The Shanghai Gold Exchange, the world’s largest physical bullion marketplace, plans to expand trading collateral to precious metals, foreign exchange and securities from local currency now, according to statements posted on its website Thursday. The move is designed to “boost market services,” it said.

Starting Sept. 29, trading members will be allowed to use certified gold bars as margin to open contracts, the exchange said in a statement dated Aug. 25. The eligible assets will extend to silver, foreign currency, yuan-denominated stocks and bonds and other securities, according to a separate statement.