Henry Burrell was a Sand Coulee and Carbonado, Montana, coal mine investor and owner. He was also affiliated with the American Developing and Mining Company of Marysville and Butte. This collection (1890-1905; undated) includes correspondence, legal documents, mine reports, maps, financial materials, and a portrait of Henry Burrell.

The James Fergus Family papers are divided into four subgroups: James Fergus; Andrew Fergus; Fergus Live Stock and Land Company; and miscellaneous. Papers (1857-1971) include biographical materials, incoming correspondence, outgoing correspondence, general correspondence, financial records, legal documents, subject files, and miscellany.

Alexander McKay (1832-1922), a Scottish immigrant, was a miner and businessman in Virginia City, Montana. Records (1857-1922) include correspondence, financial records, legal documents, and court papers for McKay's business interests including flour mills and mining claims. There are subgroups for Elling, Baker McKay (1887-1911); Mill Creek Mills (1878-1898); Caroline Hanson McKay (1877-1911); and Mary McKay Herhold Bothwell Swanze (1876-1925).