Consmin, through its wholly owned subsidiaries, owns 90% of Ghana Manganese Company Limited (GMC). The remaining 10% is owned by the Government of Ghana. Operations from this mine have a history stretching back to 1916 when the first manganese material was mined from the site. AMS was awarded the Mining Contract by Ghana Manganese Company Limited in March 2017 which was reviewed annually until February 2019 when AMS was awarded a two-year contract extension. Scope of works are mainly Load and Haul on hourly hire.