This folder contains correspondence, lists of stockholders, and other documents relating to mining and ore milling. Some of the documents deal with the business of the Edison Ore Milling Co., Ltd. and the Spring Valley Hydraulic Gold Co. Related material can be found in the Edison Ore Milling Co. Minute Book (Company Records Series) and in Letterbook, LM-005 (Letterbook Series).

Approximately 50 percent of the documents have been selected. The following categories of documents have not been selected: routine correspondence regarding ore samples sent to Edison for assaying; routine financial documents; correspondence offering to sell mining properties to Edison; duplicate copies of selected documents.