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Colowyo Coal Company <br />2017 Annual Reclamation and Hydrology Report <br />SECTION 7 - DRILL HOLE LOCATIONS <br />RULE REOUIREMENT <br />None Apply <br />GENERAL DISCUSSION <br />All drill holes drilled inside the pit during the report year will be reported in the annual <br />reclamation report. All drill holes will be surveyed for x, y, z coordinates after being <br />drilled. Unless a drill hole was permitted to be backfilled and plugged, drill holes will be <br />left open to depth since they will be mined through during the course of normal pit <br />mining activities. A rock is placed on the top of all open drill holes to prevent <br />tripping/falling hazard for persons or animals until mining occurs through the open hole. <br />In 2017, Colowyo drilling 20 drill holes within the Collom Pit to further define the <br />geologic model for the box cut of the pit. All holes that were not or will not be mined <br />through were plugged and abandoned. Please see Exhibit 7 for all drill hole locations. <br />Page 51 <br />