The Highlands of the Hudson — Magnetic Iron Ores. 19 



QUEENSBOROUG-H MINE, Monroe, Orange County. — The 

 mine at Queensborough has been idle for nearly thirty years. It is 

 the property of the Forest of Dean Iron Ore Company. 



KRONKHITE MINE, Highland, Orange Co. — The Kronkhite 

 mine also belongs to the Forest of Dean Iron Ore Company. It is 

 about two miles west of Cranston's-on-the-Hudson. The vein is said 

 to be small; and the mine has been idle for a long time. 



Magnetic iron ore has been mined in small quantities at three or 

 four other localities in the Highlands north of West Point and in 

 the towns of Highland and Cornwall. None of them have been de- 

 veloped into productive mines. 



CORTLANDT MINES, Cortlandt, Westchester County.— Under 

 this head may be grouped several openings on magnetic iron ore in 

 the town of Cortlandt, south and south-east of Peekskill. 



The "mines" near Cruger's station and west of the H. R. R. 

 line are properly trial pits, and the ore found there is either in thin 

 beds or is too lean for profitable working. 



South-east of Peekskill, three to four miles, larger deposits of 

 irregular shape have been opened in surface diggings, made in 

 searches for emery. The magnetite occurs with corundum and in 

 the Courtlandt rocks as described by Prof. Jas. D. Dana.* Accord- 

 ing to analyses, these ores contain from 34 to 35 per cent of metallic 

 iron and 34 to 44 per cent of alumina, and this high percentage of alu- 

 mina has attracted attention to them as a blast furnace flux.f No work 

 has been done at any of these Cortlandt localities in the last ten years. 



TODD MINE, Phillipstown. Putnam County. — This mine is six 

 miles northeast of Peekskill, in the Canopus Hollow. It was 

 opened about thirteen years ago and worked until 1880. 



CROFT MINE, Putnam Valley, Putnam County.— In the same 

 valley (Canopus Hollow) and nine miles from the Hudson river, the 

 Croft Mine is opened in the western hill-side. It was one of the 

 earliest opened mines of Putnam county, and was worked until in 

 1881. A narrow-o-aup-e railroad runs from the mine to the Hudson 

 river. The ore is suited for Bessemer iron. 



*Am. Jour. Science (3) vol. XX., pp. 199-200. 



fDr. Jas. P. Kimball. A "Flux for Rolling- Mill, Cinder and Silicious Iron Ores 

 in the Blast Furnace." Trans. Am. Inst. Min. Eng., vol. IX., pp. 18-19. 



