The value of the contract has not been disclosed.
The company will supply a tandem rotary railcar dumper including spare parts, technical assistance during installation, pre-commissioning, commissioning and performance testing.
The design of the equipment was achieved by working closely with Rio Tinto.
Delivery of the equipment is scheduled for the second quarter of 2013.
Metso is a global supplier of sustainable technology and services for mining, construction, power generation, automation, recycling and the pulp and paper industries.
