PT. Sentosa Laju Sejahtera (SLS) is an Indonesian local mining and general contractor specializing in mineral coal, and quarry mines. PT. Sentosa Laju Sejahtera is a subsidiary company from PT. Sentosa Laju Energy, a coal trading company with trading volume over 8 million metric tonnes yearly. SLS is formed due to the rapid growth of mineral and coal demand in Indonesia and a strategic position for SLE Group to have an in-house mining company since SLS operates a coal mine in Bengalon, Kutai Timur, East Kalimantan Province.