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Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 923
use of the existence of these vast stores, suppose that the mining ofthem must of course be advantageous; on the contrary, the sad experience of the world has almostalways shown exactly the reverse. The principal cause of this result is the enormous cost of blasting and removing the hard,… … ■ ■■■ (ram toifi I &®KI WK1 MQJRd IB<S> EL [©IT GOLD. 911 incurred in machinery, labor, and materials for reducing it to powder, and separating the gold with theaid of mercury. When the mine is pursued to a considerable distance below the surface, there is aheavy additional expense…Mechanical engineering
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