Sierra de las Minas is a mountain range in eastern
Guatemala, extending 130 km west of the
Lake Izabal. It is 15–30 km wide and bordered by the valleys of the rivers
Polochic in the north and the
Motagua in the south. Its western border is marked by the
Salamá River valley which separates it from the
Chuacús mountain range. The highest peak is Cerro Raxón at 3,015 m. The Sierra's rich deposits of
jade and
marble have been mined throughout the past centuries. These small scale mining activities also explain the name of the mountain range.