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LONDON MINE <br /> M-2023-015 <br /> Exhibit U—Rule 6.4.21 <br /> Environmental Protection Plan <br /> The proposed operation was determined to possibly constitute a Designated Mining Operation (DMO), <br /> and as such,would require an Environmental Protection Plan (EPP) in addition to the Mining Plan and <br /> Reclamation Plan. Portions of this Rule pertaining to subjects not applicable to this site or operation will <br /> not be included in this plan. <br /> (1)(a) <br /> The determination was made based on the fact that the operation will handle mineralized pre-mined <br /> waste rock, which, potentially being toxic or acid-forming materials, exposes the site to these materials <br /> during mining or reclamation. (See definition in Rule 1.1(1).) <br /> (1)(c) <br /> There is no uranium, and there will be no acid mine drainage or designated chemicals at this site. <br /> (1)(e) <br /> There are currently impoundments,waste rock piles and other material stockpiles. The proposed mining <br /> and reclamation plans will create a site which provides net improvement to human health, property and <br /> the environment. <br /> (2) <br /> The mining and reclamation maps in Exhibit E contain the information required for the EPP maps under <br /> this rule. All applicable items, areas and features referred to in this EPP are shown on the maps. <br /> (4) <br /> Please see the list of other required permits and licenses contained in Exhibit F. <br /> (6) <br /> The procedures for disposal, detoxification and stabilization of toxic or acid-forming materials,the <br /> adequate reclamation practices, measures to prevent releases to the environment, and prevent <br /> discharges of acid mine drainage are all described in Exhibits C and D. <br /> The waste rock materials to be handled in this operation have been analyzed;the nature and constituent <br /> concentrations were considered in formulating the mining plan. The waste rock currently resides in a dry <br /> location,will be sorted as dry material, and once sorted, depending on resultant levels of mineralization, <br /> will be either exported from the site or disposed of onsite as dry material. No solutions will be created. <br /> The sorting process will dramatically reduce the level of metals and mineralization of the material, as <br /> well as the volume of the material,to be disposed of onsite. Sample analysis of the waste rock can be <br /> found below. <br /> (7) <br />