Section 23. All gold and silver bullion and coin brought to the Mint for coinage and which is inferior to the st

23. All gold and silver bullion and coin brought to the Mint for coinage and which is inferior to the standard fineness prescribed by this Act, or which, from brittleness or other cause, is unfit for coinage, shall, in case it is refined, be subject, in addition to the duty and charge aforesaid, to such charge on account of the loss and expense of refining as the Governor General in Council prescribes in this behalf. Certificate for produce of bullion.