Laserfiche WebLink
Mr. Dustin Czapla 6 <br /> CDRMS <br /> September 24, 2021 <br /> (iii) describes how the Operator/Applicant will prevent adverse off-site impacts <br /> during periods of active mine site operations and periods of Temporary Cessation. <br /> Response <br /> Tailings will be discharged to the TSF at a pH greater than 8. Acid producing minerals and <br /> potential acid mine drainage concerns are naturally mitigated during the milling process. <br /> During milling and periods of temporary cessation the facility will be inspected, maintained, and <br /> monitored by trained personnel in accordance with the mine and other regulatory permit <br /> commitments and stipulations. <br /> 13. Rule 6.4.21 EXHIBIT U — Environmental Protection Plan — Facilities Evaluation <br /> The Division considers the mill and tailings storage facility to be "Environmental <br /> Protection Plan facilities". Pursuant to Rule 6.4.21 (7) please provide a separate <br /> evaluation for each of these facilities, describing the expected effectiveness of each <br /> facility, taking into consideration the following: <br /> a) site-specific conditions; <br /> Response <br /> TSF <br /> The geology', soils and site hydrogeology characteristics are well suited for siting and operating <br /> the TSF. (See Geology Rule 6.4.9 Exhibit I, Soils Information, Appendix 9-1); Surface Water <br /> (Section 21 Rule 6.4.21 Exhibit U 21-1, 21.10, 21.11) and groundwater(Section 7.0 Rule 6.4.7 <br /> Exhibit G, Section 21 Rule 6.4.21 Exhibit U 21-8 and 21-9). See Figure 3-5 (Groundwater wells <br /> within 2.0 miles of the Mill, Figure 3-6 EPA Surface & Groundwater Monitoring Locations. Also <br /> see the attached Figure 9-1 (Geologic Map of Lake County) and Figure 9-2 (Generalized <br /> Stratigraphic Column of Lake County). <br /> (b) designated chemicals, acid mine drainage and toxic or acid-forming materials <br /> and associated by-products and sludges that will be retained, either temporarily or <br /> permanently, on site by each facility; <br /> Response <br /> The designated chemicals listed in Table 4-9 of the permit document will be retained at the Mill <br /> facility as described. Basic (pH > 8.0) process chemicals will be used during the milling prosses <br /> which mitigates the potential to generate acid mine drainage. <br /> ■ The ore, upon arriving on site will be placed in a bunker for containment, and to prevent <br /> surface drainage from causing acid runoff. The ore will be loaded into our facility via <br /> front end loader, and the loading area will be cleaned daily. <br /> ■ Crushing will be completed inside a building, which will effectively contain and prevent <br /> the ore from entering or interacting with the environment. With this containment, and a <br /> dust collection system, we will have strong control of the dry ore. <br /> ■ The ore will then be moved via conveyor to the fine ore bin in the main building, where it <br /> will then be conveyed to our ball mill, which will have a floor sump to collect any spillage, <br /> keeping control of the now wet material. The slurry will then be pumped to a thickener <br /> then our leach tanks outdoors, which will be protected by a slab with curbs, and a floor <br /> sump. <br /> Identifying fractures in till [unconsolidated sands,gravels,and clays],outwash deposits, moraines is difficult or <br /> impossible.Glacial deposits have an extremely low earthquake and flooding risks. <br />