58 Bulletin of the New York State Museum. 



York and Harlem railroad. The first opening for ore was made 

 about 1780. The ore body is in a grayish-blue limestone belt, and 

 strata of this rock crop out in the north-west and in the south-east 

 sides of the great pit, having a dip of 40° to 50° toward the south- 

 east. The stripping consists of glacial drift and bluish-colored clays, 

 and some calcareous marl and muck in places, and it varies from 10 

 to 14 feet in thickness. At the north-east, a blue clay separates the 

 workable ore into two bodies, whose trend is to the north-east. The 

 later workings were by underground drifts. The open pit is at least 

 500 feet in diameter and 160 feet deep. A large amount of ore has 

 been taken out of it, and in 1880 its production exceeded that of any 

 other brown hematite mine in this district. The ore was smelted at 

 the Manhattan Iron Works, New York city. In August, 1888, 

 work was stopped, and subsequently the machinery was removed 

 and the mine abandoned. The ore, according to reported analyses, 

 is low T in phosphorus, and answers for Bessemer pig-iron. The mine 

 is the property of the Sharon Bessemer Ore and Iron Co., of 69 

 Wall street, New York city. 



MALTBY MINE, town of Northeast, Dutchess County. — The 

 Maltby mine is at the south-west foot of Bird Hill, one and one-half 

 miles north-east of Millertou, and within a quarter of a mile of the 

 Connecticut line. It was opened in 1750, and has produced a large 

 amount of ore; and much of it was smelted in a furnace on the prop- 

 erty. The body of ore appears to lie between the slaty rocks on the 

 north and the white, crystalline limestone at the south. No mining 

 has been done here in the last four years. C. S. Maltby, of New 

 Haven, Conn., is the owner. 



DAKIN MINE, Northeast, Dutchess County. — The open pits 

 known as the Dakin mine, are near the Riga station of the N. Y. and 

 Harlem railroad. For several years it has been idle. 



MT. RIGA. MINE, Northeast, Dutchess County.— The Riga mine 

 consists of a large open pit and some underground shafts and 

 tunnels, about half a mile south-east of Mt. Riga station and near 

 the foot of the Mt. Rio;a ridsre. A branch railway connects the mine 

 with the N. Y. and Harlem railroad. The plant is in fairly good order, 

 although no ore has been raised since February, 1885. A pile of sev- 

 eral thousands of tons is being shipped to furnaces in this region. 

 The Mt. Riga Iron and Mining Co., of 15 Park Row, N. Y. city, owns 

 the mine. 



