Irwin Thomas Gravel Mine Operation

Location of the gravel mine.

A gravel mining operation is expected to begin in 2020 on the property located south of Highway 119, east of the Harvest Junction development. The gravel mine was permitted by the Boulder County Commissioners in 2002 and was annexed into Longmont in 2018. The gravel mine operation was allowed into Longmont through a PUD (Planned Unit Development).

We have included on our main website project information related to the gravel mine operation, including conditions and requirements to protect the nearby residents. Visit https://www.longmontcolorado.gov/gravel-mine to learn more.

Where is the gravel mine located?

  • A gravel mine was permitted by Boulder County in 2002 to mine a 245-acre parcel of land south of Hwy 119, east of 119th Street, north of Quail Road and west of Martin Street.

Do you have questions about the gravel mine?

Please submit any questions to us using our Q&A tool below.

Location of the gravel mine.

A gravel mining operation is expected to begin in 2020 on the property located south of Highway 119, east of the Harvest Junction development. The gravel mine was permitted by the Boulder County Commissioners in 2002 and was annexed into Longmont in 2018. The gravel mine operation was allowed into Longmont through a PUD (Planned Unit Development).

We have included on our main website project information related to the gravel mine operation, including conditions and requirements to protect the nearby residents. Visit https://www.longmontcolorado.gov/gravel-mine to learn more.

Where is the gravel mine located?

  • A gravel mine was permitted by Boulder County in 2002 to mine a 245-acre parcel of land south of Hwy 119, east of 119th Street, north of Quail Road and west of Martin Street.

Do you have questions about the gravel mine?

Please submit any questions to us using our Q&A tool below.

Please submit your question below. We'll review it and respond during normal business hours. Please note that it may take us a few days to track down answers for you!

Q&A

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  • What percentage of the Gravel being mined is silica? What are the particle size and concentration of fugitive dust that will be released into the surrounding neighborhood 600 yards away? Will there be dust monitoring on site? If so where will results be posted? Why didn't the city require the mining company follow the Boulder County fugitive dust best practices? https://www.bouldercounty.org/environment/healthy-home/dust-health-concerns/ Practices such as : 1. Apply water to ground prior to, during, and after earthmoving operations. 2. Clear vegetation only from areas you will work right away. 3. Avoid overloading haul vehicles; the freeboard should not be less than 3 inches high. 4. Empty loader slowly and while dumping keep the bucket close to the ground. 5. Add surface Gravel and apply water to haul roads 6. Post and enforce lower speed limits on haul roads (10-15mph) And many more techniques.

    The neighbors asked 2 months ago

    The city does not have information regarding the amount of silica dust.  Please reach out to the contact email for Aggregate as they have the technical expertise to provide answers to these questions. The city does have conditions of approval for the gravel mine operation which are located on sheet 3 of the approved plan. Specifically, condition #11 requires the operator to cease loading and hauling operations when sustained wind speeds reach 30 MPH or higher. Condition #13 requires the operator to obtain permits from Public Works that relate to construction activity and condtion #14 requires the operator to comply with state fugitive dust standards. The site will be monitored and inspected by both city Public Works inspectors as well as state mining inspectors.  Alternatively, residents can contact the city’s Code Enforcement division at (303) 651-8695 to report a suspected violation of the standards.

    Silica,dust monitoring,fugitive dust,conditions of approval
    Silica dust monitoring fugitive dust conditions of approval

  • Do you know if this development will begin gravel mining this year? Can I be added to an update e-mail regarding this project? Lawrence D. Beshear LDBeshear@hotmail.com (303) 604-0019 (H)

    LDBeshear asked 3 months ago

    It is the city’s understanding that Aggregate Industries plans to start the mining in 2020.  At this time the city does not have a specific schedule from Aggregate.  We would recommend you reach out to the email address for Aggregate directly at us-c-irwinthomasinfo@lafargeholcim.com and ask to be added to their email list for more specific information about their project and scheduling.

    Project Schedule,Project update
    Project Schedule Project update

  • Is the information contained within the website the most current/up to date?

    LongmontSW asked 4 months ago

    Yes, the information provided on the City's website about this project, https://www.longmontcolorado.gov/gravel-mine, is the most current information that we have.

    Project Schedule
    Project Schedule