts extracted from the ordinary ore are gold, 5 to 10 dwts. Per ton, silver, 2 to 5 dwts. ; but a considerable percentage of the gold recovered comes from "specimen" ore, which is often worth some thousands of pounds per ton.
No rock-breakers are used, grizzlies or sizing screens being also unknown, and the feeding is done by hand. The small stuff is shovelled into the mortar, and big pieces of rocks are rolled into the feed opening, and rammed in by a few blows of the sledge hammer, if they stick there.
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To quickly assess the difficulty of the text, read a short excerpt:
Z. * The ore in this district may be regarded as on the border line between "refractory" and "free-milling" ores. It varies greatly in hardness and composition, and consists of "stringers" of quartz running through a more or less decomposed and brecci- ated hornblende-andesite. The gold is often in visible specks and threads in the quartz, but is also largely associated with copper and iron pyrites, blende, galena, stibnite, &c. , the quan- tity of sulphides varying from j to 10 per cent, of th...e ore, and averaging from 2 to 3 per cent. Silver occurs as argentite, fcc. , while tellurides of both gold and silver are sometimes found. The average amounts extracted from the ordinary ore are gold, 5 to 10 dwts. Per ton, silver, 2 to 5 dwts. ; but a considerable percentage of the gold recovered comes from "specimen" ore, which is often worth some thousands of pounds per ton.
No rock-breakers are used, grizzlies or sizing screens being also unknown, and the feeding is done by hand. The small stuff is shovelled into the mortar, and big pieces of rocks are rolled into the feed opening, and rammed in by a few blows of the sledge hammer, if they stick there.
What to read after The Metallurgy of Gold?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Kirke Rose to read onlineMoreLess
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