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Hector Placer Mine <br />M- 2011 -009 <br />Addendum to Mining Plan <br />To Allow Use of Flocculent Chemical <br />April 10, 2015 <br />1. Background Data <br />Currently, the gold placer operation is using 2500 gallons per minute of water from the <br />site source to the pump which pumps this water to the sluice box used to collect the gold <br />particles. The slurry from the sluice is allowed to settle in a pond immediately downhill <br />of the sluice box The water is recycled into the sluice but the amount of settling time is <br />not sufficient to allow all fine particles to settle out, where dirtier water is then purrped <br />back to the sluice, reducing efficiency of gold recovery. <br />The gold operator has decided that a flocculent is the most efficient way to settle the <br />suspended solids. The following pages describe. the flocculent, which is an anionic wet <br />flocculent Hyperfloc AF852 produced by Hychem, Inc. Of California. This chemical is not <br />harmful to fish or other animals unless it is dumped in U concentration directly into the <br />River in large quantities. See attached Material Data Safety Sheets. It is safer than many <br />other chemicals used for flocculating dirty water's today and the City of Denver is using it <br />in its -drinking water plants. <br />a <br />2. System Design <br />One 150 gallon tank of water will be set up adjacent to the sluice box, wherever it is <br />placed in the permit area. A 55 gallon steel drum of the Hyperfloc chemical will be set up <br />next to the 150 gallon water tank and the Hyperfloc chemical and water will be pumped <br />from both tanks using small pumps into a separate mixing tank as needed to allow the <br />proper mixing concentration. Since the flow rate in the sluice is constant, this will be easy <br />to accomplish. This mixing tank will be a heavy duty plastic 100 gallon tank. A fixed <br />