2025-06-30_PERMIT FILE - C1981019A (2)

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RULE 4 PERFORMANCE STANDARDS Collom – Rule 4, Page 20 Revision Date: 4/28/22 Revision No.: TR-154 To date, reclamation efforts at the existing operation have proven successful. Herds of deer and elk are regularly seen grazing on the reclaimed areas. Rodent and small game populations have reestablished on the reclaimed areas providing a readily available food source for local raptor populations and other predators. Columbian sharp-tailed grouse also use reclaimed grasslands. Public Land Survey Protection Colowyo will protect all survey monuments, witness corners, reference monuments, and bearing trees against destruction, obliteration, or damage during mining operations. Any monuments, corners or accessories that are removed by the mining process, Colowyo will hire an appropriate county surveyor or registered land surveyor to reestablish or restore the monuments, corners, or accessories at the same locations, using the surveying procedures in accordance with the “Manual of Surveying Instructions for the Survey of the Public Lands of the United States.” The survey will be recorded in the appropriate county records, with a copy sent to the Authorized Officer. 4.19 PROTECTION OF UNDERGROUND MINING Colowyo will conduct no coal mining closer than 500 feet to any point of either an active or abandoned underground mine. Underground coal mines have been operated in the past as discussed in Section 2.04.4, but their locations were on the-northern side of Streeter Draw well over 500 feet from present Colowyo mining. The surface mining activities of Colowyo have been designed so as not to endanger any present or future operations of either surface or underground mining operations. As discussed in Section 2.05.3, Colowyo has engineered its mining plan to maximize recovery of coal by current economical surface mining methods. 4.20 SUBSIDENCE CONTROL Colowyo is conducting a surface coal mining operation. Therefore, the requirements of 4.20 are not applicable to the Colowyo operation. 4.21 COAL EXPLORATION All coal exploration activities within the Collom permit revision area will be completed in accordance with the requirements and procedures outlined in the Volume 1. 4.22 CONCURRENT SURFACE AND UNDERGROUND MINING Colowyo does not plan to have concurrent surface or underground mining activities; therefore, the requirements of this Section are not applicable to this permit application. 4.23 AUGER AND HIGHWALL MINING 4.23.1 Scope Highwall mining allows for the recovery of additional coal resources beyond the final pit highwalls and endwalls. Colowyo’s has previously effectively highwall mined in the East, Section 16, West, and South Taylor Pits in the past. Colowyo will utizilied the vast experience gained from previous highwall mining and implement a highwall mining plan in the Collom Pit. Please see Section 2.06.9 and Map 23B for the seams and areas planned to be highwall mined.