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-37 - <br />XXII. Bonding - Rule 2.05.4(2)(b) <br />Storm King Mines, Inc, has agreed to post a performance bond in the amount of <br />$225,000.00. The Division has determined that this amount will be sufficient <br />to cover the cost of reclamation at the Coal Ridge No. 1 Mine. <br />Pursuant to Rules 2.07.2(2)(j) and 3.02.1(1), the performance bond will be <br />filed with the Division, payable to the State of Colorado before a permit will <br />be issued. <br />XXIII. Sealing of Drill Holes and Underground openings - Rules 2.05.4(2)(9) <br />and 4.07 <br />Closure plans for drill holes, mine portals, and shafts are delineated on <br />pages 4-69a of Volume I of the application. The sealing plans meet all the <br />requirements of Rules 2.05.4(2)(9) and 4.07. <br />The proposed operation is in compliance with the requirements of this section. <br />XXIV. Subsidence - Rules 2.05.6(6) and 4.20 <br />Information on subsidence reviewed by the Division is in Section 4 of Volume I <br />of the application, and Appendix 4.5-1 of Volume VI of the application. <br />Appendix 4.5-1 discusses the mechanisms controlling the character of roof <br />strata failure and anticipated gob movements in relation to bedrock dip. The <br />applicant observes that a slight possibility exists for sinkhole collapse to <br />occur near the outcrop crown pillar. The application proposes a specific <br />visual monitoring program to concentrate in areas over and adjacent to the <br />crown pillar, in order to specifically detect potential sinkhole collapse <br />(page 41.1). The application also presents a proposed mitigative program for <br />sinkhole collapse, were it to occur. On page 43.3 of Appendix 4.5-1 the <br />applicant proposes that access be restricted to any areas of sinkhole collapse <br />and that appropriate amendments be made to the mine plan. The Division <br />believes it prudent, in order to assure protection of the Public health and <br />safety to impose the following stipulation upon permit approval. <br />Stipulation No. 8 <br />THE DIVISION REQUIRES THE PERMITTEE IN THE EVENT THAT SINKHOLE <br />SUBSIDENCE COLLAPSE WERE DETERMINED, BY THE DIVISION, TO CONSTITUTE A <br />POTENTIAL HAZARD TO THE PUBLIC HEALTH AND SAFETY, TO IMPLEMENT <br />APPROPRIATE SEALING AND BACKFILLING OF SINKHOLE COLLAPSE FEATURES. <br />The application observes that moderate slumping and landsliding is limited to <br />areas "outside and below the anticipated areas of surface subsidence effects" <br />(page 39.5); the Division concurs with that opinion. There appears, however, <br />to be extensive geomorphic evidence that ancient slope movements have occurred <br />throughout large portions of the slopes on the northeast face of Coal Ridge. <br />