The Royal Canadian Mint's .9999 fine gold standard — four nines purity — was achieved through refining processes the RCM developed and refined over decades at its Ottawa refinery, which processes gold from Canadian mines. By 2015, the mint was marketing this purity level as a deliberate distinction from the more common .999 fine used by most sovereign mints, including the Perth and Royal mints.
The Royal Canadian Mint's .9999 fine gold standard — four nines purity — was achieved through refining processes the RCM developed and refined over decades at its Ottawa refinery, which processes gold from Canadian mines. By 2015, the mint was marketing this purity level as a deliberate distinction from the more common .999 fine used by most sovereign mints, including the Perth and Royal mints.