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Children working in coal mines
What is a shackled in coal mines
There are a total of fifty-two coal mines in the United States. The state with the most collieries is Wyoming which has thirteen coal mines and they are surface mines.
The total number of coal mines in operation in 2002 totaled 1,426, compared to 2,746 a decade prior.
In 2001 there were 759 surface coal mines in the United States, which produced 745.3 million short tons of coal.