* Coal is a mineral. This is correct. Coal is formed over millions of years from the compressed remains of plants. While it's not a traditional mineral like quartz or gold, it's considered a mineral resource.
* It extracted from the bowels of earth. This is also correct. Coal is found deep underground in layers called coal seams.
So, your statement is generally correct. It could be improved by saying:
* Coal is a mineral resource that is extracted from the earth's layers called coal seams.
This wording emphasizes the importance of coal as a resource and clarifies where it's found.
