Drill-hole Collar Location Sample Clauses

Drill-hole Collar Location. Due to degradation by mining activity, reclamation, and other ground disturbance, physical location of pre-Atna drill-hole collars is impractical, if not impossible, for most ground surrounding the pit areas. However, Pxxxxx Mining Company routinely surveyed drill-hole collar locations. This was done by the mine surveyor using a total station (R. Xxxxxx, personal communication, 2004). Records for each hole were meticulously kept in a log book listing hole number, coordinate values, and elevations. This book is kept in the file system onsite. All coordinate values were obtained in local mine grid values. The mine grid origin of 10,000N, 10,000E was established on the common corner of sections 28, 29, 32, and 33 of T48N, R24E, MDBM, now mined out. An Array of control points has been established throughout the property for survey control and has been well documented. Many of these points are still well marked and can be used for future surveys. Homestake Mining Company drill holes were also surveyed in. These were done with GPS units and a local base station. GPS used was a Trimble LS5000 survey grade RTK system. Prior to surveying the holes a transformation from latitude-longitude values to local mine grid was established in the GPS data collector using pre-existing survey points. Mine grid coordinates were able to be read directly from the GPS unit and stored in files. (R. Xxxxxx, personal communication, 2004) Prior to Atna’s drilling campaign, a survey was completed to see if non-survey-grade GPS would temporarily locate collar coordinates for plotting purposes. The GPS used was a Trimble AG132 with autonomous precision of 5 meters. Local grid coordinates were obtained through ArcPad by using a datum definition defined for the Pxxxxx Grid system. Settings were established in the AG 132 to read differential GPS fixes from the Coast Guard beacon system if they were available. This correction, although not nearly optimum, brought relative accuracy of the surveys to within 15 feet, acceptable for initial plotting. After system setup, the unit was taken to the field and used to resurvey control points and several (15) drill holes (water monitor wxxxx and other). Results from this survey show the GPS unit to be accurate to within 8 feet in the X direction and 6 feet in the Y direction from any survey point or known drill hole. For underground mining, the GPS coordinate accuracy is insufficient. Due to this fact, a professional surveyor using a total station obta...
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