Crossword Genius

Mineral sources (4)

Ross

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 Washington Post, the USA Today, the King Feature Syndicate, the L.A. Times Daily, The Washington Post Sunday, the Universal and the Wall Street Journal.
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