Gold Bullion Development Corp. (TSXV:GBB) (OTCPINK:GBBFF) announces that Castle Silver Mines Inc., a wholly-owned subsidiary of Gold Bullion, has filed a preliminary prospectus with the securities commissions of each of the provinces of Canada in connection with an initial public offering, and a secondary offering to the shareholders of Gold Bullion of shares of Castle Silver Mines by way of dividend in kind.