Back to work!

The last two weeks before my visa ran out I spent drilling in Paonia, Colorado, where Joey had spent two weeks working during my holiday.
The purpose of drilling is to pump methane gas out of multiple coal seams at 500-600m depth to reduce compulsory mine shutdowns (air-methane mixtures are explosive at 5 percent methane) at the time of mining it.
By using angle holes, multiple coal seam locations can be reached from one drill site, kind of handy in an (offical!) wilderness area where every road needs to be cut with a dozer.
Method of drilling was directional (mud motor with tricone bit) and DTH (down the hole hammer) for the straight parts.