Miner concern (4)
(Other definitions for ores that I've seen before include "Sources of metal" , "Mined minerals" , "Metal-bearing minerals" , "Mineral deposits" , "Bauxite, haematite etc" .)
'miner concern' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ore that I've seen before include "Mineral-bearing material" , "Raw mineral" , "Unwrought iron" , "Mineral aggregate" , "Small coins" .)