2009-09-25_PERMIT FILE - M2009076 (31)

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• 6.4.20(5) There are no Designated Chemicals to be used in this operation. Refer to Exhibit C, 63.3(2)(a) for a list of non- designated chemicals to be used. There is also a complete collection of MSDS for these chemicals at the end of Exhibit C. 6.4.20(6)(a) Again, there are no Designated Chemicals to be used in this operation. There is handling of potentially acid-forming material as the pre-existing waste rock is moved from it's current location (Exhibit E) to the Mobile Mill Site Crusher Feed Pile. This material is being moved using a combination of track-type excavator, rubber tired wheel loader, and/or dump truck. After construction of the Concrete Leachate Collection Barrier, Sediment Collection Pond and the Diversion Ditches, sufficient Best Management Practice elements are in place to mitigate any run-off while the piles are being removed. Operators are instructed not to broaden the pre-existing footprint of the pile and keep it within the Diversion Ditch boundary. As the material is being transported to the Mobile Mill Site, the operator is to be trained not to overfill/overload the loader and/or dump truck to prevent spilling of material unnecessarily. Any loose material on bed rails, bumpers, etc. is to broomed off at the load site to keep it from spilling off on the road. Should a spill occur, the operator is to be trained to stop the machine and shovel up any spilled material back into their loader/dump truck for transport to the Crusher Feed Pile. Once at the Crusher Feed Pile, the operator is to be trained to dump the load entirely within the confines of the concrete pad and containment berm of the same. The Crusher Feed Pile is designed to contain any potential acidic runoff and/or seepage. A maximum of 200 tons of material can be contained in this area for any period of time. The surface of this area is concrete paved to prevent any acidic run-off and potential seepage. Additionally, the surface slopes '/4" -1' towards the rear where a 8" wide x 24" high concrete wall provides a berm to contain any run-off or • sedimentation. A 10 year/ 24-hour storm event (2.6" as reported by NOAA Atlas 2, Vol. III) on this pile is capable of being contained here. The Crushing Plant operations are established to completely consume (on a daily basis) any material contained in the Crusher Feed Bin to limit exposure. All of the crushed rock is stored in a Crushed Rock Bin. This bin can hold 80 tons of material. A removable roof covers the bin to keep the weather out and prevent any acidic runoff. The gravity and flotation concentrate products that are collected and stored in Intermediate Bulk Shipping Containers which are palletized polyethylene containers surrounded by a steel skeleton framework for protection from impact and crushing. These containers measure approximately 42" cubic. It shall be noted these containers meet stringent DOT standards for transporting this specific material. Please refer to the explicit operating parameters in Exhibit C, 63.3(1)(k) for more information. Additionally, Exhibit D, 6.3.4(1)(e) specifies decommissioning and reclamation measures for the Mobile Mill Site. The Tailings Impoundment contains processed tailings that are non-acid forming. Refer to the waste stream characterization contained in the appendix of Exhibit C. There is no acid mine drainage from any adits, tunnels, or underground mine workings on this site either pre- existing or proposed. 6.4.20(6)(b)(i) There are no Designated Chemicals to be used in this operation. Refer to Exhibit C, 633(2)(a) for a list of non- designated chemicals to be used. There is also a complete collection of MSDS for these chemicals at the end of Exhibit C. There are no extractive metallurgical processes proposed as part of this operation, only gravity and flotation concentration methods. •