Well, I think you're making a ridiculous logical leap.  Wanting to get rid of the EPA does not equate to wanting to get rid of all mining regulations!  Come on.

Perhaps you should consider this possibility.  Some people may want to get rid of the EPA, because they think (not without reason) that it is a politicized agency used as a weapon to the advance green and anti-business agendas of the Left - it is no longer an agency that oversees reasonable environmental protection.  Many conservatives are fully in favor of mining (and other) regulations, but they also want to dissolve the EPA - in favor of a more responsible and even-handed federal agency.

I might also suggest that the opinions of a few commenters is not representative of the Right.