Mined find (4)

I believe the answer is:

lode

(Other definitions for lode that I've seen before include "Vein containing metal ore" , "A deposit of ore, say gold" , "Deposit of valuable ore found in surrounding rocks" , "Vein of metallic ore sounds heavy" , "Mineral vein" .)

I've seen this clue in The New York Times and the LA Times.

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