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-3a- Pursuant to Rules 2,(17.6(2)(]) and 3,02.1(1), the performance hood in the amount of $550,249.00 .for phase II of the mining and reclamation plan must be filed with the Division, payable to the State of Colorado, before a per- mit will be issued. Also, bond must be submitted 30 days prior to the initiation of each phase or increment of the proposed plan. Therefore, the following stipu7.ations are necessary l6. A PERFORMANCE BOND IN THF. AMOCINT OF $550,249.00, PAYABLE TO THE STATE OF COLORADO, MUST BE FILED SJITH THE DIVISION IJITHIN 30 DAYS FOLLOWING FINAL APPROVAL OF THIS PROPOSED DECISION TO APPROVE THE PERMIT. 17. EACH SCHEDULED INCREMENTAL BOND AMOUNT PTUST RE FILED WITH THE DIVISION AT LEAST THIRTY (30) DAYS PRIOR TO THF. COMPIENCEMENT OF SURFACE COAL. MINING AND RECLAMATION OPERATIONS IN 'f11E INCREMENTAL AREA CORRESPONllING TO THAT BOND AMOUNT. CONFIRMATION 1'H AT RECLAMATION SCHEDULED IN THE PRF,VIOUS PHASE OR INCREMENT' MUST ACCOh1PANY THE BONU Ah10L~NT SI)BMI'fTED TO THE DIVISION. f s - Rules 2.05:4(2 Information satisfying these requirements appears on pages 2.04-15b and 2.06-5. 1'he applicant has committed to conform with all the applicable regulations regarding the sealing and managing of drill holes. XXI. Special Categories of Mining - Rules 2.06, 4.23, 4.27 Auger Mining G.E.C. proposes to conduct angering operations at the exposed highwalls created during the process of their contour stripping mine plan. The company proposes to penetrate approximately 150 feet beyond the exposed coal seam highwall. The configuration of the area to be mined is such that, as the operator observes: "Access to these small amounts of remaining reserves would be difficult and impractical by any other method of mining." The applicant includes discussion of. appropriate techniques to avoid hazards due to high wall spa.lling, entry into potentially hazardous existing under- ground workings and appropriate machinery and construction hazards. In order to avoid the potential of highwall collapse, the applicant proposes to utilize a minimum 8" riff thickness between auger holes. Normal guidelines, as presented in U. S. Bureau of Mines Open File Report 108-76, entitled "Technology of Auger Mining" (October, 1975), suggest that a rib thickness equivalent to one-sixth of the mined seam thickness should be retained heCween auger holes. Stra- tigraphic data presented by C.E.C. within the permit application indicates that seam No. 2 reaches a reported maximum thickness of 5 feet. In areas where seam thickness exceeds 48", the proposed 8" rib may not be adequate. In areas of seam thickness greater than 48", the applicant should maintain a rib thickness equivalent to one-sixth that of the actual seam thickness.