Company will issue options to the Matachewan First Nations to purchase 50,000 common shares in the

Suite 1005, 1155 René Levesque St. W.

Montreal. Quebec H3B 2J2 Phone 514-397-4000 / Fax 514-397-4002

ADDENDUM TO MATACHEWAN FIRST NATIONS JULY 29, 2013 PRESS RELEASE

August 2, 2013 - Gold Bullion Development Corp. (TSXV:GBB) (OTCPINK:GBBFF) (the “Company” or “Gold Bullion”) announces that, as previously disclosed in the July 29, 2013 press release, the Company will issue options to the Matachewan First Nations to purchase 50,000 common shares in the capital of the Company, exercisable at $0.10 per share for a period of five years. All securities issued under the Memorandum of Understanding will be subject to a hold period of four months and one day. As the original agreement with the Matachewan Band was signed back in 2011, in order to fulfill the terms of the agreement that stated both the 50,000 shares and 50,000 options were to be issued within 18 months of that time, it is the intention of the Company to issue the 50,000 shares and 50,000 options forthwith upon receipt of Exchange approval.

The transaction is subject to approval by the TSX Venture Exchange.

Castle Silver Mines Inc.

Castle Silver Mines Inc. was incorporated in March 2011 as a wholly owned subsidiary of Gold Bullion, for the purpose of taking over the silver assets and exploration activities carried out by Gold Bullion, so that Gold Bullion could devote itself solely to exploration for gold. Castle Silver Mines Inc. currently owns the Castle Silver Mine property located in Gowganda, Ontario.

About Gold Bullion Development Corp.

Gold Bullion Development Corp. is a TSX Venture-listed junior natural resource company focusing on the exploration and development of its Granada Property near Rouyn-Noranda, Québec. Additional information on the Company’s Granada gold property is available by visiting the website at www.GoldBullionDevelopmentCorp.com and on SEDAR.com.

“Frank J. Basa”

Frank J. Basa, P.Eng.

President and Chief Executive Officer

For further information contact:

Frank J. Basa, P.Eng., President and CEO at 1-514-397-4000

Neither the TSX Venture Exchange nor its Regulation Service Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release. This news release may contain forward-looking statements including but not limited to comments regarding the timing and content of upcoming work programs, geological interpretations, receipt of property titles, potential mineral recovery processes, etc. Forward-looking statements address future events and conditions and therefore, involve inherent risks and uncertainties. Actual results may differ materially from those currently anticipated in such statements.