Fentress County was the site of several saltpeter mines. Saltpeter is the main ingredient of gunpowder and was obtained by leaching the earth from local caves. The largest mine was in York Cave, near the Wolf River Post Office. At one time, twenty-five large leaching vats were in operation in this cave. According to Barr (1961) this cave was mined during the Civil War. Buffalo Cave near Jamestown was also a major mine with twelve leaching vats. Manson Saltpeter Cave in Big Indian Creek Valley was a smaller operation with four leaching vats. These caves may also have been mined during the War of 1812, as saltpeter mining was widespread in Kentucky and Tennessee during that era.