The Thomas Edison mine, as the name implies, was developed by the famous inventor and entrepreneur Thomas Edison. While Edison is better known for inventions such as the first practical light bulb, he was also very involved in the mining industry. Edison pioneered new geophysical techniques, mineral extraction technologies, and developed the battery powered miners’ head lamp. He was instrumental in the discovery of nickel at Falconbridge, Ontario and also had interests in iron ore in New Jersey, and gold in New Mexico. Edison was heavily involved with the original Cobalt, Ontario silver rush, however it was not the silver he was after. At the turn of the 20th century, Edison was developing a new cobalt-Iron battery (US patent No. US678722A). Similar to today, Edison had difficulty sourcing sufficient supplies of cobalt. In order to keep the price down, Edison sent undercover representatives to Cobalt, Ontario to buy cobalt bearing minerals, which were produced as a by-products from silver mining in the area, for his battery manufacturing facility in New Jersey. He also used these representatives to attempt to buy high-grade cobalt silver mines and prospects. Eventually Edison acquired the Darby property (now the Thomas Edison Mine) in 1905. From 1905 to 1907 Edison remotely directed operations at the mine which included sinking two shafts to 150 feet, which were connected by an adit, as well as several exploration drifts and crosscuts. Between 6 and 8 tons of ore of unknown grade are reported to have been extracted, but no commercial production is recorded.