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West Etk Mine <br />45 feet from the start of the panel. MCC has experienced no measurable seismic events at the <br />surface due to initial longwall caving and bumps originating from the mine. Because the roof <br />conditions are similar in the Apache Rocks and Box Canyon mining azeas, MCC does not <br />anticipate any different seismic effects in these areas than has been experienced in the current <br />mining azea. <br />Detailed Description of Damage or Diminution of Reasonable Use Which Could ResuU <br />from Subsidence Related Phenomena 2.05.6(6)(e)(ii)(A-C) <br />Based upon the anticipated subsidence phenomena previously described in this section, and the <br />lack of structures and renewable resource lands, MCC and WWE concludes that there will be <br />little, if any, damage or destruction of reasonable use within the current permit area. <br />The "worst possible consequence" to the newer, wood-framed buildings and livestock <br />enclosure would be complete destruction. The building that is apparently utilized as a "hunting <br />cabin" was constructed after the SNW longwall panel was developed and longwall mining in <br />this panel had begun. The smaller "bunkhouse" building and livestock enclosure were <br />constructed after longwall mining was complete in both the SNW and 6NW longwall panels. <br />They are located approximately over the eastern-most pillar of the SNW longwall panel <br />headgate, near cross-cut #17 and approximately 90 feet southeast of monitoring well SOM C- <br />72H. The landowner had been provided updated mine plans in December 1993, and thus, was <br />aware that mining would occur under the site. <br />.. ~ The influence of subsidence, based on a conservative twenty-five degree (25°) angle-of-draw <br />and an overburden depth of approximately 800 feet, the vicinity of the building in late <br />November 1994, and was two cross-cuts past it by late December 1994. The building and site <br />were measured, surveyed and photographed in early November 1994, prior to possible <br />subsidence impacts. Subsequent surveys and photographic records were begun in early <br />December 1994, and were continued approximately weekly until January 1995, then bi- <br />monthly through Mazch 1995, when mining of the panel was completed. Regular monitoring <br />(weekly, then bi-monthly, as above) were conducted when the 6NW longwall panel was mined <br />past this area. Maximum subsidence, as presented in Exhibit 60, is not expected ai this <br />location, but maximum stresses are amicipated, as the building is located at the edge of the <br />panel. Because MCC will compensate for, repair or replace the building in compliance with <br />CMLRB Rule 4.20.3(2), no material subsidence damage will result, as defined by CMLRB <br />Rule 2.05.6(6)(e)(ii)(A). <br />The "worst possible consequences" from mining to hydrologic resources, hydrology monitoring <br />stations, and the many trails and unimproved U.S. Forest Service roads could be complete loss of <br />surface water resources to the mine workings, total destruction of the stations and total destruction <br />or blockage of the trails on roads. MCC will repair or replace these items as discussed later in <br />this section. <br />2.05-133 RevisedJw. /995 PR06: //96 RN03; RevisedJan. /998 PROS; RevisedMtry /999 TR89 <br />