Source of eg iron and gold close to Kalgoorlie (3)
I believe the answer is:
ore
'source' is the definition.
(I have seen 'Source of mineral ' mean 'ore' so perhaps 'source' could also mean 'ore')
'gold close to kalgoorlie' is the wordplay.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'close to' indicates one should take the final letters (the close of something is the end).
The final letter of 'kalgoorlie' is 'e'.
'or'+'e'='ORE'
'of eg iron and' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for ore that I've seen before include "Naturally occurring mineral" , "14 [CURRENCY UNIT]" , "Valuable resource" , "Raw mineral" , "not worth a lot to Danes" .)