Related Clues:

• Salad dressing ingredient
• Cooking staple
• Bank deposit
• Deep-frying need
• Lubricate
• Mined-over matter
• Nickel in a pocket, say?
• Stuff of mine
• Raw material
• Hard rock, maybe
• Smeltery input
• Tanker's cargo
• Mined metal
• Van Gogh's 'Irises,' e.g.
• Bank deposit?