This quarry was located "near both Tenants Harbor and Long Cove, in the township of St. George, about 13 miles southwest of Rockland." The operator was Booth Bros. & Hurricane Isle Granite co., 208 Broadway, New York. Granite from the quarry was reportedly a medium-gray color with a fine to medium texture similar to the granite found at the Clark Island Quarry. Transport of the granite was by inclined track 900 feet to the wharf.
The Long Cove Quarry was opened about 1873. In 1905 the quarry measured about 1,000 feet north to south by 500 feet east to west and had a depth from 20 to 75 feet, averaging about 40 feet in depth. "This is the only quarry in New England in which tunneling is resorted to in the use of explosives."
Granite from the Long Cove Quarry was used mainly for monuments and was sent mainly to Greenwood and other cemeteries near Brooklyn, New York. Paving blocks were also made. Granite was from this quarry was used in the following examples: the post office in Albany, New York; the Bates Building in Philadelphia; and part of the Saratoga monument.