[Frederic Shonnard & W.W. Spooner (1900)] The minerals found in the county, in greater or lesser quantities, embrace magnetic iron ore, iron and copper pyrites, green malachite, sulphuret of zinc, galena and other lead ores, native silver", serpen-tine, garnet, beryl, apatite, tremolite, white pyroxene, chlorite, black tourmaline, Sillimanite, monazite, Brucite, epidote, and sphene. But Westchester has never been in any sense a seat of the mining industry proper, as distinguished from the quarrying. In early times a silver 1(5 HISTORY OF WESTCHESTER COUNTY.nine was operated at Sing Sing, very near where the prison now stands and not far from the same Locality an attempt was made some seventy years ago to mine for copper. Both of these mining ventures are of mere curious historical interest, representing no actual success-fu] production of a definite character. In the ridges along the north-ern borders of the county considerable deposits of iron ore are found. It is stated bv Mr. Charles E. Culver, in his History of Somers, that the irou ores "of that town have, upon assay, -yielded as high as (31 per cent." Teat swamps, affording a fuel of good quality, exist in several parts of the county, notably the Town of Bedford. There are various mineral springs, as well as other springs, yielding water of singularly pure quality, The latter being utilized in some cases with commercial profit. A well-known mineral spring, for whoso waters medicinal virtues are claimed, is the Chappaqua Spring, three miles east of Sing Sing.