594 MmmG industey. 



From this work were produced^ 98 tons of ore that yielded $560, coin, per 

 ton; 29 tons shipped, or ready for shipment, to Newark, having an average 

 assay value of $642, coin, per ton, but from which the returns of actual yield 

 had not been received ; 68 tons of second-class ore, of which 48 tons, worked, 

 yielded $210, coin, per ton; besides which, it is said, there are from 1,200 to 

 1,600 tons of third-class ore on hand, consisting of inferior quality of vein- 

 matter mixed with small particles of rich ore, broken in the mine and on the 

 assorting floor, the whole of which is estimated to contain, by assay, $80 to 

 $100 per ton. This material must be concentrated before treatment. 



This mine was discovered in the winter of 1866-'67, and has been devel- 

 oped gradually by a small force on a careful and economical basis. The ori- 

 ginal outlay of capital is said to have been small, and the profits of the work 

 considerable, but the writer has no direct information on that point. The 

 costs of mining cannot be very closely estimated from the available data. 

 Sinking costs $40, currency, per foot; drifting, $20 per foot; stoping, $40 per 

 fathom. The mine is provided, at the mouth of the shaft, with a small engine 

 for hoisting and pumping. The pump is small and the water abundant, and, 

 for this reason, the work, in the lower part of the mine, was suspended during 

 the summer of 1869, awaiting the completion of a tunnel, then being driven 

 in from the hill-side. The steep slope of the hill affords great advantages for 

 attacking the lode by tunnels, and this is now being done. An adit, about 

 350 feet long, strikes the vein at a depth of 260 feet, dispensing with the 

 necessity, for some time to come, of raising either rock or water. The out- 

 crop of the vein being several hundred or a thousand feet above the valley, it 

 may be worked by this means to a very considerable depth. 



The tunnel referred to is 6 i feet wide by 7 J feet high. It passes through 

 very hard granite. It is driven with the aid of the Burleigh drill, which gives 

 great satisfaction, performing its work at half the cost of hand labor, according 

 to the estimate of the owners of the mine. The whole working cost of driv- 

 ing this tunnel had been, at the time referred to, about $40 per foot. Several 

 other tunnels are being driven in this district, some of which employ the Bur- 

 leigh drill, and will be noticed further on. The following are a few notes 



^ According to statement furnislied by Mr. F. A. Clark, one of the owners and 

 manager of tlie mine. 



