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i ~ Lotter Lor{~nr7tion Colorado Department of Natural Resources January 25, 1978 Page Two The holding tank depicted in the attached Figure 1 represents t11e supply of treated water necessary for the ore washing process in the following manner: Water is drawn from the holding tan Y, and pumped to two wash screens, and a belt washing circuit. Water from both wash screens is collected at a common point referred to as the scalping screen. Water from the belt washer is collected in a sump below. The overf.]ow from the scalping screen is comprised of +25 mesh solids and goes to the concentrate pad for transportation to the mill along with ore. The underflow from the scalping screen is comprised of -25 mesh solids and water, and goes to a common collection point where it is combined with water from the belt washer sump. This water and -25 mesh material is pumped to the thickener. The overflow from the thickener goes to the holding tank. The underflow from the thickener (approximately 70°s solids) goes to f.he dry pad. The overflow from the dry pad is pumped to the thickener. The underflow from the dry pad is comprised of settled solids and goes to the concentrate pad for transporta- tion to the mill along with the ore. Upon completion of the two day (48 hour) operational cycle, the water in the holding tank is pumped to the water treatment plant. When the holding tank is emptied, a different value and pump combination is activated and the holding tank receives treated water from the earthan settling pond #3.