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yields of 2.00 tons and 5.00 Animal Unit Months (AUM's) and 1.75 tons per acre and 4.38 <br />AVM's per acre, respectively. The Waste land code corresponds to the lowest production level <br />available and is equal to 80 acres per AU. <br />Previously Mined Lands <br />Significant portions of the proposed New Horizon North Mine Permit Area have been disturbed <br />by previous coal mining activities. For example, the extent of the old NH1 mine area, <br />corresponding to the southern most 65.55 acres and most 4.42 acres within the proposed <br />equipment corridor shown on Map 2.04.3 -1 - Land Use Map, have been disturbed by prior <br />mining activities. WFC has no old PCC or Edna Coal Company maps in their files documenting <br />when the previous mining activities on these lands were conducted. The Edna Coal Company <br />opened the Navajo Mine in 1958 on lands located on the north side of Tuttle Draw, to the south <br />of County Road AA and to the west of County Road 27.00. It is not known where the original <br />workings of the Navajo Mine were located, however, examination of an NRCS 1973 aerial <br />photograph shows that the mine workings in this area commenced near the crop line of the north <br />fork of Tuttle Draw and extended in a southwest to northeast direction and moved from the east <br />toward the west. This photograph shows that all of the lands associated with the proposed <br />equipment corridor to the south and east of Sediment Pond 1 that are associated with the <br />proposed mine equipment corridor had been disturbed by mining prior to 1973. <br />Lands with the boundaries of the NH1 Mine, which now corresponds to the previously mined <br />portion of the New Horizon North Mine Permit Area to the north of County Road AA, show no <br />mining disturbance in this 1973 aerial photograph. However, examination of the NH1 Mine <br />Permit maps reveals that based upon the "Premining Vegetation Types" map of the NH1 mine, <br />and the Archeological Map based upon aerial mapping taken on 21 February 1980, there was one <br />excavated mine pit located in the extreme southeast corner of the site and additional surface <br />disturbance up to and including the realigned County Road AA which extended west of the <br />existing County Z50 Road. According to another aerial photograph in the PCC Nucla Mine <br />Permit based flown on 19 April 1986, the entire NH1 Mine area had been disturbed by mining <br />with the active highwall being located just to the north of the middle of the existing reclamation <br />tract. Another aerial photograph taken in 1989, shows that the western mine pit of the NH1 <br />Mine was largely backfilled and that mining on the eastern pit was nearing the extent of where <br />the current highwall subsidence highwall crack in the area where the NH1 reclamation is located. <br />Examination of a 1993 aerial photograph taken by WFC, shows that the entire NH1 Mine had <br />been completely backfilled to AOC, topsoiled and that there was just a small amount of grading <br />work near the existing drainage channel near the center of NH1 Mine area. Discussions with Mr. <br />Ross Gubka, the New Horizon Mine Chief Engineer, who started working at the New Horizon <br />Mine in 1992, confirms that WFC had to do a small amount of regrading shortly after he arrived <br />to establish positive flow across all of the old PCC reclamation at the NH1 Mine. All <br />reclamation efforts at this site appear to have been completed in 1993. <br />Examination of these aerial photographs clearly establishes that all of the mining disturbance <br />Section 2.04.3 Page 12 November 2011 <br />