[146] In 1811 "Mill Grove" was conveyed by Francis Dacosta & Company, to Frederick Beates, who in 1813 sold it to Samuel Wetherill, Jr., for $7,000, the property having shrunk to less than one-half the value placed upon it in 1806. For the enterprises of the Wetherills, see Note, Vol. I, p. 102. [147] Since we have been obliged to enter rather minutely into the history of "Mill Grove," in order to trace the relations of the Audubons to it in an important period of the naturalist's career, the reader may be interested in the anticlimax which its famous mines reached at a later day. The Ecton Consolidated Mining Company had been in operation at "Mill Grove" for a considerable period, when, in 1848, the Perkioming Association was formed and ten thousand dollars was at once invested in machinery. In 1851 these two companies were combined under the name of the Perkioming Consolidated Mining Company, which issued 50,000 shares of stock, at six dollars each, thus representing a capital of $300,000. A mining settlement quickly sprang up on Audubon's old farm, where numerous buildings of stone, a general store, and miners' houses were to be seen. In the first annual statement issued by this company, the buildings were said to represent an outlay of $15,000, while $140,000 had been expended on machinery, both above and below ground. A Cornish expert, who was summoned from England, was paid $1,414 for a verbose report, the substance of which, it was said, was expressed in conveying the information, already known, that the "mineral mined is copper ore" (copper pyrite occurring in association with lead). This company closed its business in 1851, by assessing its stockholders one dollar a share, thus bringing the total loss in this final effort to $350,000, nearly one-third of which had been drawn from Philadelphia. After one, or two, further unsuccessful attempts had been made, all the substantial buildings of the mining works became a quarry, from which stone was sold by the perch, the ruins of the old engine house alone remaining to this day as a witness of the follies of the generations that are gone. (This account is based upon reports which have appeared in the press of Philadelphia or in other Pennsylvania newspapers.)