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.
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 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 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 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.
The U.S. Department of Interior Bureau of Mines presented a Certificate of Mine Rescue Training to Charles H. Isaacson in June 1914. It certified that Charles H. Isaacson of Virginia, Minnesota had been trained in the use of mine rescue apparatus at the Government Mine Rescue Station at Car No. 8 Virginia during which training he performed hard labor within a gallery filled with noxious and irrespirable gases and gave evidence of being qualified to use such apparatus within mines.
The U.S. Department of Interior, Bureau of Mines presented a Certificate of Award in Safety for disabling accident-free operation on July 1968. The certificate denotes the awarding of the Sentinel of Safety statue for display at the mine or mine offices.
Annual Report for 1928 detailing mine statistics, including mine names and locations, managers and officers, shipments, numbers employed, wages, accidents and fatalities.
Annual Report for 1924 detailing mine statistics, including mine names and locations, managers and officers, shipments, numbers employed, wages, accidents and fatalities
Correspondence, to Fred A. Cina (Executive Secretary, Range Municipalities and Civic Association) from Howard W. Siegel (Vice-Chairman, Northeastern Minnesota Rehabilitation Committee of the Junior Chamber of Commerce), regarding the Range Municipalities and Civic Association recommendations for the Northeastern Minnesota Rehabilitation Committee Advisory Committee on Mining.