Discovery of gold near South Pass in the 1860s led to the creation and settlement of short-lived South Pass City, Wyo. and other settlements nearby. The Carissa Mine was one of the richest, but between 1867 and 1869, 1500 lodes were located during the rush, and as many as 2,000 miners and others may have lived in the little town or on their claims. By the early 1870s, only a few hundred were left. Sporadic gold production has continued since, however, with systematic prospecting by an American subsidiary of a Canadian firm permitted as recently as 2006.