Irwin Thomas Gravel Mine Operation

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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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    I was curious as to the start date of the mine operations. The website says it will start in 2020, is that still the case? Is there a termination date to their permit if they don’t start operations?

    Steveneo35 asked about 1 month ago

    Thank you for reaching out.  While the mining operator had planned on starting in 2020, it appears unlikely this will occur.  The mining operator is still waiting for approval of their permit from the State. Once they get the permit, they are required by the City to construct a berm around the perimeter of the mining area to serve as a buffer between the mining operations and the adjacent residential properties.  As far as the land use, the zoning permits this use and there is no termination date, per se. However, once the mining operator obtains a mining permit from the state, there will likely be benchmarks and deadlines.

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    How will the mining on this site occur, through blasting or drilling or both?

    Ann asked about 2 months ago

    Hello Ann, thank you for reaching out regarding the Irwin Thomas Gravel Mine. It is our understanding that the mining company will be drilling for the gravel. If you would like more detailed information about Aggregate Industries’ practices for mining at this site, please contact them through the email link provided on the City’s web page regarding this mine: https://www.longmontcolorado.gov/departments/departments-n-z/planning-and-development-services/active-development-log-and-map/irwin-thomas-gravel-mine. Thank you!


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    When do you expect to begin work and in what order do you plan to work the pods? Do you expect that some seasons will be busier than others? (Ie: more work in spring and summer than in winter)

    Erica asked 3 months ago

    Hi Erica, thank you for contacting us. The gravel mine operator is currently going through the permitting process through the State of Colorado and the City does not have any information at this time about when they will begin mining.  

    The gravel mine operator is required to construct a 6-foot tall landscaped berm along the western and southern sides of the property before they can commence mining operations; and the pods will be mined from west to east. You may want to contact the mining operator (us-c-irwinthomasinfo@lafargeholcim.com) about their estimated timeline to start work. Thank you!

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    Hello! I have a few questions about the gravel pit as I'm considering buying a house in Harvest Junction and want to make sure i understand what's going at that site. a First, I've seen two different maps that showed different numbered areas for each site and the order is different. Will the site closest to Harvest Junction be first or will it be fifth? Also, what is the plans for the area after excavation work is complete? I don't see any details on their responsibilities and how the land will be used afterwards. Who owns the property? How deep are they allowed to dig? Can they use detonations? Finally, they haven't started work yet. Do you know when they plan to begin? I appreciate your time!! Thank you, Laura Nelson

    Laura430430 asked 5 months ago

    Hi Laura, thank you for reaching out. The mining area closest to the residential area of Harvest Junction will be the first to be mined. The City does not have the exact time frame for when that will begin. The mining company is currently having their permit request under review from the State of Colorado. Before they are permitted to mine, they must build a 6-foot tall berm along the western edge of their property to buffer the mining activity from the Harvest Junction neighborhood. After mining is completed, whenever that is, they will leave ponds. The property is owned by Golden Farm Ltd. The City is unable to answer the remainder of your very specific questions because a permit has not been issued by the State yet. We do not have a time frame for when that will happen or when they will begin.  

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    We're thinking of buying a home in the vicinity of the proposed gravel pit. Do you have any idea when the work on the gravel pit will begin?

    mgoxnard asked 9 months ago

    The city does not have the current start date of gravel mine operations. The applicant is still working through the permitting process with the state. 

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    I have heard that this gravel mine is planned, but not yet underway. I have also heard that the plans to start this mining operation have been halted. Can you tell me if this planned gravel mining operation is still going to start in 2020? Lawrence D. Beshear (303) 604-0019 (H) LDBeshear@hotmail.com

    LDBeshear asked 10 months ago

    Dear Mr. Beshear, Thank you for taking the time reach out. At this time, there is still an active land entitlement for a gravel mine at this location. The applicant, Aggregate Industries, is working toward obtaining their state permits.


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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 about 1 year 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.

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    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 about 1 year 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.

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

    LongmontSW asked over 1 year 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.

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    I live on the East side ofWatermark @ Harvest Junction apartments. I live on the east side facing the mine. Can you tell me when the mine will fully start? They came out and marked the field. My lease is up in May and I have lung cancer so I need to know when this is gonna fully start

    KC asked 8 months ago

    Thank you for contacting the Engage Longmont team.  At this time we have no specific information from the gravel mine as to when they anticipate starting. You may contact Aggregate Industries for more information at the contact info provided on the web page. Thank you.