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A Coal rock is a rock that contains coal. Players with a Mining level of 30 can mine coal rocks with a pickaxe, granting 50 Mining experience. Coal rocks can be found in numerous mines throughout RuneScape, most abundantly in the Mining Guild.
Robert Johnson for Business Insider. There's no denying the importance of coal in America. The combustible black rock provides about 40% of the United States' electricity and plays a vital role in the economy of places like West Virginia. But there's also no getting around the major health and environmental problems caused by both coal mining and coal burning.