Mineral sources (4)

I believe the answer is:

ores

'mineral 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 "Sources of metal" , "Bauxite, haematite etc" , "Mineral deposits" , "Metal-bearing minerals" , "Mined minerals" .)

I've seen this clue in the King Feature Syndicate, The Wall Street Journal, the Universal, The Washington Post, the L.A. Times Daily and The Washington Post Sunday.

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