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Winthrop Iron Company records

 Collection — Box: 09-05-03
Identifier: MSS-348

Scope and Contents

This collection consists of business correspondence of the Winthrop Iron Company. This correspondence is in the form of letters and Western Union telegraphs. The materials cover the time span of August 1899 to October 22, 1901, the time period covering the take over of Winthrop Mine by National Steel. Correspondents are: Winthrop Iron Company, Oliver Iron Mining Company, I. B. Davis and Son, Manufacturers, Chapin Mining Company, M. A. Hanna and Company, and F. Braastad and Company.


  • 1899-08 - 1901-10-22


Conditions Governing Access

No restrictions. Open for research.

Conditions Governing Use

Permission to publish material from MSS-348, Winthrop Iron Company records, must be obtained from the University Archivist. The University Archivist may be reached by phone at 906-227-1225, or e-mail, The University Archivist may also be reached in Room 126 of the Learning Resource Center, Northern Michigan University, Marquette, MI.

Biographical / Historical

The Winthrop Iron Company owned the Winthrop Mine in the Ishpeming district on the Marquette range. The Winthrop Mine is in the southwest quarter of Section 21, Town 47, Range 27, and was once included in the "Braastad mines." The Winthrop Mine was first opened in the summer of 1870 and was operated by A. B. Meeker, A. G. Clark and H. J. Colwell. In 1877, the Winthrop Mine changed hands and was operated by Julius N. and Eugene G. St. Clair operating as the Winthrop Hematite Company. In August 1899 the Winthrop Mine was part of a large iron mine and vessel deal that was called one of the most important transactions in the history of the Lake Superior iron ore trade. The National Steel Company acquired the Chapin and Winthrop Mines and all of the steel fleets of the Mutual Transportation Company and the Menominee Transit Company, which were interests of the M. A. Hanna and Company. All properties, both ore and vessels, would continue to be handled by M. A. Hanna and Company. National Steel would be part of a merger creating U.S. Steel in 1901. The Winthrop Iron Company would become idle in 1901 and by 1902 was being operated by the Oliver Mining Company.


3 folders

Language of Materials



The materials in this collection, MSS-348, Winthrop Iron Company records, have been retained in original order. The correspondence is in reverse chronological order as received.


The Historical/Biographical note was compiled from information contained within the documents of the collection and from information retreived from the following publications:

The Bulletin of the American Iron and Steel Association, Volume 33, Number 18, Philadelphia, August 15, 1899 (page 138)

State of Michigan, Mines and Mineral Statistics byt Tom A. Hanna, Commissioner of Mineral Statistics, Iron Mountain, Michigan, December 1, 1902 (page 23)
Winthrop Iron Company records
Glenda K. Ward, Arrangement and Description Specialist
Description rules
Describing Archives: A Content Standard
Language of description
Script of description

Repository Details

Part of the Central Upper Peninsula and Northern Michigan University Archives Repository

Harden Learning Resources Center 126
1401 Presque Isle Ave
Marquette 49855 United States
906-227-1333 (Fax)


This collection guide includes collections from member organizations of UPLINK (the Upper Peninsula Digital Network) as well as the Central Upper Peninsula and Northern Michigan University Archives. UPLINK collections document the history of the Upper Peninsula broadly, while the Central UP & NMU Archives focuses on such topics as Northern Michigan University history, the local iron mining industry, and the politics, economics, religion, environment, and culture of the Central Upper Peninsula region.

These finding aids will give you an overview of the contents and context of each collection. Finding aids only exist for collections that each organization has shared with UPLINK or (in the case of the NMU Archives) for processed collections. For a more comprehensive list of collections that might help with your research, please contact the relevant heritage organization(s) directly.

Northern Michigan University
1401 Presque Isle Ave. • Marquette, MI 49855-5301 • 906–227–1000
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