The plant improvements have increased production to approximately 800 to 1,000 metric tons per hour. The acquisition also spurred the upgrade of Mainland's processing plant in order to position itself to meet future market demands.Īfter careful consideration, Superior Industries was awarded the two-phase contract for construction of a processing plant and to update the barge loadout system. From this acquisition, the name Mainland Sand and Gravel changed to Mainland Construction Materials. In 2014, Mainland Sand and Gravel was acquired by Summit Materials, a Denver-based construction materials company. As that supply was exhausted, the company moved to screening and crushing the alluvial gravels and then took to the hills to begin drilling, blasting, processing, and exporting granite rock from the site in the early 1990s. Mainland Sand and Gravel began its work at Cox Station by cleaning up and selling off this waste material as value-added road base. This spurred the acquisition of Cox Station by Mainland Sand and Gravel in 1983.

As a by-product, tonnes of screenings remained on site. The Cox Station Quarry dates back to the 1940s when Canadian National Railway held ownership, producing rail ballast. At the farthest navigable point up the mighty Fraser River nestled at the base of Sumas Mountain, British Columbia, sits Mainland Construction Materials' 400-acre Cox Station Quarry.

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