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The rod mill discharge will flow by gravity through a trammel screen. The screen will <br />allow removal of broken rod pieces which will be collected for appropriate disposal. <br />After screening, the rod mill discharge will be directed to the hydrocyclones for sizing. <br />Prior to entering the hydrocyclones, the rod mill discharge will be combined with the ball <br />mill discharge. At this point, the ground ore will enter a continuous loop of sizing in the <br />hydrocyclones and further grinding in the ball mill until the material reaches the <br />appropriate size for the flotation circuit. The hydrocyclones will separate the ore <br />particles based on their size. The shape of the hydrocyclones will cause coarser particles <br />to flow out the bottom (known as underflow) and the finer particles, sized to less than <br />150 microns, to flow out the top (known as overflow). The finer particles will be suitable <br />for flotation and will flow by gravity to the flotation feed conditioner tank. The coarser <br />particles will require further size reduction in the ball mill. <br />From the hydrocyclone underflow, the oversize ore material will be sent to the ball mill. <br />The ball mill is similar to the rod mill except that instead of steel rods, the cylindrical <br />drum contains two inch diameter steel balls. As the ball mill rotates, the balls will tumble <br />with the ore and break it into finer particles. Discharge from the ball mill will go to the <br />hydrocyclones for sizing and this cycle will continue until the ore is fine enough to exit <br />the hydrocyclones through the overflow and proceed to the flotation circuit. This <br />continuous loop will carry a circulating load of 250% which means that for every new ton <br />introduced into the ball mill there will be 2.5 tons of ore being returned from the <br />hydrocyclones for additional grinding. <br />The grinding circuit will include an option to direct the oversize material through a <br />gravity separator system to collect any free gold prior to entering the ball mill. When the <br />gravity separator system is on -line, approximately 50% of the underflow will be sent <br />through it. The oversize ore will first be screened since the gravity separator system can <br />only accept ore particles of a certain size. Ground ore that is too large will be sent <br />directly to the ball mill while the smaller particles will be sent to the gravity separator <br />before entering the ball mill. The gravity separator system will consist of a centrifugal <br />concentrator that separates heavy (gold) particles from the lighter particles in the slurry. <br />The captured heavy particle concentrate containing free gold will be collected and <br />transported by truck to the AGADR for further processing. The lighter particles from <br />gravity separator system will be recycled back into the ball mill for further size reduction. <br />Cripple Creek & Victor Gold Mining Company <br />Cresson Project Mine Life Extension 2 <br />6 -4 <br />