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Technical Revision 15 (TR-15) <br /> TR-15 was submitted in June 2021. This revision sought recertification of the mill. Certification <br /> approval of the mill was originally granted by DRMS on January 11, 2016. Updates to the <br /> milling process as described in TR-09 were approved in March 2017. Supporting information for <br /> the mill recertification included mill design discussion; mill construction, modification, and test <br /> operations; water and slurry handling systems and environmental protections; chemical handling <br /> and containment systems; tailing chemistry; and water quality at the tailings embankment. This <br /> revision is currently in progress. <br /> Technical Revision 16 (TR-16) <br /> TR-16 was submitted in July 2021. This revision requested approval to construct two equipment <br /> storage warehouses and a security building at the mine entrance, place temporary lineout <br /> buildings on the surface, construct a vehicle washdown area near the mechanic shop, and place <br /> temporary generators and a 10,000-gallon fuel tank on the surface. <br /> TR-16 is approved, and the infrastructure permitted by TR-16 is currently being constructed. <br /> Revenue Mine December 2021 5 <br />