A reach of water (4)

I believe the answer is:

lode

(Other definitions for lode that I've seen before include "Vein of metal in the earth" , "Vein of metallic ore sounds heavy" , "Deposit of valuable ore found in surrounding rocks" , "mine to some extent" , "Vein of metal ore in surrounding rocks" .)

I've seen this clue in The Daily Mail.

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