Crossword Genius

Valuable rocks (4)

Ross

I believe the answer is:

ores

'valuable rocks' is the definition.
(I've seen this in another clue)

This is the entire clue.

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

I've seen this clue in the Penny Press and the King Feature Syndicate.
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