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M MW Sorter <br /> VV <br /> placed as final cover to enhance revegetation success and re-vegetated with the approved native seed <br /> mix. <br /> If sufficient fine-grained cover is not located around the South London Stockpile footprint, fine grained <br /> material will be imported to achieve at least 3"of cover over the South London Stockpile area. <br /> EXHIBIT D—Reclamation Plan(Rule 6.3.4): <br /> DBMS (Item #16): In response to Notice of Deficiency Item 5, the Applicant addressed Rule 6.3.4(1)(f), <br /> including a discussion on the applicability of Rules 3.1.6(1)(f)-(h)for the proposed operation. Please discuss <br /> how the Applicant will demonstrate the proposed mining operation will complement the ongoing water <br /> treatment program and is expected improvement of water quality. This demonstration could be to comply <br /> with Rule 6.4.21(9) and then commit to providing groundwater data through the life of mine prior to <br /> treatment and discharge. <br /> MW Sorter(Item#16 Response): MineWater LLC has implemented in-situ treatment in the London Mine <br /> Water Tunnel to precipitate zinc contamination since 2018. Please see Exhibit D Appendix A for example <br /> cover letters from six months of Discharge Monitoring Report submittals. <br /> Source treatment has improved quality of drainage from the source area by more than 90%since 2016. <br /> We expect that removal of more than 40,000 tons of ore-grade materials surrounding the London Mine <br /> outfall 001 will improve water quality further.Quarterly monitoring will be conducted,and reports on the <br /> in-place water quality draining from the Mine Water Tunnel will be provided to the DRMS, along with <br /> results for the downgradient water quality at South Mosquito Creek(SMC003), which are also provided <br /> to CDPHE and are subject to the CDPS Permit No. C00038334 and subject to Compliance Order and <br /> Settlement Agreement IC160803.Zinc concentration in drainage from the Water Tunnel is shown below: <br /> Concentration <br /> Late;Mi—.9 Reports T, eI M <br /> Mon-Numeric Value Timeime <br /> 3000 <br /> 2500 ♦ <br /> T 2000 <br /> O <br /> 1500 O <br /> 1060 O O O <br /> ---------------- <br /> 'Ort►---------------------------------- <br /> May 18 Seo 18 Jan 19 May 19 Se0-19 Jan 20 May _ Szp 20 a, _. Ila, 21 ep 21 Ian 22 22 Sep <br /> —ROLL AVG LIMIT ♦ ROLL AVG <br /> For reference, when MineWater started cleanup activities at the London Mine in August 2016, the zinc <br /> concentration draining from the Tunnel was over 4,800 ug/L. It is now consistently below 250 ug/L. <br /> 7 1 P a g e <br />