Deep Storage: Deep-Storage gold is the portion of the U.S.
government-owned Gold Bullion Reserve that the U.S. Mint
secures in sealed vaults, which are examined annually by
the Department of Treasury's Office of the Inspector
General. Deep-Storage gold comprises the vast majority of
the Reserve and consists primarily of gold bars. This
portion was formerly called "Bullion Reserve" or "Custodial
Gold Bullion Reserve."
