This folder contains correspondence and other documents relating to mines and ores to be bought, sold, worked, or tested. Some of the items deal with the mining interests of individuals and companies who wanted to lease or sell property to Edison or to have their ores tested. Most of the selected items received a significant reply by Edison.

Approximately 10 percent of the documents have been selected. Some of the unselected letters contain marginal notes by Edison requesting samples of ores, indicating that he would send a surveyor to the property, or giving notice that a survey showed the mine to be unsuitable. A few unselected letters concerning southern mines received a response that Edison might be traveling to that region later in the year and that he would communicate further.