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To. DRMS Den Page 4 of 10 2016-08-31 16.05.58(GMT) 13032008630 From Greg Lewicki <br /> Addendum to Mining Plan to�illow Use of Flocculent Chemical <br /> Backaround Data <br /> Currently, the gold placer operation is using 1400 gallons per minute of water from the site source to the <br /> pump which pumps this water to the sluice box used to collect the gold particles The slurry from the <br /> sluice is allowed to settle in a pond immediately downhill of the sluice box. The water is recycled into <br /> the sluice but the amount of settling time is not sufficient to allow all fine particles to settle out, where <br /> dirtier water is then pumped 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 suspended solids. <br /> The following pages describe the flocculent,which is an anionic wet flocculent Hyperfloc AF852 <br /> produced by I lychem, Inc of California. This chemical is not harmful to lish or other animals unless it <br /> is dtunped in fall concentration directly into the River in large quantities. See attached Material Data <br /> Salety Sheets It is safer than many other chemical~ used liar flocculating dirty waters today and the City <br /> of Denver is using it in its drinking water plants. <br /> All of the activity described herein takes place within the currently approved permit and affected areas. <br /> System Desi o <br /> One 150-gallon tank of water will be set up adjacent to the sluice box, wherever it is placed in the permit <br /> area A 55-gallon steel drum of the Hyperfloc chemical will be set up next to the 150-gallon water tank <br /> and the I lyperfloc chemical and water will be pumped from both tanks using small pumps into a <br /> separate mixing tank as needed to allow the proper mixing concentration. Since the flow rate in the <br /> sluice is constant, this will be easy to accomplish. This mixing tank will be a heavy duty plastic 100- <br /> gallon tank. A fixed mixer will accomplish the thorough mixing. A small valve and garden hose type <br /> pipe will allow the mixed solution to flow to the sluice box where the mixture will be allowed to enter <br /> the slurry from the sluice where the flocculation of the fine particles in the sluice tails pond will take <br /> place. The chemical is used in very-small quantities and the solids should settle very rapidly, based on <br /> experience at other sites. <br /> One 55 gallon drum of the Hyperfloc will be stored on site at any one time. The Hyperfloc -vt'ill be stored <br /> in the drum within 50 feet of the sluice so that it can be mixed and applied to the sluice tails within a <br /> short distance. <br /> Water flows from the sluice into a ditch which carries the water by gravity to the sluice pond. <br />