MINERAL RESOURCES OF THE STATE OF NEW YORK II3 



mora mines based on long bands which as a maximimi are about 

 30 feet thick. 



Lyon mountain. The ore bodies now mined represent the middle 

 section of a belt some 5 miles long extending along the lower slopes 

 of a ridge of which Lyon mountain is the culmination. The trend 

 in general is northeast-southwest. On the southwest end is Mine 

 81, 2 miles from the main group, opened for about 1000 feet 

 along an ore band that averages 18 feet wide and is nearly- 

 vertical. It has been idle since 1902. The ore is higher in phos- 

 phorus than the present product, but affords good Bessemer 

 concentrates. In the main group which lies directly on the flank 

 of Lyon mountain three more or less well-defined seams are shown 

 in outcrop or by mining development, occupying a zone about 200 

 feet across. The front or main deposit is the chief dependence in 

 mining and has been opened for a distance of 2500 feet on the strike 

 and explored still farther by test pits. Its strike throughout most 

 of its course is N. 20° E. but in the southwest section, near shaft 5, 

 the course swings around in a broad curve to nearly west, and the 

 ore body shows a notable thickening as well as flattening of the dip 

 so that much ore has been removed by open cut operations. Else- 

 where the dip ranges from 45° to 60°, steepening toward the north- 

 east, and the ore measures about 20 feet from wall to wall. Under- 

 ground work in the past has been carried on through a large number 

 of inclined shafts or slopes, some of them poorly planned for 

 permanent work; a new central shaft has been put down lately, 

 of ample capacity to replace the mmierous small ones previously 

 employed, and a systematic method of development has been laid 

 out. A large modem mill is also in course of construction. On the 

 northeast end of the ore belt, 2 miles away, is the Parkhurst shaft, 

 now inoperative. 



The ore occurrence is very similar to that described for the deposits 

 near Ausable Forks. The country rock is gneiss composed of 

 feldspar, quartz and minor amounts of diopside and hornblende, 

 with pegmatitic and aplitic phases, a slightly foliated granite or 

 acid syenite in field appearance. It carries considerable magnetite 

 in disseminated condition, often showing schlieren quite as rich as 

 much of the ore itself. The latter shows a wide range in regard to 

 iron content, but the mine average is aroimd 30 per cent. In the 

 first operations considerable quantities were shipped in lump form 

 but now all the product is sent to the mill. 



The Lyon Mountain mines belong to the Chateaugay Ore & 

 Iron Co. which took over the property in 1903. Since 1871 when the 

 first regular operations began it supplied about 5,000,000 tons of 



