2022-11-22_REVISION - M2015030 (2)

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Chavers Mining Resource DRMS Permit No.M-2015-030 Amendment No.2(AM-02) November 2022 Page 15 6.4.7 EXHIBIT G - WATER INFORMATION 6.4.7(1) IF OPERATION IS NOT EXPECTED TO DIRECTLY AFFECT SURFACE OR GROUNDWATER Not applicable. 6.4.7(2) IF OPERATION IS EXPECTED TO DIRECTLY AFFECT SURFACE OR GROUNDWATER 6.4.7(2)(a) Surface Water and Groundwater Systems Affected by Operation With this Amendment (AM-02), no change will occur to the surface water and groundwater systems directly affected previously identified. Operations at the Chavers Mining Resource affect surface water associated with the South Platte River located to the west of the mine and groundwater associated with the South Platte River alluvial aquifer(i.e.,uppermost aquifer). 6.4.7(2)(b) Known Aquifers South Platte River alluvial aquifer(unnamed aquifer). 6.4.7(2)(c) Dewatering Operations and Runoff Mine process water, which includes groundwater from the dewatering operations and stormwater that collects in the mine pit, is directed into a settling basin within the pit to allow fine sediments to settle out before being pumped for discharge to the South Platte River. ASCI will maintain a topography at the Site to direct stormwater runoff from disturbed areas, piled material, and operating surfaces that is not collected in the mine pit to areas within the permit boundary where the water can percolate into the ground. 6.4.7(3) PROJECT WATER REQUIREMENTS ASCI submits SWSPs annually to the Colorado Division of Water Resources(DWR)for approval to refine the estimated project water requirements each year based upon the anticipated site conditions as mining and/or reclamation progresses.The current approved SWSP estimates project water requirements will be 51.20 acre-feet over the 12-month period covered by the plan (August 2022 to July 2023). 6.4.7(4) REPLACEMENT WATER SOURCES ASCI utilizes a long-standing relationship with the City of Aurora to supply the project water requirements. Currently,ASCI holds a water lease with the City of Aurora to supply replacement water for the Site from 2022 through 2026. ASCI will continue to utilize this relationship throughout mining and reclamation of the mine.