Here is some data based on Internet searches: Green Spring Furnace -In 1770, Governor Johnson and a Mr. Jacques erected a furnace on Green Spring Run, one mile above its entrance into the Potomac River. The neighboring ore not being of good quality, the furnace was abandoned in 1775. Green Springs Furnace road is off 56 Route Big Pool Road and on the south side of I-70 west of Fort Frederick State Park. It may now be known as McCoys Ferry Road and appears to parallel Green Springs Run. Lancelot Jacques House Route 56, Big Spring "Three miles south of Clear Spring, at Green Spring Furnace, is located a log and clapboard house built before 1750 by Lancelot Jacques, a French Huguenot refugee, who came to America and became a great friend of Thomas Johnson, later Governor of Maryland. Together they operated Catoctin Furnace and were partners in many business ventures, not dissolving partnership until 1776. Lancelot Jacques kept the Green Spring property and his nephew, Denton, lived there after him. The house was admirably situated for defence against the Indians, as it was on a hill close to a fine spring. Three miles southwest was Fort Frederick, offering refuge if the attack on the dwelling proved too much for the small group of pioneers to cope with. When Braddock marched to his death he passed near here, camping under Fairview Mountain." Green Spring Furnace ceased operation in 1873. The Green Spring Ore bank appears to be under or along side I-70 on Cove Road about 1200 feet from Green Spring Furnace Road. Don't know if any of this is of value More is out there using the big search engines. Harry