Permanently? No. Cave-ins can be dug out, streams can be re-channeled and water pumped out. But you could make the cost of repairing the mines to working order expensive and time-consuming.
Was it possible for GreatJon & the northern raiders to somehow put the western mines out of commission permanently, to kick House Lannister where it really hurts ? Caving in the entrances, diverting streams into the pits etc. ? Sorry if this is a stupid question, but my knowledge of medieval mining engineering is nil!
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