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b) It is believed that the residence time within the current pond and seepage through the waste <br />rock provides some benefit to the mine water. Zinc is the dissolved metal of most concern at <br />Revenue. Sampling of water before the pond (UG -2) and at the Seep (SW -3) below the <br />pond shows a decrease in zinc values. It is believed that the Seep is the discharge from the <br />pond since they are approximately the same flow rates and no other discharge is visible <br />from the pond. Since this pond will be removed as part of the construction of the Revenue <br />waste pile, it will no longer be providing a location for seepage into the waste rock.. The <br />mine water will be piped from underground into a perforated pipe buried eight feet below <br />the existing waste rock pile surface, as shown on Maps C -2 and C -3. This will allow the <br />mine water to benefit from passing through the waste rock as it is now. This water will <br />remain as ground water and should not emerge on the surface in a visible manner. <br />c) The third method of improving the mine water quality will be source control within the <br />underground mine. Areas that generate water that are high in dissolved metals may be <br />sealed off to prevent these flows from joining the Revenue water and being discharged. In <br />particular, the Atlas drift may be sealed since it has a low flow of poor water quality. See <br />Exhibit G for details. If a seal is employed, the seal will be reinforced concrete and designed <br />to hold the maximum water head behind the seal with a significant safety factor. It is <br />extremely unlikely that this seal will result in this water showing up anywhere else since the <br />water is coming from the Atlas vein itself and the actual Atlas Mine workings are more than <br />250 vertical feet above the short drift. <br />Revenue Mine August 2012 T -7 <br />