The initial coal-handling deal between the terminal facility and the Alberta-based miner was set to expire March 31, 2017.
Under the extended contract, CVRI will send Westshore as much as 3 million tonnes per contract year from its export operations.
“This agreement underscores the importance of the long term CVRI-Westshore relationship and marks another important and positive step between the two organizations for future,” WTLP general manager Denis Horgan said.
CVRI is a subsidiary of Edmonton-headquartered operator Sherritt International.
Some of Westshore’s other coal clients include Teck Resources, Grand Cache Coal and Cloud Peak Energy.
It is considered Canada’s top export coal facility, with a record 27.3 million tonnes shipped in 2011.
The Westshore Terminals Limited Partnership is owned by Westshore Terminals Investment, and Westar Management has a long-term, renewable contract to operate and manage the facility.