Starting around the time of the Civil War, the production method for removing the Sulphur from the copper ore mined in the area required building bonfires, throwing in the ore, and burning off the Sulphur. This necessitated cutting most of the trees in the valley for the bonfires. The acid rain caused by the burning of the Sulphur inhibited additional vegetation from growing, and the topsoil consequently washed off the hilly terrain due to lack of vegetation to hold it. Though acid plants were later built to convert the Sulphur into a useful product, the result of the earlier activities was that for years, up until the 1980s, the area was denuded of any greenery, and the red clay soil remaining gave it a Martian appearance. The area has now been greatly reforested, due to a multimillion-dollar effort by the successor companies to the original copper company. The copper and acid plants have been permanently closed and most of the plant infrastructure already removed and sold overseas. Much of the scrap metals from the site have been removed and sold to China. Glenn Springs Holdings has cleaned and purified all the surrounding creeks and waterways, and water quality is now back to near pristine condition according to published EPA and Tennessee Department of Environmental Conservation studies.