There have been eight coinage mints in operation at various times in the United States. zooqle Of these, only four were active in the late 20th century. The mint in Philadelphia also produces general coinage. The mint in San Francisco, Calif. is now used primarily for gold minting. These mints are under the direction of the which is a branch of the Department of the Treasury.Countries in which the demand for coins is not sufficient to make a national mint economically feasible have their coins struck in foreign mints. The British mint has struck coins for other countries since the 16th century.