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6.3.3 Exhibit C <br /> Milling Plan <br /> The GTM is a precious metal recovery mill that will process mine spoils from <br /> historic or recently closed mines. Mining will not occur at the mill site. Milling will <br /> commence upon completion of mill construction, approximately six months from <br /> Division approval. The mill will be constructed within the historic mine disturbance. <br /> The anticipated life of the mill is 50 years. <br /> Material Characterization Process <br /> The purpose of the mill is to provide an option to owners of legacy mine spoils <br /> that will chemically remediate the spoils and potentially remove the material from <br /> the valley. To that end, SGLLC has prepared a milling agreement (Appendix F) that <br /> includes mine site to final deposition location tracking. SGLLC and NEI will accept <br /> material for milling only after both the mill and the material owner have a complete <br /> understanding of material characterization, potential special handling requirements <br /> and final byproduct location, beneficial end use or disposal. In addition, the owner <br /> will provide documentation that a mining permit was issued by the Division for the <br /> mine site from which the material will originate. <br /> Material owners will be required to characterize both the feedstock and <br /> byproduct materials and submit that characterization report to SGLLC and NEI as a <br /> precursor to SGLLC considering the material for milling. The owner will be <br /> responsible for the cost of any special handling or material disposal as a result of the <br /> characterization report. <br /> Material characterization will include at the least an acid base account (ABA) <br /> to determine the Net Neutralizing Potential (NNP) and Toxic Characteristic Leaching <br /> Procedure (TCLP) to determine if the material will require special handling and <br /> containment. Byproduct material with NNP >+20 will be a candidate for beneficial <br /> end use. SGLLC will submit application for a Beneficial Use Determination from CO <br /> Department of Public Health and Environment (CDPHE) Hazardous Waste <br /> Management Division. Byproduct material will be transported to the beneficial end <br /> use location upon receipt of the BUD approval. <br /> GTM's goal is that byproducts will be appropriate for beneficial end uses. <br /> Byproducts will be tested against construction material standards (e.g. ASTM C 33- <br /> 03 (Appendix E)) for suitability for use in the construction industry. This may be a <br /> simple sieve test if the material is suitable for backfill. Included in Appendix A is a <br /> Letter of Intent from Mountain Property Builders to accept the mill fines for backfill. <br /> Mill Process <br /> GTM consists of a crushing circuit, a concentrate recovery system and a <br /> recirculating process water system. The mill was designed to process 20 tons/hour <br /> or 200 tons per day. Approximately 1000 tons or five days' worth of feedstock will <br /> be stockpiled on a concrete pad near the feed hopper. A loader will feed the crusher, <br /> the beginning of the mill process. Two products will be exported from the site: <br /> byproduct materials that may be suitable for construction industry use and precious <br /> metal containing concentrate. The construction material, after passing through the <br /> dewatering screw, will be conveyed onto a concrete pad for stockpiling. The <br /> concentrate will be collected in 55-gallon drums and stored awaiting shipment to the <br /> refinery. <br /> Page 5 of 23 <br />