Cox Station Quarry is located 11 kilometres upstream of the Abbotsford Mission Bridge on the north side of Sumas Mountain in Abbotsford, British Columbia. Originally referred to as Cox Landing, the site dates back to the early 1900s, when it served as a landing for paddle wheelers. During the 1940s and 1950s, CN Rail operated a mine at the site, extracting aggregate for railway construction.

The original aggregate shipped from Cox Station was sourced from an alluvial sand and gravel deposit, which was readily exhausted. By 1987, aggregate production had shifted to drilling and blasting granite, granodiorite, and quartz diorite of the Jurassic-Cretaceous Coast Plutonic Complex.

The quarry produces 100 percent fractured aggregate through the drilling and blasting of bedrock. Following crushing, products are transported by conveyor to a barge-loading facility on the Fraser River. More than 95 percent of production is shipped by barge, primarily to distribution depots along the Fraser River. Products include road base, clear crushed rock, rip rap, washed sand, septic sand, and landscape armour rock. Production and shipments were reported at 2 to 3 million tonnes annually in 2014, at which time permitted reserves indicated a remaining mine life of 50 years or more (Exploration and Mining in British Columbia, 2014). More recent reports estimate annual production at approximately 3 to 4 million tonnes (Provincial Overview of Exploration and Mining in British Columbia, 2024).

Mainland Sand & Gravel operated the quarry until September 2014, when the company was acquired by Summit Materials Inc. Following the acquisition, Mainland Sand & Gravel was rebranded as Mainland Construction Materials and became part of Summit Materials' network of aggregate operations. Mainland Construction Materials continues to own and operate the Cox Station Quarry.