32 NEW YORK STATE MUSEUM 



drilling on the Old Bed have been particularly favorable. The 

 extension of the deposit to the south has been practically established 

 for a distance of several hundred feet beyond the present limits of 

 the workings. With the enormous development shown by the ore 

 body in cross-section, every foot added to its longitudinal extent 

 means an important addition to the ore reserves. 



The construction of a new power plant was begun by Witherbee, 

 Sherman & Co. during 1906. The building is situated on the 

 lake side at Port Henry, and is constructed of concrete made of 

 cement and mill tailings. It will supply 800 kw. A 6 mile trans- 

 mission line will connect the plant with the mines. This increment 

 to the power supply will enable the company to enlarge considerably 

 its mining operations. 



Lyon Mountain. The mines were continuously active during 

 1906 and their output has been larger than for several years past. 

 The increase has been made possible by the erection of a new mill 

 which has doubled the former capacity for concentrating the ore and 

 which was placed in operation for the first time during the summer. 

 Other additions to the plant have been in course of construction, 

 including the installation of a central power station, air compressors, 

 new trackage, and houses for the miners. 



The new mill was designed for the treatment of 1200 tons crude 

 ore a day or 50 tons an hour. The results thus far obtained show 

 that under normal conditions it is capable of a considerable larger 

 output. It also effects an important saving in the item of labor. 

 The concentrates turned out run about 63 per cent iron. In the old 

 mill about 6 per cent of iron was lost in the tailings, while now the 

 latter carry only 4 per cent as an average.^ 



The central power station when completed will have a capacity of 

 3000 h.p. It is to replace the small power plants that are dis- 

 tributed among the different shafts and the old separator. The 

 first third of the station developing 1000 h.p. has been completed 

 and put in operation. It supplies power to the new mill through a 

 500 kw. generator directly connected to a Curtis turbine. In the 

 same room is installed a cross-compound two stage air compressor 

 for furnishing air to the drills. 



As described in the issue of the bulletin for 1905, the mines at 

 Lyon Mountain are very extensive. The ore bodies form a prac- 

 tically continuous belt from 5 to 6 miles long. Mining at present is 



I Consult article by D. H. Newland and N. V. Hansell, in Eng. & Min. Jour., Nov. lo 

 .' ] t 17, 1906. 



