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Mined material with a specific gravity greater than 1.6 is considered to be coal processing waste. <br /> This is known as "sink" material, and samples of it were submitted to commercial laboratories for <br /> chemical analyses as required by the Code of Colorado Regulations (2.04.6(2) and 4.09.1(12)(b). <br /> The results of the analyses are included in Appendix 9 of Section I I.B. <br /> TR-74 (4/2022) IV-2 0 <br />