84 NEW YORK STATE MUSEUM 



on the Adirondack division of the Delaware and Hudson Railroad 

 within the North Creek quadrangle. The exact location is shown by 

 the crossed hammers on the geological map of the North Creek 

 sheet. 1 The mine is situated on the southern slope of a low hill. 



The Rowland property, in fee and lease, covers over 200 acres in 

 the valley of Mill creek. 2 



Beck, 3 in 1842, wrote: " In Warren county, graphite will probably 

 be found in considerable abundance. There is a locality of it on the 

 farm of Mr Noble, at Johnsburg. Several hundred weight of good 

 graphite has been obtained from this mine. The mineral occurs 

 in irregular shaped masses weighing from one to twenty pounds, in 

 a vein of quartz." 



Active development of the property took place prior to 1899. 

 In 1900 operations began and working continued as late as June 

 1 910, but today the mine is idle. There seems to be no prospect of 

 reopening the mine. 



Workings. " The principal opening consists of an open cut 

 running westerly [N J 2° E, magnetic] . . . about 100 feet long 

 and 30 feet deep at the west end, where a shaft in the deep west 

 end of the cut penetrates the bed of graphite schist to a depth of 

 22 feet below the present bottom of the cut, and a short drift 

 running southward from the shaft on the richest part of the bed." 4 



Geology. The immediate area has been mapped by W. J. Miller 

 as composed of Grenville crystalline limestone interbedded with 

 horneblende and horneblende-garnet gneisses, which strike N J0° E 

 and dip 20 to 35 ° to the south. 



The ore bed is in all probability the Dixon schist, some 28 feet 

 in thickness, the upper portion of which is decidedly micaceous and 

 lean in graphite while the center is exceedingly rich due to igneous 

 redistribution and reorganization, as will be shown later. Asso- 

 ciated with the ore is a limestone (the Faxon), in part interbedded 

 with it and in part beneath, specimens of which may be obtained 

 from the material removed from the entrance of the trench. Above 

 the ore is a quartzite, just what the reader may expect, the Swede 

 Pond formation ; on top of this is a horneblende-biotite rock that 

 occurs as an isolated patch in the field to the southwest of the mill. 



Beneath the ore is another quartzite, about 50 feet thick, which 

 the writer regards as equivalent to the Hague gneiss. This is void 



1 Miller, W. J., N. Y. State Mus. Bui. 170. 



2 Information kindly furnished by Mr Charles T. Rowland. 



3 Beck, Nat. Hist, of N. Y. State, pt. 3 Mineralogy, 1842, p. 421. 



4 Crosby, W. O., Special report on the property. 



