The Hull-Rust-Mahoning mine established in 1892 in Hibbing is one of the largest open pit iron ore mines in the world, with a 1.5 by 3.5 mile footprint and depths up to 600 feet. It supplied as much as a fourth of all the ore mined in the U. S. during its peak production during WWI and WWII.
Contributing Institution:
University of Minnesota Duluth, Kathryn A. Martin Library, Northeast Minnesota Historical Collections
An unidentified underground mine pit with a steam locomotive Number 1 of the Duluth and Iron Range railway at work, probably at Tower or Ely, Minnesota, on the Vermilion Iron Range.
Contributing Institution:
University of Minnesota Duluth, Kathryn A. Martin Library, Northeast Minnesota Historical Collections
The Minnesota Iron Company, incorporated in 1890, was engaged in underground iron ore mining on the Vermilion Range that ran between Tower and Soudan on the west and Ely and Winton on the east of the range.
Contributing Institution:
University of Minnesota Duluth, Kathryn A. Martin Library, Northeast Minnesota Historical Collections
Marion Model K steam shovel with a two and a half cubic yard dipper working along side a 25 ton wooden ore car for the Oliver Iron Mining Company in the open pit Mountain Iron mine.
Contributing Institution:
University of Minnesota Duluth, Kathryn A. Martin Library, Northeast Minnesota Historical Collections
Gathering of the officers, superintendents, captains, foremen, engineers, and engineer's helpers of the Hibbing Chisholm district offices of the Oliver Iron Mining Company on the occasion of the promotion of Pentecost Mitchell from general superintendent to president.
Contributing Institution:
University of Minnesota Duluth, Kathryn A. Martin Library, Northeast Minnesota Historical Collections
Step 2 of 5 in a series of photographs depicting the process of testing an ore sample. In this step the ore sample is dumped into the crusher in the mine lab in step 2.
Step 1 of 5 in a series of photographs depicting the process of testing an ore sample. In this step an ore sample is gathered from the ore train for testing in the mine lab in step 1.
Step 3 of 5 in a series of photographs depicting the process of testing an ore sample. In this step the iron ore sample is ground through a 200-mesh screen in the mine lab in step 3.
Step 5 of 5 in a series of photographs depicting the process of testing an ore sample. In this step a ring stand and crucible are used to determine the chemical analysis of the iron ore sample in the mine lab in step 5.
Step 4 of 5 in a series of photographs depicting the process of testing an ore sample. In this step the crushed iron ore sample is dumped into the riffler to get a representative sample in the mine lab in step 4.
Trout Lake beneficiation (or benefication) plant near Coleraine was completed in 1909-1910, to raise the iron content of lean, sandy ores. Beneficiation (or benefication) is one of a variety of process that treats the raw iron ore to separate the ore into the usable mineral and the part of the ore that is unusable (gangue).
Contributing Institution:
University of Minnesota Duluth, Kathryn A. Martin Library, Northeast Minnesota Historical Collections