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Mining

Title: Comparison of Costs
Type: Table
Date: 1931
Source: Minnesota Historical Society

Description: This table presents data on the costs of mining in open pit and underground mines.

Comparison of Costs

Activities:

  1. Has the amount of ore that's been mined gone up every year?



    Answer:
  2. Approximately how much more total ore was mined open-pit than underground?



    Answer:
  3. During the four years shown, was the "total average cost per ton" ever cheaper for underground mining than it was for open-pit?



    Answer:
  4. According to the "total average cost per ton" column of the table, about how much more expensive was underground mining than open-pit mining?



    Answer: