Here’s a map. The Mint is centrally located at the corner of Mission and 5th St in San Francisco, just down the street from the Powell St BART station (BART runs all night on NYE, by the by); readily accessible from highways 101 and 80, and a number of Muni bus lines, and supremely accessible by bike and taxi.  There’s a big parking garage kitty corner to venue you can park at all night (for a fee).