Western Slope Materials (WSM) is a family-owned and operated aggregate mining and construction materials supply company based in Carbondale, Colorado. With pits located in Silt and Carbondale, WSM provides construction aggregates, crushed stone, natural stone, concrete aggregates, concrete materials and ready-mixed concrete to the Aspen, Snowmass, Roaring Fork Valley and Vail Valley areas of Western Colorado.

At Western Slope Materials, we provide high-quality aggregate products and unsurpassed customer service. Visit either of our pit locations to meet with one of our friendly and experienced team members for help with all of your sand, stone, gravel and concrete needs.



  • Tandem Delivery
  • End Dump Delivery
  • Scale Usage

Side Bar 1 WSM