South Gateway was part of the once thriving community of Pluma.  In 1895, the Lead Evening Call newspaper described the small community of Pluma, strategically placed between Deadwood and Lead, as “one of the most thriving places around”.  Soon after, Deadwood began marketing itself as the location of the “richest 100 square miles on earth”.  Though Lead had a larger population and Deadwood became the distribution hub of commerce for western South Dakota, Pluma ultimately became the “crossroads” for these communities.

Pluma’s success was its location:  at the confluence of Gold Run Creek (todays US Highway 85 West) and Whitewood Creek (todays US Highway 385 South).  Pluma also became a desirable spot for milling, utility and community-support services.  Pluma was the home of the large Kildonan Mill, the Troy Steam Laundry and the Belt Light & Power Company.  By 1902, Pluma had its own post office, and in 1910 the Treber Ice House was built here.  The concrete foundation in front of the information center is remnants from this building.  In 1985, Pluma was annexed into the Deadwood city limits.