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At the same time the first mechanical rock drills were boring holes that miners
had always bored by muscle. A surface engine sent compressed air down pipes
to the heavy rock drill and pistons in the cylinders of the drill thrust to and fro, ...
The dust drifting from the rock drills underground carried a new hazard, more
dangerous than physical accidents because it was invisible. The machine miners'
main job was to drill holes into the rock and fill the holes with explosives, and the
dust than the old hand drills that were hammered into the rock with the slow
blows of a miner's hammer. One American rock drill was aptly named 'the widow
maker'. The increasing depth of mines made ventilation difficult, and often no
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LibraryThing ReviewUser Review - nandadevi - LibraryThing
The history of mining is central to Australian history, from the gold rushes of the 1860's which brought hundreds of thousand of immigrants, to the mountain ranges of iron ore and immense natural gas ... Read full review