Topics included the different types of coal and mines around the nation ... has been affected as the U.S. considers the impact of coal mining on the environment and the health of the population ...

Over time, the plant matter turns into a carbon-dense black or brownish-black sedimentary rock – coal. There are four major types or “ranks ... Meanwhile, the coal mining industry employs ...

Anthracite mined in Northeast Pennsylvania has the highest grade of carbon in the world and is a different product ... they call for “No More Coal,” a local mining engineer said.