Related Clues:

• Mine output
• In the '40s they were Big
• Raw rocks
• Things tunnelers look for
• Tramcar contents
• Underground discoveries
• Contents of trams
• Miners' diggings
• Mine yields
• Mesabi loads
• Iron and manganese, e.g.
• They could use refinement
• Meteor materials
• Metals from the earth
• Raw metals, e.g.