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coal is a valuble rock mined in Indiana
coal.
There is very little coal left in England as most of it has already been extracted.
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oil coal gas
Early Texas settlers undoubtedly mined both coal and lignite from numerous ... Most mines were small, yielding between 10,000 and 50,000 tons per year.
Lignite
Lignite
Although most of England's mineral reserves have now been mined out, in the past coal, oil, clay, stone, tin, copper, lead and iron were mined.
Most of the nation's coal comes from Wyoming, which is the largest coal-producing state in the United States. Coal is also mined in states like West Virginia, Pennsylvania, and Illinois.
I think it might be coal I don't know for sure
Wyoming, the country's dominant surface mining state, has 17 surface mines that produced 368.7 million short tons of coal in 2001. This represented 49 percent of all surface-mined coal and 33 percent of all coal mined in the United States