Laserfiche WebLink
when it is obtained and if possible please provide documentation of any local <br />government approval to allow the shed to remain as a permanent structure...." <br />RESPONSE: The Mount Sneffels Mining Company has noted DRMS's comment and will <br />forward all County permit agreements to the Durango Field Office as they come <br />available. <br />3. Cover Page, Fourth Paragraph "Exhibit C-Mining Plan (Rule 6.3.3) and First Page, First <br />Paragraph: "the underground repository.... it is imperative that the wooden bracing be <br />structurally adequate to withstand the pressure, that the liner be adequately anchored <br />to the bracing in the event that the volume is not monitored or pumped down... please <br />describe the methods of anchoring and sealing the liner and bulkhead bracing and the <br />name(s) specs of the liner materials... clarify whether there will be two cells..." <br />RESPONSE : The subgrade ore repository will be comprised of an historic tunnel <br />immediately adjacent to the underground milling operation that will contain two cells <br />isolated by bulkheads that are constructed of timbers, braced with mine-bolts (4 ft) and <br />cement blocking. The furthermost underground cell will be used for subgrade ore <br />storage, while the cell closest to the tunnel opening will be the 'backup' cell put in place <br />as a precautionary measure. Each bulkhead will be lined with geotextile/geomembrane <br />lining (Liner). The Liner will be folded over the top edge timber and laid down upon <br />itself thereby creating two layers underneath the collected water. The water will be <br />actively re-circulated therefore it is not anticipated to create a significant amount of <br />head pressure on the liner. Regardless, this 'double-back' layer approach should keep it <br />from folding back over. In addition, the liner will be sealed into the tunnel floor by <br />being 'toe-nailed' into the floor with materials backfilled and/or cemented along the <br />edge - thereby creating a seal with the floor itself. It is unknown of the liner will have to <br />be 'pieced' together based upon its anticipated flexibility. It is likely that the liner can be <br />kept in one piece. The specifications of the liner include : constructed with reinforced <br />polypropylene fabricated liner which has excellent tear and chemical corrosion <br />resistence along with the ability to contain water for indefinite periods. The liner will be <br />36 millimeter in thickness and will likely be obtained from "Western Environmental <br />Liner"/WA. <br />4. Pagel, Second Paragraph "Exhibit C-Mining Plan (Rule 6.3.3)": "The sediment ponds... <br />need to know.... depths and volumes...". <br />RESPONSE: The combined volume of the three ponds is approximately 3,187.5 cubic <br />feet assuming an average depth of 2.5 ft for each pond, and an average width of 15' for M <br />each pond; with the 'lengths' of each pond as follows: Pond A (closest to Portal) = 20' in b <br />a