Source regularly mined? (3)

I believe the answer is:

ore

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'source' is the definition.
(I have seen 'Source of mineral ' mean 'ore' so perhaps 'source' could also mean 'ore')

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ore that I've seen before include "Natural material from which metals can be extracted" , "Raw mineral" , "Mineral-bearing rock" , "Raw material" , "Mined material" .)

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