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1 <br /> of 1.0, 400 feet. In plan, the deposit is at a maximum 3/4 of a <br /> mile in diameter. <br /> Because of the stacked orebodies, the variable time of <br /> emplacement of mineralization and the extreme variation in topo- <br /> graphy, the character and thickness of overburden is highly <br /> variable. Overburden ranges from minor soil cover to large <br /> amounts of glacial till to all rock types from precambrian schist <br /> through tertiary. intrusive rocks. The thickness varies from zero <br /> to several hundred feet. <br /> 2. 3 OPEN PIT <br /> Open Pit mining operations will remain through the end <br /> of the known open pit ore reserves. Estimated ore tonnage of the <br /> • Open Pit (1) is 2.08 million tons with an ore grade of approximately <br /> . 302 percent MoS2 . Strip tonnage is approximately 380 million <br /> tons for an overall strip ratio of 1. 83 to 1. The ultimate <br /> acreage to be affected within the bounds of the Open Pit is 405 <br /> acres. <br /> The Climax Open Pit is designed as a modified slice <br /> system. The typical. slice system consists of mining ore and <br /> waste increments more or less parallel to the final pit walls <br /> until final limits are reached. Each subsequent mining increment <br /> will leave behind a bench that is less than 40 feet in width <br /> depending upon the stability of the particular geologic material. <br /> Criteria used for slope design of the Open Pit is 45 degrees for <br /> stable rock and 32 degrees elsewhere. Because of access problems <br /> 2-5 <br />