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Rock Excavation: Methods and Cost (Classic Reprint)
Hardcover
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Excerpt from Rock Excavation: Methods and Cost
The value of the mineral products of America annually exceeds For explosives alone the sum of is expended each year, and it is well within limits to say that fully twice as great a sum is paid out to drillers and blasters. When we consider the labor, the power and the powder required to mine and to quarry products in the aggregate so enormously valuable, we can not fail to be impressed with the scantiness of literature on the economics of rock e...
The value of the mineral products of America annually exceeds For explosives alone the sum of is expended each year, and it is well within limits to say that fully twice as great a sum is paid out to drillers and blasters. When we consider the labor, the power and the powder required to mine and to quarry products in the aggregate so enormously valuable, we can not fail to be impressed with the scantiness of literature on the economics of rock e...