The Royal Canadian Mint, housed in a building reminiscent of a medieval castle, is a popular place for tourists and school groups who come to see the mint’s specialized presses stamp out collector coins, medallions and more. But tucked inside the nearly century-old building on Sussex Drive is another line of business that Canadians rarely see. The Crown corporation runs a world-class gold refinery, processing billions of dollars worth of precious metals each year. While scarcely known to the public, the mint’s refinery has garnered a reputation for honesty in the mining industry.