Crossword Genius

Miner discoveries (4)

Ross

I believe the answer is:

ores

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

I've seen this clue in The Wall Street Journal and The New York Times.
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