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Southfield Mine <br />Minor Revision Request No. 76 <br />South Fan Installation <br />CULTURAL AND HISTORIC RESOURCES (2.04.4) <br />The Monarch No. 4 Mine is identified as a possible historical site evaluated by <br />the Colorado Historical Society in Exhibit 6, Cultural and Historic Resource <br />Information, of the EFCI permit document. This documentation indicates that <br />the evaluation resulted in a determination that the site is not eligible for listing. <br />Also refer to Section 2.04.3 of the EFCI permit application document (Volume <br />1). <br />GEOLOGY (2.04.6) <br />Geology of the area to be effected by the proposed fan installation is <br />consistent with surrounding areas within the EFCI permit area. Surficial <br />materials consist of geologically recent interbedded outwash deposits of soil, <br />sand, silt and conglomerates. The site is located near the base of a small <br />intermittent drainage which has cut through the outwash materials exposing <br />the Vermejo formation on the valley sides. The existing mine portals are in the <br />Red Arrow coal seam. The Red Arrow seam is part of the Vermejo formation <br />which consists predominantly of sandstones and fine-grained siltstones. <br />The dominant structural features in this area are the Wet Mountain Fault and <br />adjacent Chandler Syncline. The synclinal axis is located approximately 3,000 <br />feet southwest of the proposed site and the fault is an additional 4,500 feet to <br />the southwest. This is no history or evidence of any geologically recent <br />movement along the fault. <br />While some surficial sloughing of exposed material from the existing portal <br />bench has occurred, there is no evidence of any significant rock mass failure. <br />In addition, the portal bench is cut into the existing valley side which slopes at <br />c: xoM P ramal .BBO <br />It/~]/B1 fpm 4 <br />