MINERAL RESOURCES OF THE STATE OF NEW YORK I23 



phosphorus about .6 per cent. At No. 5 adit a quantity of lump 

 ore was mined and left on the ground. The output of the mines 

 was transported by tramway to the turnpike and hauled in wagons 

 to Cold Spring. 



The further continuation of the belt to the southwest has been 

 explored through the Sackett, Pratt and Denny mines in order of 

 occurrence. The Sackett and Pratt lie on opposite sides of the 

 road leading from Dennytown to Canopus creek and each consists 

 mainly of open pits extending along the seam for 300 feet or more. 

 The ore seam measures 5 to 15 feet across, with an additional few 

 feet of leaner material in the walls. As elsewhere pegmatite appears 

 frequently and in places is in contact with the deposit. The ore is 

 identical with that of the Sunk mine. The Denny mine is on the 

 southwest end of the belt, i mile southeast of Dennytown, and the 

 workings indicate a more irregular occurrence than shown at the 

 other mines, for the seam pinches and swells so as to form more or 

 less independent shoots or lenses arranged end to end. Little ore 

 was actually mined. The width of the widest part of the lenses 

 is about 20 feet and the length along the strike about twice as great. 

 The property was held independent of the others and was last worked 

 by the Thomas Iron Co. 



Nelson mine. An occurrence of magnetite at Travis Corners, 

 3 miles east of Garrison on the Hudson, may be considered a pro- 

 longation of the Canada belt, as it lies nearly along the same axis. 

 It is 3^ miles distant from the Denny mine to the southwest. The 

 property was prospected many years ago by the Kingston Iron 

 Ore Co. and in 191 2 was further explored by the Mt Summit Ore 

 Corporation which equipped it with a shaft and small mill. The 

 magnetite occurs in seams interleaved with the country gneiss and 

 to some extent in disseminated condition in the latter; granite has 

 injected the gneiss so as to convert it largely into a mixed rock. 

 The dip at the surface, as indicated by the slope of the shaft is 45° 

 northwest, but becomes nearly vertical at the bottom which had 

 reached a depth of 165 feet in June 19 13. The strike is nearly 

 northeast. The heaviest seam of ore is 4 to 5 feet thick. Difficulties 

 were encountered in concentration by the methods employed which 

 made use of permanent magnets set in vertical series with the 

 crushed ore passing as a thin stream in front; much dust was carried 

 down with the magnetite. Little ore was actually shipped and 

 operations were discontinued in 19 13. • 



Tilly Foster. This mine once held a leading place among the 

 magnetite mines of southeastern New York and contributed about 



