Small creatures found in silver mines (6)

I believe the answer is:
vermin
'small creatures' is the definition.
'vermin' can be an answer for 'creatures' (I have seen 'Odious creatures' mean 'vermin' so perhaps 'creatures' could also mean 'vermin'). I'm not sure about the 'small' bit.
'in silver mines' is the wordplay.
'in' says the answer is hidden in the clue.
'VERMIN' is hidden within 'silver mines'.
'found' acts as a link.
Can you help me to learn more?
(Other definitions for vermin that I've seen before include "Common animals and birds, like rats and crows" , "Odious creatures" , "Eg foxes, rodents, vile persons etc." , "Harmful or disease-ridden animals" , "Pestilent creatures" .)
