THE MINING 



AND OUARRY INDUSTRY 



157 



operated three mills* one mill having burned down in 1905. The 

 capacity of the plants is such that the output could be easily enlarged 

 to much greater than the present proportions. 



Bibliography 



Brinsmade, Robert E. Talc in Northern New York. The Engineering and 



Mining Journal, Dec. 23, igo5, p. 1155. 

 Smyth, C. H. jr. Report on 'the Geology of Four Townships in St Lawrence 



and Jefferson counties. N. Y. State Mus. 47th An. Rep't. 1894. 



ZINC AND LEAD 



The zinc-lead mine at Ellenville, Ulster co., was not operated 

 during 1905. The property came into the possession of the Backus 

 Lumber Co. of Newark, N. J., in 1901 and exploration was carried 

 on for some time, but the results have not been sufficiently encour- 

 aging to warrant active developments. 



Tiie Ellenville mine was first operated about 50 years ago, since 

 which time it has been worked intermittently by different companies. 

 It is a noted locality for beautiful quartz crystals. The deposit 

 consists of a fissure vein intersecting the country rock, the Shawan- 

 gunk grit. The width of the vein averages about 6 feet. Quartz 

 is the principal gangue mineral, while the ore consists of sphalerite, 

 galena and chalcopyrite in varying proportions. Silver is present 

 in the galena to the extent of a few ounces to the ton. The work- 

 ings comprise an inclined shaft that has been carried down to about 

 200 feet on the vein and a series of levels 30 feet apart. A mill for 

 treating the ore has been erected near the mine. 



Zinc ore occurs at several localities in St Lawrence county. Some 

 of the deposits have been known for many years, but they have 

 received very little attention and have not been worked on a com- 

 mercial scale. The ore is generally an intimate mixture of the sul- 

 fids of iron, lead and zinc, presenting a rather difficult problem in 

 concentration under the methods formerly used. With the present 

 improved processes there is no doubt that the minerals can be sepa- 

 rated so as to yield marketable products. 



The most promising deposit that has been found in this section 

 is near the village of Edwards, 20 miles east of Gouverneur. It 

 was discovered about three years ago. The ore body outcrops on 

 the Todd and Brown farms, | mile northeast of Edwards, on the 

 road leading to Trout lake. 



The geologic formations comprise crystalline limestone and horn- 

 blendic gneiss, the former occurring as a narrow belt extending for 

 several miles in a northeasterly direction through the towns of 



