The Sangnong mine(상농광산) is one of the largest gold mines in North Korea and in the world.^[1] The mine is located in the center of the country in South Hamgyong Province.^[1] The mine has estimated reserves of 6.4 million oz of gold. The mine also has reserve40°36′00″N 128°43′30″E / 40.600°N 128.725°E / 40.600; 128.725s amounting to 200 million tonnes of ore grading 0.23% copper metal.^[1]

A trolleybus line opened in 1993, linking the mine to Sangnong-rodongjagu. It had two trolleybuses in the early 2000s, but only one later and none in 2020.^[2]