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Mayday Mine and Mill Site, Wildcat Mining Corporation, 110(2) Permit Amendment <br />Exhibit C <br />• to administer the terms and conditions of the water right decree. Reports will be prepared and <br />submitted as outlined in the court decree. <br />(k) Handling and Disposal of Acid/Toxic Producing Materials <br />Waste rock (exclusive of the material that remains in the settling pond) will be returned to <br />historical stopes or used as backfill after processing within the Mayday Stope (See Attachment C- <br />1 Page 15, Christensen, 2007, May). To ensure that future waste rock characteristics do not <br />adversely impact groundwater resources, a representative sample will be collected for every 1,000 <br />ton of processed ore. A composite sample will be prepared for every 5,000 ton of processed ore <br />and submitted for analysis of Net Acid Generation (NAG) production. Sampling and analysis will <br />cease when eight samples document results suggest groundwater or surface water quality will not <br />be adversely impacted by the mining and milling process. <br />(1) Protection of Hydrologic Balance <br />Surface water impacts have been, or will be mitigated, using erosion and sedimentation Best <br />Management Practices (BMPs) (Attachment C -6) and by managing approved water rights in <br />accordance with the Water Court decree (Attachment C -3). <br />The Mayday mine facility is a no- discharge facility thus minimizing any concern with potential <br />impacts to surface water. Impacts from acid mine drainage or adverse impacts to or from <br />groundwater is not anticipated. Sample testing will be conducted to confirm preliminary findings <br />that adverse impacts to water quality will not occur. <br />(m) Ore Processing <br />The on -site mill has an operating capacity ranging from 35 to 100 tons per day, with a maximum <br />• annual production of 9,100 tons. The on -site mill and processing equipment are located <br />underground (Exhibit E -5; Rule 6.3.3(1)(m)). Processing will operate 24 hours a day, 7 days a <br />week. Processing will utilize a jaw and cone 2 -stage crushing circuit with a closed circuit <br />vibrating screen. The crushed ore will be mixed with soda - reagents (see below) and ground into <br />slurry using rod and ball mills that lead to a mineral concentrator. The overflow from both <br />activities will pass over a classifier (sieve bend), where the coarse sand will be re -run through the <br />ball mill for further grinding and the fines will be treated by flotation. <br />The host rock and tails are considered non acid producing and will not mobilize metals or <br />leachates to impact groundwater or will impact human health or the environment. (Rules 3.1.5 <br />through 3.1.7). Insignificant amount of chemicals (as discussed below) will be used and recycled <br />in relation to the amount of ore processed; therefore no impacts are anticipated from mill <br />processing activities. Groundwater will be monitored quarterly (Figure E -6) to determine if <br />chemicals or leaching could or has impacted groundwater or springs directly related to the <br />mining, milling and processing activities. <br />No toxic or acidic reagents will be used in the grinding or flotation processes that will be used in <br />concentrations that will be used to adversely impact human health and the environment (See <br />MSDS and Chemical Descriptive Uses). The sequence, type, and quantity of reagents to be used <br />are as follows: <br />• At the rod mill, 2 -31bs of soda ash and <0.25 lbs of sodium silicate will be added for <br />each ton of crushed feed. <br />March 12, 2010 Amendment M- 1981 -185 <br />01 <br />