56 Bulletin of the New York State Museum. 



DEUEL HOLLOW MINE, Dover, Dutchess County. — This 

 locality, two miles south-east of the South Dover station, ceased to 

 be a productive mine many years ago. 



DOVER MINE, Dover, Dutchess County. — This old mine was 

 described by Prof. Mather, under the name of "Foss Ore Bed."* It 

 has been worked at intervals — the last time in the spring of 1888. 

 The ore was used at Dover Furnace, and subsequently at the furnace 

 near the mine. A narrow gauge railway connects the mine and the 

 Dover Furnace station on the New York and Harlem railroad. The 

 furnace was burned in 1883. The ore occurs under a rather thick 

 covering of glacial drift, and between strata of garnetiferous mica 

 schist, which forms the mass of the rocky ridge on the east and the 

 mountain on the west. The ore was won by underground workings. 

 The place has been known as the " White Ore Bed/' in later years. 



SQUABBLE HOLE MINE, Amenia, Dutchess County.— This 

 mine is one and a half miles south-west of Amenia and half a mile 

 west of the Harlem railroad and near the Chestnut Eiclge. It was 

 opened in 1865, but has not been in operation for the last ten years. 

 The locality is noteworthy for the occurrence of a carbonate of iron 

 ore, associated with the brown hematite. The Manhattan Iron 

 Works of New York city owns the property. 



GXRIDLEY MINE, Amenia, Dutchess County. — What is known 

 as the Gridley pit adjoins on the south the old and celebrated 

 Amenia mine, west of the village of Amenia. They are practically 

 one, being separated by a property line only. No work has been 

 done in the last five years, or since the death of N. Gridley & Son, 

 its owners, to whose estate it now belongs. A notable fact is the 

 amount of carbonate of iron, or, as it is known by the miners, 

 "white horse." It has a grayish- white color on fresh and 

 unweathered surfaces, and occurs in the limonite. A considerable 

 quantity of this ore was mined near the south end of the mine and 

 smelted in the Gridleys' furnace at Wassaic. It made an iron of 

 unusual tensile strength — 39.669 to 47.500 pounds per square inch. f 



AMENIA MINE, Amenia, Dutchess County. — The Amenia 

 Mining Company owns and works the mine adjoining the Gridley pit 



* Geology of the First Geological District, by Wm. W. Mather, Albany, 1843, p. 493. 

 f For analyses of the roasted ore and of pig-iron and tests of strength, see papers 

 of Edward Gridley in Trans. Am. Inst. Min. Bug., Vol. XII., pp. 91, 92 and 520. 



