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Future subsidence limits are calculated by projecting a maximum <br /> 450 angle from underground mining limits to the ground surface <br /> and are illustrated on the phase maps. <br /> Presently, the majority of underground ore comes from <br /> the Storke Level . The 600 Level , located 300 feet below <br /> Storke, supplies the balance of underground ore . As the Storke <br /> Level ore is gradually exhausted , the 600 Level will supply a <br /> greater proportion until about 1986 when it will be the sole <br /> underground ore producer . The 900 and 1200 Levels are proposed <br /> to come into production during the mid 1990 ' s. Construction to <br /> gain access from the Storke yard area to the 900 and 1200 <br /> levels began in 1980 . The Ceresco Level was mined during the <br /> 1960 ' s and it may be reopened during the mine life . <br /> Most underground equipment is powered by electricity <br /> or compressed air; however , present plans call for an increased <br /> use of diesel-powered rubber-tired equipment. Equipment in- <br /> cludes locomotives, sidedump ore cars, jackleg drills, overcast <br /> loaders, slusher hoists , load-haul-dump units, and mobile, <br /> rubber-tired hydraulic jumbo drills. <br /> Fresh air is heated and pushed by fans into the mine <br /> at No. 7 Shaft and passed through the haulage drifts , up and <br /> through the slusher drifts and exits the mine through a series <br /> P°of ventilation drifts and raises with exhaust fans . The <br /> crusher area vent raise extends from the 600 Level underground <br /> crusher to the surface . <br /> 2.6 CRUSHING AND MILLING <br /> Crushing and milling facilities are located at the <br /> main Climax site ( 5) , the Storke Level ( 5) and underground. <br /> Primary crushers are situated on the surface at the main Climax <br /> site and primary gyratory crushers are located on the surface <br /> at Storke Level and underground on the 600 Level . New crushing <br /> facilities such as the No. 6 Crusher which will service Open <br /> Pit ore, will come into production in the future . Secondary <br /> crushing is by standard cone crushers . Tertiary crushing is by <br /> shorthead cone crushers. All fine ore is conveyed to the mill <br /> 2-8 <br />