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Gravel mining operation begins in southeast Longmont

Mining and removal of gravel will continue for up to six years at Irwin Thomas Gravel Mine
Location of the Irwin Thomas Gravel Mine in Longmont.

The Irwin Thomas Gravel Mine started pre-mining operations this week.

The mine is located on a 295-acre parcel both north and south of Ken Pratt Boulevard, east of the Costco development, west of North 119th Street and north of Quail Road. Holcim-US, formally Aggregate Industries, will be completing the work.

The gravel mine was permitted by Boulder County in 2003 and annexed into Longmont in 2018 with the mining permit maintained as a Planned Unit Development.

After pre-mining operations are complete, the mining and removal of gravel will continue for up to six years, the city said. Mining will begin south of Ken Pratt and move north as work progresses.

Seeded earthen berms will be constructed west and south of the property to provide visual and sound barriers for nearby properties.

The city said that staff will monitor the mining operation to ensure compliance throughout the duration of the project.

Learn more about the mine and its operating permit on its city webpage.

Amy Golden

About the Author: Amy Golden

Amy Golden is a reporter for the Longmont Leader covering city and county issues, along with anything else that comes her way.
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