These records cover the period 1885-1924, but most of the documents date from the period 1891-1896. Included are correspondence, annual reports, and other documents relating to the organization and management of the company. The documents deal mainly with routine legal, financial, and tax matters. The correspondence pertains primarily to tax obligations, meeting announcements, capital calls, leasing arrangements, royalties, personnel matters, and the transmittal of documents. A few letters concern the employment of a watchman for the Putnam County ore lands. Also included is a letter to Charles Batchelor (1892) in which Edison discusses bricking technology and the cost of cement. Other letters relate to the license arrangements with Edison and the Edison Ore Milling Co., Ltd., and leases and agreements with Edison and the Philadelphia & Reading Railroad Co. The correspondents include Charles Edison; Charles Batchelor, general manager; Thomas Butler, secretary; Alexander Elliott, Jr., and Sherburne B. Eaton, attorneys; and George W. Perkins, secretary of the Interstate Park Commission. There is also correspondence with officers of the Philadelphia & Reading Railroad Co. and the Reading Iron Co. for which related material can be found in the company's legal records.

In addition to the correspondence, there are annual reports for 1891 and 1892 containing statements of the company's capital stock, paid-in capital, assets, debts, and stockholders. There are also letters, maps, photographs, and other documents from 1923-1924 concerning the sale of property on Dunderberg Mountain in New York, as well as stock proxies and other routine business records.

Approximately 50 percent of the documents have been selected.