2013-12-19_REVISION - M1990057 - Laserfiche WebLink

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rvr� Re-� The Union Milling Company P.O. Box 620490 99" Littleton, CO 80162 -0490 +1.303.947.3499 19 December, 2013 Mr. Michael Cunningham RFr, Environmental Protection Specialist Division of Reclamation, Mining and Safety DEC 19 2013 Department of Natural Resources 1313 Sherman Street, Room 215 Division of Keuan ation, Denver, CO 80203 Mining & Safety michael.cunninaham @ state.co.us RE: Leadville Mill; M1990 -057, Amendment Review No.1 — Question 24 Response Dear Mr. Cunningham, Following is Union Milling Company's (UMC) response to Adequacy Review No. 1 question 24. This completes our AR 1 responses. 24. The Reclamation Plan calls for conducting geochemical characterization of the tailings prior to placement of the topsoil cap. Please specify the geochemical analyses the Operator intends to conduct. Response: UMC will include the following text addressing geochemical characterization in the Permit Document Initial Testing Prior to accepting each production run ( "Batch ") of toll ore ( "RoM ") to be treated at the mill, UMC will require that it be tested to assure it meets pre- specified Acceptance Criteria. For each Batch, Acceptance Criteria will include testing to assure that RoM: A. Can be economically processed within the operating limits of the mill; and B. Meets mill facility permitted conditions. Acceptance testing will be performed by an independent laboratory before the RoM arrives on -site. The process will be as follows: 1. Seller and Buyer agree to "Economic Terms ". E.g. payment based on RoM grade, process recovery, market prices, treatment costs, etc. 2. Batch of RoM to be processed is identified. This may, for example, be a specific stope in a mine, or a stockpile of RoM on the surface. 3. The Batch is surveyed to determine quantity and to collect a Representative Sample.