Absolutely correct. Coal is such a tiny, tiny portion of the "we need to figure out how much stuff is in this pile" market. Companies need that information bot

Absolutely correct. Coal is such a tiny, tiny portion of the "we need to figure out how much stuff is in this pile" market. Companies need that information both to keep their books in order (what's the dollar value of our inventory of gravel?) or to know whether they have adequate or excess supply of materials for their operations (do we need to slow down our procurement of sand?). There are several companies in the market that use either drone footage or in some cases just a phone camera to estimate volumes of piles of stuff.