Principles of Metal Mining (Classic Reprint) - Tapa dura

Sinopsis

Excerpt from Principles of Metal Mining

The use of gunpowder for blasting in hard ground, said to have been first used in the parish of Breage in Com wall, is scarcely three centuries old; and even yet the ancient mode of rendering the rock brittle, by first heat ing it by means of a fire of brushwood kindled in the end, and then throwing cold water upon it, is still in use in some of the continental mines.

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