About: How Coal Is Mined and Refined - Top Coal Mining Spots in the World - Documentaries
Sir, I found one stone round in shape and black in colour and just like salt use to come out from this stone. If u hve any idea about this stone then please let me know.
What amazes me is how someone figured out coal could be used for steel to make guns,,, that would to me be like me thinking and using bark of a tree to make aluminum. How would I think of it?
it's really so hard to do this job .heads off to all coal miners .....
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