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~~ ~. " C~ DIVISION OF MINERALS AND GEOLOGY Depanment of Natural Resources 1313 Sherman SL, Roum ?15 Denver, Coluradu tl0'O3 Phone: (3031 856-3567 FA%: 1303) 81:-7i 106 February 17, 2000 Mr Bill Lyle Battle Mountain Resources Inc PO Box 1627 Battle Mountain NV 89820 Re: Partial Approval of Technical Revision 26, San Luis Project, M-88-112 Deaz Mr. Lyle: DIVISION OF MINERALS GEOLOGY R E C L A M A T I O N MINING•SAf ETY B~II pwens Governor Greg E wolcne, Eeec W rvr Oveaor nnchael B. Long Division Director Per your request, the Division does hereby approve BMRI's proposal to initiate the Pink Gneiss pilot project. BMRI must submit lab results to the Division of the water quality samples collected at the Pink Gneiss monitoring wells within 30 days after receiving the results. BMRI must keep accurate records of the amount (and type) of cazbon material used in the pilot project. The records should be available to the Division upon request. If the EPA requires additional monitoring wells in the Pink Gneiss pit, BMRI must submit the well location, campletion, etc. data to the Division prior to, and after, the wells aze drilled. Also the Division does hereby provide tentative approval to BMRI to initiate they infiltration or injection system for placing processed water back into the West pit backfill groundwater system through either an infiltration trench (the existing system on the east side of the pltj or a series of injection wells (the existing monitoring wells), Final approval of the proposed infiltration or injection system will be issued when the Division receives and reviews the technical and geotechnical submittal for the "curtain wells" as was proposed in BMRI's January 3, 20001etter. BMRI must provide the locations of the "curtain wells", the anticipated depth of each welt (the depth should be sufficient to penetrate 5 to 10 feet of the underlying Santa Fe or pre-Cambrian), BMRI must show the anticipated area of influence from the cone of depression Qprimarily, the anticipated influence on the Rito Seco and/or the M-26 monitoring well), BMRI should submit the anticipated well completion information to the Division prior to drilling the "curtain wells" and BMRI must commit to submit a drillers log (or geologic log) to the Division within 30 days after the wells have been drilled and completed. In addition, BMRI must record the amount of water that is either allowed to infiltrate or is injected into the West pit backfill. 'Phe report must be submitted to the Division on a monthly basis. III IIIIIIIIIIIII III ~ STATE OF COLORADO If you have any questions, please give me a call.