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Appendix D <br /> Knight Piesold <br /> CONSULTING <br /> June 29,2021 Knight Piesold and Co. <br /> 1999 Broadway, Suite 900 <br /> Denver, CO 80202-5706 <br /> Peter Hayes, T+1 303 629 8788 <br /> Department of Reclamation, Mining and Safety E denver@knightpiesold.com <br /> 1313 Sherman St, Room 215 www.knightpiesold.com <br /> Denver CO, 80203 <br /> Project No.: DV101-00812/01 <br /> Doc. No.: DV-21-0775 <br /> Re: Gladstone Toll Mill Application; M2021-007,Appendix D Review <br /> Responses to DRMS Observations <br /> Dear Mr. Hayes, <br /> The following letter is Knight Piesold's response to Patrick Lennberg's review of the waste characterization <br /> dated April 8,2021,conducted in support of the permitting process for the Gladstone Mill Project located in <br /> Idaho Spring, Colorado. <br /> 1.0 QUESTIONS AND RESPONSES <br /> Question 1: On Figure 2 there is a Pile 4 located northwest of Pile 3, why was this waste rock pile <br /> not sampled? <br /> KP Response: <br /> As discussed in our call on May 28, 2021,with Patrick Lennberg and Peter Hayes from Colorado Division <br /> of Reclamation, Mining, and Safety (DRMS), Angela Bellantoni, and Cynthia Parnow from Knight Piesold, <br /> this pile was not sampled as there was a broken piece of equipment that prevented access to this pile. <br /> Question 2: What are the dimensions and approximate volumes of each of the four waste rock <br /> piles? <br /> KP Response: <br /> Attachment 1 illustrates a plan view of the piles. The approximate dimensions, volumes, and weights of <br /> the piles are as follows: <br /> • Pile 1. Dimensions 45 ft long and 25 ft wide.Volume: 20,950 ft3. Weight: 1,070 tons <br /> • Pile 2. Dimensions 75 ft long and 45 ft wide. Volume: 63,100 ft3.Weight: 3,220 tons <br /> • Pile 3. Dimensions 40 ft long and 35 ft wide.Volume: 26,130 ft3.Weight: 1,330 tons. <br /> • Pile 4. Dimensions 40 ft long and 10 ft wide.Volume: 7,416 ft3. Weight: 380 tons. <br /> Pile dimensions were calculated using satellite imagery. Pile volumes were calculated assuming the <br /> piles have a combined weight of 6,000 tons (Jeff Carter, Personal Communication, 2021) and with a <br /> rock density of 1.8 ton/m3. <br /> Management System Certified by: <br /> J" 0 <br /> 90012015 140012015 om�.mw <br /> Management Maaagemart Matugd'wR <br /> F9 5lSB81 BJ9 SlYat (M19 S!`0.1 <br />