REPORT OF THE DIRECTOR I916 2/5 



Point), in gneiss; Warwick, Orange county, in limestone; Tilly 

 Foster mine, near Brewster, Putnam county, in serpentine ; North 

 Russel, St Lawrence county, gneiss-limestone contact. To this list 

 may be added a locality in the town of New Bremen, Lewis county, 

 reported to the writer by A. F. Buddington ; and one north of 

 Peekskill, in Phillipstown, Putnam county, discovered by the writer 

 a few years ago. 



Of the above occurrences the one in New York City is no longer 

 accessible. From what has been learned indirectly, it is evident that 

 the West Point, Constitution island, and Warwick occurrences have 

 little or no interest except purely from a collector's standpoint. 

 At the Tilly Foster mine molybdenite occurs sparingly as a contact 

 mineral in the metamorphosed limestone and is no longer to be 

 found except in the waste dumps of the old workings. 



The Russel locality, about which little has been made known, was 

 visited during the past summer by A. F. Buddington who contributes 

 the following account of it. The mineral is found in association 

 with a green pyroxene rock, or coccolite, that has been prospected 

 in several places, but rather for copper than molybdenite, according 

 to local accounts. There are few indications of copper, although 

 the rock carries considerable pyrite in thin, lenticular bands. Molyb- 

 denite occurs in disseminated flakes and aggregates of flakes, some 

 of which attain a size of an inch or so in diameter and an eighth of 

 an inch thick, but mostly much smaller. The mineral seems to be 

 rather sporadic, and at best too sparsely represented to warrant its 

 mining. The occurrence apparently belongs to the contact type, as 

 the pyroxene wall rock is the result of alteration of limestone and 

 is included in a mass of granite gneiss which undoubtedly has pro- 

 duced the change and introduced the metal. The wall rock is 

 traversed by veins of a coarser pyroxene-phlogopite material which 

 seems to be free of molybdenite. The property on which the pros- 

 pecting has been done lies just south of Boyd pond, near Russel. It 

 is owned by Martin Leary. 



The occurrence in the town of New Bremen, Lewis county, 

 belongs to a different type in that the sulphide is distributed 

 through the mass of a granite intrusion, or rather within indefinitely 

 bordered veins of pegmatite that are found in the granite. The 

 granite has a gneissic appearance and weathers to a reddish color, 

 but is green and pink on fresh surfaces. It may represent a phase 

 of the green syenite found to the northwest of the locality. This 

 occurrence is on the farm of William J. Aucter, three-quarters of 



