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Colowyo Coal Compaay <br />2007Annual Reclamation aad Hydrology Report <br />SECTION 12 -DRILL HOLE LOCATIONS <br />RULE REQUIREMENT <br />None Apply <br />GENERAL DISCUSSION <br />All drill holes drilled inside the pit will be reported in the annual reclamation report <br />starting in 2007 and moving forward. All drill holes will start at the surface and <br />penetrate no deeper than the bottom of the planned pit floor. Typically, two separate <br />drill holes will be drilled on each drill site, the first being a pilot hole and the second <br />being the core hole. All drill holes will be surveyed for x, y, z coordinates after being <br />drilled. All drill holes will not be backfilled with bentonite plug geUchips and will be <br />left open to depth since they will soon be mined through during the course of normal <br />pit mining activities. If for some unforeseen reason the pit does not mine through any <br />given drill hole, that drill hole will be relocated and sealed in accordance with the <br />rules. In-pit drill holes will not be bonded as they will be mined through during the <br />normal mining sequence. A rock will be placed on the top of all open drill holes to <br />• prevent tripping/falling hazard for persons or animals. For locations of all in-pit drill <br />holes please see Exhibit 12A. <br /> <br />Page 12-1 <br />