Société pour le Traitement du Terril de Lubumbashi (STL) is a leading industrial player focused on the processing and transformation of slag from the Gécamines concession in Lubumbashi, Democratic Republic of Congo. With a strong commitment to responsible sourcing, STL specializes in extracting valuable minerals such as copper, cobalt, zinc, and germanium, contributing significantly to the global supply of germanium.

STL operates a state-of-the-art hydrometallurgical processing plant and smelter, offering high-quality products like zinc oxide and white alloy. The company adheres to stringent standards established by the Responsible Minerals Initiative (RMI), ensuring that its mining practices are ethical and sustainable.

In addition to its extraction and processing activities, STL is actively engaged in community support and environmental stewardship, reinforcing its role as a socially responsible enterprise. With a recent investment of $75 million aimed at expanding its industrial capabilities, STL is poised for future growth while maintaining its commitment to ethical mining practices.