Metal sources (4)

I believe the answer is:

ores

'metal sources' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ores that I've seen before include "Bauxite, haematite etc" , "Rocks or minerals containing metals" , "Mineral deposits" , "Sources of metal" , "Metal-bearing minerals" .)

I've seen this clue in The Wall Street Journal, the King Feature Syndicate and the Newsday.

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