1997-09-10_REVISION - M1977247 (6)

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Section 2500 42000 tons Section 2600 40000 tons Section 2700 38000 tons Section 2800 32000 tons Section 2900 30000 tons Section 3000 30000 tons Section 3100 24000 tons Total tonnage, Copper Hill highwall 337000 tons While this area will demand the most volume moved and cost by far, the cost per ton moved should be less due to the fact that most tonnage will be blasted directly into the pit below foregoing any further bulldozer work and the fact that long drill holes (the tamrock production drill is capable of 84' holes) should allow for low cost blasting per ton shot. NORTHEAST EDGE OF HANGINGWALL CONTACT Mine development work left a highwall contact along the entire length of the ore deposit from the crusher site all the way to the extreme North end of the deposit, anywhere from 50 to 150 feet from the actual ore/waste material contact (hangingwall proper). This highwall ranges from 20 to 50 feet in height and is composed of the fractured hangingwall limestone which should be fractured enough to be bulldozed in most places, although some of this material may have to be blasted. A rough estimate of 25% drill and blast will be used on these volumes with the remaining 75% assumed to be moved with the bulldozer. The first several sections listed below includes the highwall removal on the east side of the main haul road just above the crusher site and the volumes necessary to reshape the crusher site retaining wall and stationary equipment area after the primary crusher, rock bin, dust collector,sample system, screen deck, and conveyors are removed. Section 500 4200 tons Section 600 4600 tons Section 700 4000 tons Section 800 3600 tons Section 900 4400 tons Section 1000 4000 tons Section 1100 4800 tons Section 1200 5000 tons Section 1300 3000 tons Section 1400 4000 tons Section 1500 4200 tons Section 1600 3500 tons Section 1700 3600 tons