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Both have advantages and disadvantages. Both are potentially environmentally catastrophic but can be done safely with a lot of cost or at least the effects mitigated during mining, or after the mine is played out (e.g. no more ore to mine cheaply). This extra cost is the reason that mining is usually, but not always, environmentally …

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The water was used for a variety of purposes, including removing overburden and rock debris, called hydraulic mining, as well as washing comminuted, or crushed, ores and driving simple machinery. The Romans used hydraulic mining methods on a large scale to prospect for the veins of ore, especially a now-obsolete form of mining known as hushing.

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· Although safety is often a priority at many coal mines, one of the biggest disadvantages of being a coal miner is that it is still a dangerous job.

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