930 NEW YORK STATE MUSEUM 



mill equipped with stamps and buddies. In character the deposit 

 resembles the graphitic quartzite of Hague, but it is of larger size 

 and somewhat lower in grade. 



A new undertaking is the Champlain Graphite Co., which was 

 organized late in the year to develop a deposit of graphitic schist 

 near Whitehall. A mill is now under course of construction. The 

 Silver Leaf Graphite Co. of the same place did not engage in pro- 

 ductive operations during the year. 



Some attempts to mine graphite have been made on the opposite 

 side of the Adirondacks in St Lawrence county. Both veins and 

 disseminated deposits occur in association with crystalline schists. 

 Some development work was done last year on a prospect near 

 Pope Mills, town of Macomb. The graphite occurs as fine scales 

 in schist and the deposit is said to be extensive. About 500 tons 

 of rock have been taken out and a mill has recently been completed. 



The production of crystalline graphite from New York mines in 

 1904 was 3,132,927 pounds, valued at $119,509. There was little 

 change in the output compared with previous years. 



The International Acheson Graphite Co. of Niagara Falls re- 

 ported a production of 3,248,000 pounds of artificial graphite, 

 valued at $217,790. 



GYPSUM 



The gypsum quarried in New York is the rock or massive variety. 

 It occurs as interbedded deposits in the shales and limestones of the 

 Salina stage. Seams of selenite, the crystallized variety, some- 

 times accompany the deposits, but they are so limited as to have 

 little economic value. The rock gypsum usually contains clay, 

 carbonates, silica and other impurities, the presence of which 

 in appreciable quantities is injurious to its use for some purposes. 

 Till recently most of the gypsum obtained in the State was ground 

 and sold as land plaster. It has been found, however, that the 

 better quality of rock can be utilized in manufacturing wall plaster, 

 and several companies have engaged in this industry which now 

 consumes the greater part of the quarry output. 



The main gypsum beds outcrop near the southern edge of the 

 area occupied by the Salina strata. The latter have a quite uniform 

 dip to the south. Smaller deposits occurring in the lower horizons 

 of the Salina are not worked. The number of beds in any given 

 locality varies, but usually two at least have been found. In 

 order to facilitate operations, the workings are located near the 

 outcrop of the deposits, where there is the least overburden. No 



