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Introduction <br />Three subsidence areas located on the Cribbs -Jackson property that may have resulted from the <br />operation of Energy Fuels Coal, Inc., Southfield Mine (permit number C-81-014) in Fremont, <br />County, Colorado, were partially filled in June 2015 by Mergen Ecological Delineations, Inc. of <br />Colorado Springs, Colorado. This report describes and documents the work completed at this <br />location on the Cribbs -Jackson property. A vicinity map of this location is shown in Figure 1 <br />and coordinates of the three subsidence areas are found in Table 1. <br />Three subsidence areas located in close proximity to each other at one location were partially <br />filled. These three areas consist of areas of subsidence which formed depressions of the soil <br />surface of about 3-5 feet deep on average. The center subsidence (SH3) had an area adjacent the <br />break in the soil surface that could have allowed access to underground by small animals. The <br />other two locations (SI -11) the west area and SH2 the east subsidence area did not have apparent <br />access to underground when viewed February 9, 2015. <br />Methods and Results <br />Repair subsidence areas <br />A photograph of each subsidence area was taken in August 2014 when first discovered before <br />work began and a photograph of each site was taken after work was completed to document <br />condition and repair. These areas were first viewed on August 1, 2014 by Mr. Al Weaver and <br />Mr. Rob Zuber. Daryl Mergen viewed this area on February 9, 2015 and the work of filling <br />these three areas was completed on June 23 and 26, 2015. The primary objective of this work <br />was to eliminate the underground access in SH3. . Cement mix, water, and rock were carried to <br />the site on an ATV. Because the size of these three subsidence areas and limited access to the <br />site with heavy equipment these three areas were only partially filled with rock, cement, and <br />some woody debris from nearby this site. <br />Subsidence area SH1 had about one ton of rock and woody material placed within the subsidence <br />area. Subsidence area SH2 had little rock and some woody debris placed to reduce water flow <br />through this area. The northern most subsidence area, SH3, had approximately two tons of rock <br />and woody debris placed within this area. Subsidence area SH3 was also filled with 960 pounds <br />of concrete. A review of the site on September 10, 2015 was made and no additional subsidence <br />had occurred since June 2015. <br />