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r ~~ ~ ~ <br />-2- <br />ek <br />c 8. Please verify that the volume of reagents used during the milling <br />process will be adequately contained (sump capacity, height of curbing, <br />etc.). <br />bk 9. The mill as proposed will include a final flotation cleanup circuit to <br />depress pyrite. Please describe the method and reagents to be used in <br />the final cleanup circuit. <br />~ 10. The 1200' plastic pipeline which will run from the well in the SE 1/4 <br />~r~ of Section 28 to the Mill facility should be included in the mine plan <br />map, Exhibit E. Is the well hydrologically upgradient or downgradient <br />from the proposed tailings disposal area? Please address. ~,,,.,,,,/~ ~,~-~~~ , <br />v ~a,oo <br />o k 11. The applicant has stated that 4.6 acres of tailings disposal is ~/y, <br />adequate in size to accommodate tailings disposal needs for 10 years at ~` <br />a proposed rate of full production of 125 tons per day. Are these <br />calculations based on a flow rate of 82 gallons per minute and a solids <br />content of 22 percent for the tailings slurry? The life of mine was <br />mentioned to be 12 years. Will there be mi]] tailings produced during <br />years 11 and 12? Will a larger tailings disposal area be necessary? <br />Please address. <br />~ 12. a. Please demonstrate that impacts of tailings disposal on surface and <br />ground water resources will be minimized. In particular, a surface <br />water diversion adequate to convey runoff from a 23-year, 24-hour <br />storm around the tailings disposal area should be installed. <br />b. Exhibit E - Map MLRD1 shows a naturaily occurring drainage channel <br />which flows directly into the 4.6 acre tailings disposal area. <br />Please amend Exhibit E to show a surface water diversion around the <br />disposal area and include hydrologic design and supporting <br />calculations. Define the minor changes which will be made to the <br />channel during final reclamation. <br />c. Please provide any geochemical testing data which may have been <br />collected to date. If not available a representative sample of <br />tailings solids and decant solution should be collected and <br />analyzed for acid-base potential, pH, Pb, Zn, Cu, Cd, As, Ni, Ag, <br />Al and Mn. Dissolved metals should be run on the liquid fraction. <br />Results should be provided within 90 days of the initiation of <br />milling. <br />d. The Division agrees with the recommendations of CTL/Thompson for <br />construction of the tailings disposal area. Please address whether <br />a synthetic liner will be necessary based on the average soil <br />permeabilities defined in the permeability study and the <br />geochemical analysis. <br />~D - ~ <~. <br />~SF~ <br />