Also known as Madame Moustache, Dumont was one of the most notorious gamblers during her time, especially during the California Gold Rush. She had traveled all over, making a living for herself playing cards. She eventually opened a gambling parlor, “Vingt-et-un,” in Nevada City, where no women were allowed except herself. It was incredibly successful, and she later joined forces with another experienced gambler, Dave Tobin, to open up the equally profitably Dumont’s Place. When the gold dried up, she left and traveled from place to place where she gambled, bringing a crowd to watch what she could do.