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Response to DRMS Adequacy Review — Cotter JD -8 Mine Reclamation Plan Amendment <br />Revised Exhibit D <br />Mining Plan <br />JD -8 Mine Permit Amendment <br />Response to Adequacy Review <br />M- 1984 -014 <br />The mining method that has been used and is planned for future efforts at the JD -8 Mine <br />is random room and pillar mining following development to areas of ore potential. Ore <br />production has ranged from 50 to 250 tons per day. No changes to the production rates <br />are anticipated. Waste material produced as a result of the production and development <br />activities has ranged from 50 to 350 tons per day. It is anticipated that these rates will <br />continue, although as stopes become mined out, as much waste material as possible will <br />be gobbed in the mined out stopes. <br />Mining of the ore is generally accomplished by `split - shooting' the ore and the associated <br />waste material. During the `split- shooting' effort the drill round is completely drilled, the <br />drillholes are probed to determine where the break between ore and waste material is, <br />then the waste material is blasted and removed. Once the waste material is removed, the <br />ore material is blasted and removed to the ore stockpile area. <br />Water diversions and impoundments will be covered in the attached Environmental <br />Protection Plan. <br />The surface area where the mine waste is currently being stored is approximately 11 acres <br />on the Doagy No. 2 and Opera Box claims. This area will continue to be used for mine <br />waste storage, topsoil storage, a temporary ore storage pad, and a shop /dry facility. The <br />proposed affected acreage on the JD -8 lease tract has not had any impacts from the <br />current mining operation. As a result of a re- design of the lower mine waste dump it is <br />anticipated that the proposed affected area on top of Monogram Mesa for the mine waste <br />dump and ore storage pad will not be required, but future exploration drilling may locate <br />sufficient resources to require the use of the upper mine waste area and ore storage pad. <br />The Environmental Protection Plan (EPP) that is being submitted as part of this <br />Amendment is being prepared for the affected surface area on the Doagy No. 2 and Opera <br />Box claims, the proposed vent hole locations on the JD -8 lease tract, and the associated <br />underground mine workings. If the upper mine waste area and ore storage pad is required <br />in the future an amendment with corresponding EPP will be prepared for this area prior to <br />any disturbance. <br />During construction of the upper portion of the lower mine waste dump the waste <br />material will be stacked in approximately ten -foot lifts, with six feet benches between the <br />crest of the lower lift and the toe of the upper lift. This will reduce the amount of <br />material that will need to be moved during the re- contouring process to achieve the final <br />2H:1V desired slope after mining is completed. <br />Considering that the JD -8 property has not been fully explored, and that economic factors <br />may affect the quantity of material mined from the underground workings the timetables <br />for the various phases are very rough estimates. The use of the lower mine waste area is <br />Page A -12 <br />