This collection contains incoming, interoffice and outgoing correspondence, employment records, financial records, legal documents, miscellany, and printed materials, documenting the operation of the Drumlummon Mine, as well as a number of smaller mining properties owned by the Montana Mining Company, Ltd. and located in Arizona. The bulk of the collection is dominated by Incoming Correspondence (1893-1904) from suppliers. More significant is the Interoffice Correspondence (1893-1905), from the home office in London to operators in Marysville, which includes correspondence from mine engineers R.T. Bayliss, H.C. Cutler, J.H. Hall, J.W. Morris, and C.A. Wolsoly. The Financial Records include extensive production reports and balance sheets(1893-1905), bank transactions(1897-1902), and a scattering of invoices and equipment orders(1893-1904). There is a very small amount of Employment Records(1893-1902) (including contracts, payroll, and inquests)and Legal Documents (primarily items related to the litigation with St. Louis Mining and Milling Co). The Printed Materials in the collection document the mining and milling technology in use in the Montana silver industry between 1893 and 1905. These materials are primarily of an illustrative nature. For other collections related directly to the Montana Mining Co. Ltd., see the Thomas Cruse Papers, MC 36 and SC 1028.