2021-09-27_REVISION - M1990057 - Laserfiche WebLink

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Mr. Dustin Czapla 13 CDRMS September 24, 2021 (a) Such evaluations shall be site specific and appropriate for the types of materials exposed or to be exposed by the mining and reclamation operations. (b) Such evaluations shall be conducted on materials that are representative of the composition of the mineral, rocks or materials that are exposed or to be exposed during the proposed life of the mining operations. (c) Such evaluations shall be appropriate for the intended use or fate of the material exposed or to be exposed during the proposed life of the mining operations, and on a case-by-case basis shall include evaluation of weathering effects, shall simulate, to the extent reasonable, the conditions under which the material will be used, stockpiled or disposed and which shall reasonably be expected to prevail after mining and reclamation operations have ceased. (d) Such evaluations shall be performed on both ore and overburden, and shall identify the most reasonable sources, probable fate, and transport mechanisms of metal and acid- producing minerals that may be mobilized by ordinary weathering reactions that are likely to prevail after mining and reclamation operations have ceased. Such analyses may include only those tests that are necessary to satisfy the conditions of Rule 6.4.21(14)(c), and such evaluations may be prioritized, in descending order of importance, as follows: (i) mineralogical analyses; (ii) trace element analyses; (iii) major element analyses; (iv) microprobe or other comparable analyses. (e) Where a net neutralizing, metal adsorption or metal ion exchange potential over the long-term cannot be demonstrated, the Operator/Applicant shall fully describe measures to prevent unpermitted discharges, and how reclamation, sufficient to achieve the post-mine land use will be assured. Response The geochemical characteristics of the material to be processed is yet to be determined. Processed ore will be deposited in the TSF in an alkaline (pH >8) slurry in a non-discharging structure. The slurry will have a moisture content equal to or less than 30% and over time the material will desiccate and compact to form a mineral waste encapsulated mass. There is little probability the encapsulated mass has the potential to cause acid mine drainage or to release designated chemicals, or toxic or acid-forming materials. 21. Rule 6.4.21 EXHIBIT U—Environmental Protection Plan -Construction Schedule Information Pursuant to Rule 6.4.21(15) please provide a detailed construction schedule for the following: (a) all facilities designed to contain or transport toxic or acid-forming materials or designated chemicals used in the extractive metallurgical process; and (b) all facilities proposed to contain, hold, or for disposal of material that has the potential to cause acid mine drainage.