Related Clues:

• Mineralogical deposits
• Lode rocks
• Mica and mispickel
• Contents of some deposits
• Ingot ingredients
• Bonanza discoveries
• Rock extractions
• Rush finds
• Rocks to refine
• Hollow spaces
• They're removed via shafts
• Extraction targets
• Miners' quarries
• Tramcar loads
• Metallurgist's raw materials