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Collection: Books and Periodicals
Practical Stamp Milling and Amalgamation by H.W. MacFarren (1910) (166 pages)
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Page: of 166
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144 STAMP MILLING AND AMALGAMATION
crushed fine, while a large amount of water is used in the
mortar to increase the tonnage.
Economie problems must be studied when considering
amalgamation and cyanidation. With a small mill of 10
or 20 stamps obtaining a good extraction by amalgamation and concentration, it may not be advisable to put in
a cyanide plant taking the pulp directly, on account of .
the high cost per ton of capacity for installing and operating a small plant of this type. It may be better to
run the tailing into a pond and later put in, at less tonnage expense, a leaching plant of large capacity. With a
pulp crushed through a 30 or 40-mesh screen and properly
impounded, it is possible to extract practically all of the
dissolvable value. In a country of average working costs,
an impounded tailing having a value of 80 cents per ton
and giving an extraction of 80% will return a good margin of profit. As the plate or concentrator tailing becomes higher, the necessity for a plant to treat it directly
increases, since the tailing pond will hold a large amount
of money that is not available, and there is a loss from
the sand blown away and an occasional breaking of the
dam. A tailing pond is sometimes a desirable thing to a
manager, or promoter, as when it figures prominently, too
prominently usually, in the report of the assets and possibilities of the company’s property. Regrinding of the
pulp followed by amalgamation (secondary amalgamation) may reduce the value of the tailing to a point so
low that it may not be profitable to cyanide it. For this
purpose some form of grinding pan, a Chilean mill, or the
slow-speed roller mill, that will admit of amalgamation
within the mill, may be recommended. The tube-mill has
been found the most satisfactory machine for fine grind-