Mineral deposits (4)

I believe the answer is:

'mineral deposits' is the definition.
(I've seen this before)

This is all the clue.

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

I've seen this clue in The Mirror, the USA Today, The Star Tribune, The Irish Times and the LA Times.

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