Private company

Oliver Iron Mining Company

American mining company

MinnTac also known as Minnesota Taconite, formerly known as the Oliver Iron Mining Company, was a mining company operating in Minnesota, United States. It was one of the most prominent companies in the early decades of mining on the Mesabi Range.2 It is part of U.S. Steel.1 Wikipedia text CC BY-SA 4.0

Last updated Oct 20, 2026.

Overview

1890Founded1

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MinnTac also known as Minnesota Taconite, formerly known as the Oliver Iron Mining Company, was a mining company operating in Minnesota, United States. It was one of the most prominent companies in the early decades of mining on the Mesabi Range.2

Corporate structure

Oliver Iron Mining Company is part of a group headed by Nippon Steel Corporation. 150 entities, 13 countries on record. Switch between the flow chart and the network, and select any entity to see its details.

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); subsidiaries listed in Exhibit 21 of annual reports filed with the SEC; subsidiaries, stakes and holdings from Wikidata (CC0). Each entity in the chart links to its source.

Subsidiaries and ownership

Parent company

From Wikidata.1

Timeline

  1. 1901Acquired Acquired by U.S. Steel1
  2. 1890Founded Founded1

Sources

The numbers on this page point here. Each one links to the record it came from.

  1. 1
  2. 2