Contributor: Minnesota Museum of Mining / Creator: Williams, J. Morley - Minnesota Digital Library Search Results

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Step 2 of testing and ore sample: Crusher in the mine lab, Minnesota

Step 1 of testing and ore sample: Gathering ore sample for the mine lab from the ore train, Minnesota

Step 3 of testing and ore sample: Grinding the sample in the mine lab, Minnesota

Step 5 of testing and ore sample: Ring stand and crucible, Minnesota

Step 4 of testing an ore sample: Riffler in the mine lab, Minnesota