>> anthony: larry hoffman is a longtime mining engineer and instructor. matt krattiger is the new guy. a hard rock miner by day, he likes to relax by spending his free time down here; playing. >> matt: i come mining for fun on my days off. >> anthony: okay! >> matt: it's one of those things that just gets in your blood. you got a lot of pride in it. >> anthony: these guys like it under ground and even more they seem to like drilling holes deep into the rock face. ♪ [ drilling ] >> matt: you want to drill? >> anthony: sure. [ drilling ] ♪ >> matt: pull that out. then get the feel for where the weight sets on it. >> anthony: oh yeah! cool. >> matt: do that several hundred times a day. >> anthony: no! [ laughs ] >> matt: just do it. >> anthony: sweet!