Welcome to Spencer Quarries, Inc. We are here to help you with all of your Quartzite, Sand, Gravel and Asphalt needs. Contact us

An excavator helps to move large rocks at spencer quarry


Who We Serve

City and county governments, DOTs, businesses, and individual customers trust SQI to provide the highest quality materials for every project and a high level of expertise with every interaction.

Counties & Cities

SQI is proud to offer our products and services to county and city governments in the area. They know they can rely on SQI's partnership.


We have decades of experience working on transportation projects, and the expertise we've built makes us ideal collaborators for these complex initiatives.

Businesses & Households

Even businesses and individuals taking on smaller projects can get what they need from SQI. With our breadth of knowledge and focus on customer care, we'll help you get the job done right.

Our Team

Meet the team leading Spencer Quarries Inc.

Looking for work?

We're always looking to expand our crew. If you’re honest, respectful, and career-oriented, you’ll fit in on the Spencer Quarries Inc. team. We hire part-time and full-time employees at both Spencer Quarry and Commercial Asphalt.

See Open Positions
Spencer Quarry team members stand outside in the sunshine and chat


Spencer Quarry has operated near Spencer, SD, for more than a century and was incorporated as Spencer Quarries Inc. in 1944. The site originally produced building stones and now has an impressive, expanded product line, including railroad ballast, aggregates for concrete and asphalt, and rip rap.

In 1992, Spencer Quarries Inc. acquired Commercial Asphalt in Mitchell, SD. Commercial Asphalt itself was established in 1968 and has greatly expanded its service area and production capacity since then with additional plant sites and portable plants.

Spencer Quarries Inc. has always been a proud contributor to community initiatives, especially those benefiting youth.