Sharp drops in barometric pressure can cause potentially explosive methane gas to migrate into work areas, according to the Mine Safety and Health Administration. The explosion occurred during a thunder storm.—"Blast Traps 13 in a Coal Mine in West Virginia," NY Times, Jan 3, 2006
How grateful am I not to be a coal miner?
The pure energy value of coal is as much as 29 MJ/kg. In 2004, the US produced 178 million MWh of electricity from coal and consumed 93 million tons of it, yielding energy at a rate of 7.55 MJ / kg (this discounts the energy costs of mining and transporting it, at least). The average retail price of that electricty was US$0.10 / kWh (ibid.). By my calculations, that's $2.10 / kg.
Now, we would hardly expect a coal miner to be worth his weight in gold, but your calculation above enables us to ask, is he worth his weight in coal? Assuming a mean miner weight of 90 kg, we get a price for miners' lives of $4.90 / kg. So we find that miners are worth more than double their weight in coal - a fact which will probably not much temper your gratitude at not being one.
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