EXAMPLES OF STEEL HEAD FRAMES. 



347 



Steel Head Frame for the Diamond Mine. The details of the steel head frame of the 

 mini are shown in Fig. 9. The Diamond head frame is 100 ft. high from the collar 

 <>(' (lu- shaft to the center of the sheaves. The shaft is 2,800 ft. deep. The sheaves are 10 ft. 

 in ili.imrUT and carry a 7 in. X i in. flat rope. The ore is hoisted in self-dumping skips with a 

 capacity of 7 tons and weighing 3$ tons, and is dumped into hoppers from which it is run directly 

 into cars which pass beneath the head frame. The main front columns and back braces are 



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FIG. 9. STEEL HEAD FRAME FOR DIAMOND MINE, Bun/r BY THE GILLETTE-HERZOG MFG. Co. 



made of built-up sections consisting of one cover plate 20 in. X ^t in., two plates 1 8 in. X A in., 

 4 angles 3$ in. X 3$ in. X i in., with lacing bars on the inner side 4 in. X I in. The main diagonal 

 bracing is made of two channels laced. The total weight of the structural steel in the head frame 

 proper was 292,000 lb., while the steel work in the bins weighed 26,000 Ib. At 40 cts. per hour 

 the cost of shop labor on the structural steel was 1.09 cts. per lb. The cost of erection, everything 

 being riveted, was $11.20 per ton. 



Steel Head Frame for the New Leonard Mine. The steel head frame shown in Fig. 10 was 

 built by the American Bridge Company for the New Leonard mine of the Boston & Montana 

 Copper Company, Butte, Montana. The head frame is of the A-type, and is 140 ft. high from 



