The discovery of silver in Texas is credited to the Franciscan friars who discovered and operated mines near El Paso about 1680. These mines were worked for a number of years until the Franciscans, fearing to lose control of them to the Jesuits, concealed them. In July 1793 one mine near El Paso was reopened and worked until Mexican independence in 1821, when its location was again lost. The mine was rediscovered from church records in 1872, and in 1880 the Presidio Mine near Shafter, Presidio County, was discovered. Opened in 1884, this mine produced $300,000 worth of silver annually for a number of years.