Doncaster Oral History Project - Miners Safety Lamp
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Coal is the official state mineral of Kentucky.
About: Doncaster Oral History Project - Miners Safety Lamp
You tested for gas either high or low, in the roof or further down, usually for firedamp. Gas caps, ie blue caps on the flame would form and from that a percentage would be calculated. Do you turn the fan up, or get the men out of the pit? Such was a deputy's responsibility.
Coal is extracted from the ground by coal mining, either underground by shaft mining, or at ground level by open pit mining extraction.
Coal is primarily used as a solid fuel to produce electricity and heat through combustion. World coal consumption was about 7.25 billion tonnes in 2010
The price of coal increased from around $30.00 per short ton in 2000 to around $150.00 per short ton as of September 2008.
In early 2015, it was trading near $56/ton.