Rainy River is an open-pit mine operated by New Gold Inc. The mine is
centered in Richardson Township, in northwestern Ontario, Canada.
Rainy River commenced processing ore in September 2017, and commercial
production followed in October 2017. Development of the underground mine
began in the second half of 2018.
The open-pit mine is a conventional truck-and-shovel mining operation, while
the underground is designed as a mechanized-ramp access mine that will use
longitudinal longhole open stoping techniques to exploit the underground
reserves.
The Rainy River process plant includes crushing, grinding, gravity
separation, cyanide leaching, carbon-in-pulp (CIP), carbon stripping and
regeneration, electrowinning, and doré production. Tailings are deposited in
the tailings management area (TMA), and TMA water is reclaimed and returned
to the process plant.