2019-11-27_PERMIT FILE - M2019058 (10)

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D-28 The clarifier unit will receive all plant effluent; solids will be settled out (polymers may be employed to facilitate the settling process),and the resultant clarified water re-introduced(recycled)to the wash process. Belt filter presses will be utilized to reduce the water content of the clarifier underflow, with the liquid effluent reporting back to the clarifier. The resultant filter cake will be temporary stockpiled by radial stacker and removed, as space constraints may dictate,to the reject(process waste)stockpile. The wet sand,the intermediate silica product,will be conveyed to the Wet Sand Storage Building where it will be stockpiled by tripper conveyor and allowed to passively decant(through drain-down processes)the residual water content. Drain-down fluids will be collected via an underdrain system and returned to the water clarifier unit. The post drain-down intermediate product will then be routed to a drying plant, where it will be passed through gas-fired rotary dryer unit(s), after which all material will report to a 1/16" scalping screen to remove any foreign material from the product that may have been introduced during the transfer and/or drying processes. The reject will be stockpiled(minor quantities)under individual scalping screens,until moved to pit as part of back fill process. Each gas fired rotary dryer will have a cyclone and bag house to remove fines material(particulate) from the air flow stream;this fines"reject"will be conveyed to a small"reject"stockpile,where it will remain until space constraints dictate their removal to the process waste stockpile. The desired #30/140 end (saleable)product emanating from the gas-fired rotary dryer and scalping screen circuit will be conveyed to the Dry Sand Storage Building where tripper conveyors will again be utilized to stockpile the product. Product from Dry Sand Storage Building will be removed by reclaim gates and conveyed to the product load-out silos. Product load-out silos will be positioned above scales and will function as "surge bins"to facilitate truck loading(to third-party over-the-road tractor-trailer units),utilizing a telescoping spout with integrated dust control. Plant Operating Schedule The Keenesburg Project plant and loadout operations are anticipated to operate on a 24-hour basis, seven days per week. Two 12-hour shifts per day are planned; and, an estimated nineteen (19) persons are anticipated for each shift(for a total of 38). The breakdown of the onsite personnel is anticipated to be two shift rosters of six(6)management personnel each shift,and two shift rosters of thirteen(13)laborers each Keenesburg No. 2 Mine_112 Reclamation Operation—November 22, 2019