The best-known U.S. Mint building in San Francisco is at Fifth and Mission streets, right across the street from the Chronicle building. The Old Mint is an imposing classicalstructure, but it's been retired as a money-making plant for more than 80 years.

By the early 1930s, the building was too antiquated to meet the increased demand for coins. So the U.S. Treasury found a second location, at Duboce and Buchanan streets, wherea natural rock promontory could function as another layer of security.

A search through The Chronicle's archive uncovered photos of the construction of the New Mint in 1936, as well as the coin production work happening inside.

To read the complete article, see:
How San Francisco's 'modern' mint rose from bedrock(https://www.sfchronicle.com/chronicle_vault/article/How-San-Francisco-s-modern-mint-rose-from-13548898.php)