Request for translation help

[Cassius]

      This is an AE31, 10.2 Chinese coin I think an amulet/charm.  The obverse is ' Wan Li Tong Bao'- a coin of the Wan Li Ming emperor (1572-1620).   I don't understand any of the reverse legend.  I am not sure if this is a coin or an amulet.  Any help would be very appreciated.

[shanxi]

“礦銀四錢” kuang yin si qian

translation: mineral silver four qian

[Cassius]

Yes, Thank You.  I had figured out the symbol 'Four'.  Qian appears to mean 'wealthy or well off' , so I guess it means something like 'Four times wealthy in silver'  (?)

[shanxi]

Hello, I didn't translate qian because it is a weight unit you can't translate directly. Same as mace.

1 Qian = 3.78g (originally, old value)