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RULE 2 PERMITS <br />2.06 PERMIT REQUIREMENTS - SPECIAL MINING CATEGORIES <br />2.06.1-3 Scope, Experimental Mining, and Mountain Top Removal <br />There will be no experimental mining practices at the Collom Pit. <br />2.06.4 Steep Slope Mining <br />Colowyo may request a variance for mining and reclamation for steep slope mining as specified in Rules <br />2.06.4(2) and 4.27. <br />2.06.5 Variance from Approximate Original Contour Restoration Requirements <br />The Collom mining area will include non -mountaintop removal steep slope surface coal mining and <br />reclamation operations. Colowyo is not currently requesting a variance from approximate original <br />contour in the post -mining topography (PMT), but maintains the option to pursue this in the future as an <br />amendment to the permit application. The PMT as presented reflects the pre -mining topography <br />generally, with drainages and drainage divides remaining in their approximate current locations. Some <br />minor moderation in topography is expected due to limitations associated with reclamation equipment. <br />Post -mining topography is shown on Map 19C. Table 2.05.6-5 presents the mine -wide volumetric <br />calculation in support of the PMT. The PMT is designed based on the CDRMS rules for Operations on <br />Steep Slopes as discussed in Section 4.27 of this document. <br />2.06.6 Prime Farmlands <br />Prime farmlands do not exist within the Collom permit revision boundary (see Section 2.04.12). <br />2.06.7 Reclamation Variance <br />There will be no delay in contemporaneous reclamation due to underground mining activities; therefore, <br />this section is not applicable. <br />2.06.8 Alluvial Valley Floor (AVF) <br />General <br />The geologic and hydrologic conditions of the Collom Mine Expansion area have been studied since at <br />least 1980 by Colowyo and other potential interests. These studies have included the examination of the <br />valley bottoms for the possible presence of alluvial valley floors. These studies include the 1985 Office <br />of Surface Mining Reclamation and Enforcement (OSMRE) Alluvial Valley Floor (AVF) Reconnaissance <br />report and map of northwest Colorado. The reconnaissance by OSMRE was compiled on 1:100,000 -scale <br />maps and was meant to represent a reconnaissance level effort to identify areas which are likely to meet <br />the AVF definition (from Introduction to OSMRE report). Thus, any area identified on the OSMRE maps <br />is only potential AVFs. It was recognized in the OSMRE study that future studies may more conclusively <br />prove or disprove the AVF findings in the report. <br />In examining the land of the Collom Mine Expansion area and the surrounding area, the landforms are <br />controlled by two distinct geologic features. One is the Collom syncline/Danforth Hills and the other is <br />the Axial Basin (these have been described previously in section 2.04.6 - Geology Description). The area <br />of the Collom Syncline has sloping topography to the north until the Collom Syncline axis is reached and <br />Collom — Rule 2, Page 127 Revision Date: 1/6/17 <br />Revision No.: TR -109 <br />