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• Utilizing strict pH monitoring of the process waste stream, there are reasonable assurances to prevent impounding <br />waste containing un-removed acid forming constituents (in this case sulfide minerals and heavy metals). This is <br />further elaborated in Exhibit C. <br />None of the chemicals added as part of the process (refer to Exhibit C, 6.3.3(2)(a)) are listed as Designated <br />Chemicals and the source water for the process is municipal drinking water. The condition of the newly processed <br />tailings can only be bettered by this process when compared to their initial, pre-existing state. <br />6.4.20(l)(c)(iii) <br />same as 6.4.20(1)(c)(iH) <br />6.4.20(1)(c)(iv) <br />There will be no newly placed waste rock piles as part of the proposed operations. <br />There is, however, pre-existing abandoned waste rock (amounting to approx. 8,000 tons) located in the area of the <br />proposed Tailings Impoundment. As described above, this operation will be processing this material to extract the <br />acid forming constituents. <br />6.4.20(l)(c)(v) <br />There will be a temporary daily stockpile located at the Mobile Mill Site. The Crusher Feed Pile will hold a <br />multiple day's stockpile of feedstock for the mobile crushing plant. A maximum of 200 tons of material can be <br />contained in this area for any period of time. The surface of this area is concrete paved to prevent any acidic run-off <br />and potential seepage. Additionally, the surface slopes '/4" -1' towards the rear where a 8" wide x 24" high <br />concrete wall provides a berm to contain any run-off or sedimentation. A 10 year/ 24-hour storm event (2.6" as <br />reported by NOAA Atlas 2, Vol. III) on this pile is capable of being contained here. <br />• 6.4.20(1)(c)(vi) <br />There will be no other application of material at other land sites. <br />6.4.20(2) <br />Refer to the maps within Exhibit A and E for locations of pre-existing acid-forming materials and the earlier <br />mentioned Crusher Feed Pile. <br />6.4.20(3) <br />There are no other known requirements for other environmental protection measures from other jurisdictions at this <br />location. <br />The groundwater generated from drainage of this area is hydraulically connected to the Big Five Tunnel, which lies <br />directly beneath the Tailings Impoundment. The EPA currently is doing extensive monitoring of this groundwater. <br />The Big Five Tunnel drainage is monitored, collected, and pumped to the Argo Tunnel Treatment Facility located in <br />Idaho Springs. The proposed operation will NOT adversely affect this monitoring, and as time goes forward they <br />should begin to see an improvement in quality because we are removing the point sources of acid runoff. <br />6.4.20(4)(a) <br />There are no other known permits or local licenses needed in order to proceed with operations concerning the <br />handling of potentially acid-forming, pre-existing waste rock. Again, no designated chemicals are being used as part <br />of operations. <br />There is no water discharged from this process, therefore no discharge permits from the State are required. An Air <br />Quality Emissions Permit will not be necessary because emissions are well underneath the CDPHE APEN <br />thresholds. <br />Venture Resources initially applied to the CDPHE Solid Waste Division for the Tailings Impoundment, but they <br />subsequently deferred our project to the DRMS; therefore, it is safe to say the CDPHE isn't particularly interested in <br />. our new waste impoundment. No hazardous wastes are handled as part of this operation.