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approximate sites of drill holes SL4,13,14,21, and 2a and <br />3 others in the flat lying portions of the 40 acre parcel <br />to the west). <br />2.) The orientation, location, and elevation of the! old <br />ranch house will be determined. <br />3.) The monuments and the ranch house orientation Will be <br />tied in by both horizontal and vertical control to the mine <br />coordinate grid system and also to a minimum of 3 additional <br />permanent monuments to be set outside of the possible <br />subsidence perimeter. <br />4.) If snow cover permits (Normally snow cover in this area <br />is in excess of 3 ft deep from November through April which <br />represents 6 months of the year.) levels will be run between <br />all monuments and the ranch house control on a quarterly <br />basis. At this time, if motion is detected on any of the <br />monuments by change in elevation, a transit survey tying the <br />offending monuments into the perimeter monuments will be run <br />to determine movement in both the horizontal and vertical <br />planes. <br />5.) Results will be submitted to the Division semiannually. <br />The measures described <br />high competency of the <br />aforementioned histori <br />precludes any material <br />forseeable use of land <br />previously concerning the extCemely <br />overlying strata coupled with the <br />cal lack of subsidence effectively <br />damage or diminuation of value or <br />associated with our mining operations. <br />Specific measures to be taken to further mitigate the unlikely <br />occurance of subsidence are contained in the Emling tteport <br />following. <br />• <br />~ ~/~8/81 <br />190 <br />