Rock group (4)

I believe the answer is:

ores

'rock group' 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 "Rocks or minerals containing metals" , "Sources of metal" , "Metal-bearing minerals" , "Bauxite, haematite etc" , "Mined minerals" .)

I've seen this clue in The Star Tribune, the Newsday and the King Feature Syndicate.

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