Crossword Genius

That mineral of mine (3)

Ross

I believe the answer is:

ore

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'that mineral' is the definition.
(ore is a kind of mineral)

'of mine' is the wordplay.
'of' becomes 'o''.
'mine' becomes 're' (I can't justify this - if you can you should believe this answer much more).
'o'+'re'='ORE'

Can you help me to learn more?

(Other definitions for ore that I've seen before include "not worth a lot to Danes" , "Deposit of mine" , "Raw iron" , "Mineral containing valuable metal" , "Mineral deposit" .)

I've seen this clue in the Evening Standard.
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