^2 NEW YORK STATE MUSEUM 



and have the appearance of veins. The Hmestone contains serpen- 

 tine nodules that have been derived by alteration from a nonhydrous 

 silicate probably pyroxene. The mineralization is no doubt due to 

 underground circulations. These have found passage along the 

 contact between the gneiss and limestone and to a lesser extent 

 along fissures within the limestone. It may be noted that the exten- 

 sive talc deposits of this section occur on the same limestone belt 

 and in the immediate vicinity of the zinc ore bodies. As has been 

 demonstrated by Prof, C. H. Smyth jr, the talc owes its origin to 

 the influence of subterranean waters acting upon masses of tremo- 

 lite and pyroxene in the limestone. The evidence is insufficient to 

 justify at present anything as to the precise manner in which the 

 zinc blende has been deposited. 



Some work was done during the year on a deposit of galena situ- 

 ated near Pierces Corners, St Lawrence co. The property was 

 worked several years ago, but was abandoned after a little explo- 

 ration. The former shaft which was bottomed at 80 feet has been 

 pumped out and will be deepened at least 100 feet additional. The 

 work is being done by the Independent Lead Co., of New York city. 



The lead mine near Otisville, Orange co., formerly owned by the 

 Washington Mining Co., has been taken over by the Phoenix Lead 

 Co. of Paterson, N. J. It was developed to some extent last year, 

 and it is proposed to instal machinery for continuing the work during 

 the present season. 



