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Ch. 6: Mining, Milling, ... of Sulphurets

Ch. 6: Mining, Milling, ... of Sulphurets Page of 172 Ch. 6: Mining, Milling, ... of Sulphurets Text size:minus plus Restore normal size   Mail page  Print this page
140                               GOLD MINING IN SOUTH CAEOLINA.
barrels (see fig. 30) by cars holding 1 ton each. The barrel is 60 inches long by 42 inches in diameter, made of east-iron and lead-lined (12 pounds of lead to the square foot). It also contains a lead valve in order to ascertain whether the necessary amount of free chlorine is present. (The use of this valve is unnecessary after the character of the ores becomes known).
The full charge consists of 120 gallons of water (to make an easily flowing pulp), from 8 to 11 pounds of bleaching powder, then the ore, and finally 12 to 15 pounds of sulphuric acid. The ban-el is hermetically closed and revolves for about 3 hours at the rate of 15 to 18 revolutions per minute. (A 5 horse-power engine performs this work and also the elevating of the ore.) The barrel is then inverted, opened and discharged through a lead-lined semicircle in the floor to a filter on the
Ch. 6: Mining, Milling, ... of Sulphurets Page of 172 Ch. 6: Mining, Milling, ... of Sulphurets
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