Summary and Discussion     The system will be a friction hoist to a depth of 1,200 feet, operating on an AC motor with a 78 second cycle.  There will be two twelve-ton skips supported by four flattened-strand ropes of 1-3/8" diameter.  The drums will be ten feet in diameter, and the system will have a peak horsepower requirement of 2,325 hp.     In several cases throughout the calculations, values were rounded up to meet standard sizes available within the industry (in particular, the skip and payload weights, and the rope thickness and drum diameters).  Due to this rounding, later values, especially horsepower, will be slightly exaggerated over the actual requirement.  Given that there is to be a factor of safety of at least 7.0 (in this case, 8.0), these inflated values serve to raise the F.S. without being disproportionately large.