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A man stands in the mining shaft holding an instrument to test the gas levels in the mine.

1. Testing for Gas in a Pittsburgh Seam Coal Mine

Pile of coal in a storage bin.

2. Coal Storage Bin

Jackhorn five inch lock coal with an automobile in the background.

3. Jackhorn Five Inch Block Coal

Jackhorn Furnace coal with a tennis ball placed among the blocks.

4. Jackhorn Mine Furnace Coal, Tennis Ball Size

Pile of Jackhorn five inch block coal.

5. Jackhorn Five Inch Block Coal