Mined stuff (3)
'mined stuff' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ore that I've seen before include "foreign money" , "Mineral-bearing material" , "not worth a lot to Danes" , "Unwrought iron" , "Material for smelting" .)
(Other definitions for data that I've seen before include "Facts given" , "Facts and figures as fed to computers (4)" , "Organised information" , "Collection of items of information" , "Gathered stats" .)