Laserfiche WebLink
gallery from the mill tunnel. All of these items are shown on the attached Map 1. The engineering plans for the <br />mill were designed by CH2MHiIl in Denver, Colorado. Plans were based on samples of the ore and production <br />targets for the mine and mill. Drilling and blasting of the tunnels was started in March of 2013. Initial completion <br />of the mill concrete flooring, crushers, screens, ball mill, flotation cells, water handling systems, filter presses, <br />control room, reagent storage and electrical room occurred in April of 2014. <br />The general plan view for the mill operation is enclosed as Map 1. It is divided into three views, 1- the general <br />view of all areas, 2- details of the mill tunnel and 3- details of the filter building and thickener. The ore is <br />transported by mine cars to the slusher tunnel withCoarse Ore Bin, which has the rail siding above the crushing <br />gallery. Here the ore cars are side dumped to a long, narrow holding area, where a slusher gathers the ore and <br />delivers it to a spiral chute, which leads to a pan feeder, which feeds a conveyor leading to the main crushing <br />gallery, where the ore enters a jaw crusher, followed by a cone crusher. Most of the material leaving the Jaw <br />crusher is -3/8". A conveyor from this Jaw crusher leads to a 3/8" screen where the oversize goes back to the <br />cone crusher for a second run. The undersize continues up the Fine Ore Bin incline tunnel where it feeds the 4 <br />story fine ore storage bin of approximately 300 tons. This material is then fed to the main concentrator gallery <br />or mill tunnel, where the -3/8" ore enters the ball mill for reduction to approximately 100 mesh size and lower. <br />This reduction takes place in a wet enclosed ball mill with many steel balls which grind the ore. All remaining <br />processes are fully wet from this point forward. The wet material from the ball mill is then moved to a <br />hydrocyclone where free gold is concentrated using its much higher density. The fine slurry from the <br />hydrocyclone is then moved to a Knelson Centrifugal Bowl where the free gold is further concentrated for sale. <br />The remaining material is then delivered to two conditioning tanks. It is also at this point that chemicals are <br />introduced into the processing stream to raise the pH and prepare for the concentrate separation in the <br />flotation cells. The series of rougher and cleaner flotation cells are then used to selectively remove zinc, lead, <br />copper and silver sulfides. <br />Sulfide concentrate is collected at the top of the flotation cells using traditional frothers and chemicals which <br />promote the flotation of the sulfides. The sulfide concentrates are collected at the top of the flotation cells and <br />are then passed into 2 filtrate tanks for final dewatering. The sulfide concentrates represent approximately 3%- <br />8% of the total starting ore material. The concentrates are then placed in super sacks for transport off site for <br />sale. <br />The tailings from the flotation cells are fine slurry of -100 mesh size, which are gathered in an 18,000 gallon tank <br />in the mill tunnel. The slurry at this point contains approximately 30% solids. From there, they are pumped to <br />the 26 feet diameter thickener, which is located outside the filter building. The thickener was not part of the <br />Revenue Mill Certification Page 4 of 20 <br />