Alder Gulch : définition de Alder Gulch et synonymes de. Alder Gulch (alternatively called Alder Creek) is a place in the U.S. state of Montana, where gold was discovered in May 26, 1863 by William Fairweather and a group of men, including Barney Hughes, Thomas Cover, Henry Rodgers, Henry Edgar and Bill Sweeney who were returning to the gold fields of Bannack.