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<br /> <br /> <br />• <br />• <br />May 19, 1997 <br />Lorencito Coal Company, LLC <br />c/o The Greystone Company <br />5990 Greenwood Plaza Boulevard, Suite 250 <br />Englewood, Colorado 80111 <br />Attention: Mr. Jerry Koblitz <br />Subject: Evaluation of Proposed Coal Waste <br />Proposed Lorencito Mine <br />Las Animas County, Colorado <br />Job No. 25,852 <br />Gentlemen: <br />~~~ <br />~~` I ~ <br />/ ~'~'~'~ <br />-~-~ i ~- <br />N.ew ~k (~,~~>.. ~„~ <br />r~S~~~S~ <br />This letter presents results of our laboratory testing and evaluation of coal <br />mine waste from the proposed Lorencito Mine in Las Animas County, Colorado. <br />CLT/Thompson, Inc. previously performed a Supplemental Stability Investigation, <br />Refuse Disposal Area, for Basin Resources Golden Eagle Mine, Westin, Colorado <br />(Job No. 22,478 dated May 10, 1995). The previous investigation included testing of <br />coal waste material derived from the Golden Eagle Mine and placed into the refuse <br />disposal area (RDA). The purpose of our current evaluation was to review the <br />properties of the coal waste previously created by the processing plant, perform <br />testing on a representative sample of the proposed waste from the Lorencito Mine, <br />and evaluate whether the proposed waste meets the strength criteria used to <br />evaluate the stability of the RDA. <br />Coal Waste Properties <br />The results of our laboratory testing on the proposed coal waste are <br />presented on Figs. 1 through 4. The sample tested was provided by CTBE and <br />represented material which was run through a 2-inch crusher and then processed <br />through a liquid with a specific gravity of 1.45. The material tested represented the <br />sink resulting from the separation process. We understand this is the break-point <br />anticipated for use in the coal waste in the processing plant. We also understand <br />that material finer than the No. 100 sieve will be removed during the processing and <br />will not be placed in the RDA. <br />Our previous investigation included a review of 22 gradation tests on coal <br />waste in the existing RDA. The average coal waste gradation based upon this review <br />is shown on Fig. 1. To simulate the larger particles in the Proctor and direct shear <br />CTL/THOMPSON, INC. <br />CONSULTING ENGINEERS <br />1971 WEST 12TH AVENUE ~ DENVER, COLORADO 80204 ~ (303) 825-0777 <br />