Laserfiche WebLink
Exhibit D <br />4. Addressing Rule 6.4.4(e)(ii), on page D -4 under item a., the exhibit states that waste rock <br />will be stacked to a height that will not impede grading to 3H: IV during reclamation. <br />Please provide the Division with the maximum anticipated thickness that waste rock will <br />be placed <br />The maximum anticipated thickness of the waste rock pile will be 35 ft. <br />5. Addressing Rule 6.4.4(e)(ii), on page D -5 under item b., the exhibit states that ore will be <br />piled up to a workable stockpile. Please provide the Division with a maximum anticipated <br />amount of ore to be stockpiled at any given time. <br />No more than 2,000 tons of ore will be stockpiled at any given time. <br />6. On Page D -5 under Item b, it is stated that the ore is not expected to have any adverse <br />leaching effect due to the limited time the ore is left on the pad What is the basis for this <br />statement regarding leachability and how will the operator ensure that the 30 day <br />maximum time for ore staging will be upheld during operation. <br />As discussed in the EPP, low precipitation rates and high evapotranspiration <br />rates result in no net infiltration for the region. Any precipitation falling on the <br />site would have to saturate the ore to at least the residual moisture content <br />before leachate could develop and enter the clay liner. The clay liner will <br />restrict any short term infiltration and keep potential leachate near the surface <br />where high evaporation rates will remove water during dry periods. Cotter's <br />mining procedures use a first in first out method of transporting ore from the <br />stockpile. The site foreman is responsible for enforcing this procedure. <br />2 <br />