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In 1959, Standard Metals Corporation reopened the Sunnyside <br />Mine, activated the Mayflower Mill, and installed new crushing and <br />. grinding circuits increasing mill capacity from 700 TPD to 1,000 7P0. <br />In addition to lead and zinc products a gold-silver amalgam was <br />added to the mill production scheme as a result of high gold and <br />silver heads contained in the Sunnyside Mine ores. A brief de- <br />scription of the milling process as currently eMp/oye-0l is presented <br />below: <br />Crushing -Mine ores are reduced to uniform size class (1"-3") <br />employing jaw and cone crushing equipment. <br />Grinding - The grinding step employs a 12x8 rod mill and an <br />8x6 ball mill for further reduction in ore size class. <br />Gravity Concentration - Upon achieving desired ore size classifica- <br />tion in the crushing and grinding circuits, the ore is slurried <br />and subjected to gravity concentration for gold and silver ex- <br />• traction. Shaking tables, and an hydraulic jig are used to <br />achieve this step. Jig concentrates are then subjected to e.n <br />amalgamation process for further concentration of gold and <:ilver <br />values _ <br />Flotation - After passing through the gravity concentration <br />circuit, the ore slurry is processed by differential flota- <br />tion for extraction of copper, lead and zinc values. A number <br />of chemical reagents are introduced to the mill slurry during <br />this phase of the operation to maximize recovery of the tar- <br />9eted products. <br />Thickening - Products removed from the ore slurry during f]otation <br />undergo primary moisture reduction by gravity thickening. <br />• <br />z4, <br />