By the mid-19th century prospectors and geologists had a good idea of what rock types were most likely to host precious metal deposits, and sandstone was not one of them. So when John Kemple reported silver values in sandstone from the Silver Reef area in the late 1860s, his discovery was greeted with disbelief and derision. Even Kemple was unsure of his findings. Not until the mid-1870s did a mining rush get underway, when people finally got around to checking the occurrence firsthand. The silver mineralization is hosted in the…
