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State Permit to Mine

The State of Colorado Mining Permit is #M2016054. See the permit's status on the State of Colorado's website.

The State of Colorado Division of Reclamation, Mining and Safety has rules and regulations for gravel mining that state inspectors will enforce.


Overview of the Irwin Thomas Gravel Mine Operation

Map Location of Irwin Thomas PropertyA 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).  Below is some information related to the gravel mine operation, including conditions and requirements to protect the nearby residents.


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.

When was the gravel mine approved?

  • The permit was approved and signed in 2003 under a development agreement with Boulder County, which gave them a vested property right for the gravel mining.
  • The property owner submitted an application for annexation into the City in 2015 and desired to maintain their gravel mining permit. They requested approval of a PUD Plan, which mirrored the mining plan and conditions of approval as set forth in Boulder County.

Was there a public notification process?

  • A neighborhood meeting was held in January 2016 and public hearings were held with Planning & Zoning Commission in January 2017 and City Council in September 2017. Notification to all property owners within a 1,000-foot radius was mailed out and signs were posted on the property. The developers of the housing projects in Harvest Junction Village were also notified of the neighborhood meetings and public hearings.
  • There is no public input/community involvement at this time. Concerns may be stated, but final plans have been approved.

Are there any protections for nearby residents?

Can I see a copy of the approved plan?

  • The Planning & Zoning Commission approved the PUD Plan in January 2017 at a public hearing on the condition that it would not be final-approved until City Council approved annexation of the property.
  • The PUD Plan is for gravel mining and reclamation only. All materials must be hauled off-site to a processing plant. No processing will take place at this site.
  • The City Council approved annexation of the property in September 2017 but the annexation ordinance was not recorded with the county clerk (and thus finalizing the annexation) until February 2018.

Can you tell me more about the mining process?

  • Aggregate Industries has indicated that the mining process can take up to 10 years and the length of time depends on a number of factors, including market conditions/demand and when they start mining.
  • The mining pods will be mined one at a time so that only one pod or portions of two pods and the processing site are disturbed during any phase of mining. The plan is to move from west to east (from Martin Street toward 119th Street).


Conditions of the Project

  1. The Development consists of open mining and reclamation on approximately 151 acres of a 346 acre area on the Irwin/Thomas property located at the northwest intersection of Quail Road and North 119 Street.
  2. Roads/Parking - The following roads shall serve the Development subject to the conditions and limitations as further set forth: N. 1191h Street; and Highway 119 Bypass. Access to the site from State Highway 119 is shown on Sheet 269 of the Colorado Department of Transportation's construction drawings for State Highway 119, prepared by Carter and Burgess, and revised on March 13, 2002. This access may be revised only upon the approval of the Colorado Department of Transportation and the City of Longmont. The Developer shall obtain an access permit from the City of Longmont before utilizing North 119th Street for truck hauling. The Developer shall provide written consent from the Colorado Department of Transportation before conducting any construction work within any portion of the State Highway 119 right-of-way. Employee parking will be located in a designated gravel parking area adjacent to the scale house.
  3. Landscaping/Reclamation - The Developer shall provide revegetation for the Development in accordance with the City approved Mining Plan and Reclamation Plans. This revegetation shall include the installation of a seeded temporary screening berm, on the western edge of the project between any mined areas and any residentially zoned adjacent land and along the southern limits of the mining to screen the activity from the existing homes along Quail Road. The berm and seeding shall be completed before any mining is commenced south of State Highway 119 as shown on the Mining Plan. The berm shall be removed at the completion of mining activities on the south side of HWY 119.
  4. Signage - All signs for the Development shall comply with the applicable provisions of the Longmont Land Development Code. The Developer shall post one sign along N. 119th Street and one sign along Quail Road stating that mining will take place on the site in the future. The content, size, and location of the signs must be approved by the City of Longmont prior to installation.
  5. The Developer shall pay City of Longmont Transportation Investment Fees at the time of Building Permit.
  6. Enforcement - The City may conduct a periodic review of the Development as necessary to assure compliance with the Final Development Plan for Gravel Mining and Reclamation. This right includes the right to enter upon the property included within the Development at any time, without prior notice, to inspect for compliance with the terms of the PUD. All site visitors to the active mining site will be required to go through appropriate Mine Safety and Health Administration (MSHA) training, wear required safety equipment and check in at the scale house prior to entering the site.
  7. The proposed mining pods range in size from 11 to 21 acres and will be mined in the numbered sequence indicated on the PUD plan.
  8. The mining pods will be mined one at a time so that only one pod or portions of two pods and the processing site are disturbed during any phase of mining.
  9. The final reclamation plan includes five irregularly shaped ponds totaling about 73 acres with the area between the St. Vrain Creek and Burlington Northern Railroad consisting of about 25.5 acres of wetlands. The exact number and configuration of the ponds may vary based on the gravel resource and available fill material.
  10. The main access to site will be located on N. 119th Street, just south of St. Vrain Creek. No traffic will leave the site traveling south on N. 119th Street and trucks entering the site must not travel between Quail Road and the site access. There is a prohibition on truck hauling on Quail Road and south of the proposed access on North 119th Street.
  11. If sustained winds exceed 30 MPH at mining sites, loading and hauling operations will cease until the wind speed drops below 30 MPH. Conveying, and drilling operations may continue. Wind speed s measured at the mine site.
  12. Any ditch crossings or relocations shall be done only upon the consent of the ditch companies and in accordance with all applicable regulations.
  13. The Applicants shall obtain all applicable permits as required and necessary. This includes, but is not limited to: Floodplain Development permits, National Pollution Discharge Elimination System permit, Pollution Control Emission permits, Construction Materials Regular Operation (112) Reclamation permits, Water Discharge permits, City of Longmont Stormwater Construction Activity Permits and any well permit or temporary substitute supply plans required by the State Engineer.
  14. This use -must comply with all applicable state noise standards and state fugitive dust standards.
  15. The perimeter of the preservation zone depicted on the mining plan prepared by Rocky Mountain Consultants Inc., revised on 11/7/01, shall be marked with permanent monuments on the ground for the duration of the mining period. No mining activities shall occur within this defined area. The Applicants must reclaim all adjacent areas in accordance with the plans approved by the County before removing any monument.
  16. Outside storage, and the storage of fuel, oil, and grease, as well as the repair of equipment and machinery, are accessory uses to this approval, provided the Applicants meet all-applicable regulations.
  17. The property will comply with the City of Longmont's requirements for drainage.
  18. Development on the property shall comply with the City's Flood Plain Regulations based on the best floodplain data available at the time of development.
  19. This approval recognizes the following: Mining of approximately 3.5 million tons of material; A total of 150 average daily trips to the site, not to exceed 200 trips per day; Accessory processing of sand and gravel including screening and stockpiling. The mining operator may install a portable screening plant in the bottom of an active mining cell to sort material prior to removal from the site.
  20. The Applicants shall mitigate adverse impacts on neighboring wells caused by de-watering or other mining operations that result in lower ground water levels outside of mining boundaries. To meet this requirement, the Applicants shall install piezometers adjacent to residential areas sufficient to determine the effect on adjoining properties. If mining operations cause a reduction by more than 10% in water quality or quantity, the Applicants shall provide replacement water equal to or better in quantity and quality to the original conditions. In fulfilling this condition, the Applicants shall be responsible for conducting industry recognized water quality/ quantity analyses at least four times a year. The Applicants commit to monitor groundwater wells quarterly throughout the life of the mine.
  21. The mined portion of any mining pod in any phase shall be limited to that shown on the approved plan. If mining is underway in more than one pod at a time, the combined mining area shall not exceed 35 acres. For purposes of interpreting this condition, "combined mining area" shall mean any area that has been disturbed in preparation of mining, or in which mining is underway, or in which grading for reclamation for is underway. Once grading of a reclaimed mining pod is completed it will no longer be considered as part of the combined mining area. Revegetation and weed management within reclaimed pods will be ongoing throughout the life of the mine.
  22. The Applicants shall obtain an access permit from the City of Longmont before using North 119th Street for any truck hauling. Before issuing the access permit, the City may determine what, if any, mitigation measures are necessary. Mitigation measures may include, but are not limited to, payment by the Applicants of a pro-rata share of the costs of any acceleration or deceleration lanes, pavement rehabilitation, traffic control devices, or other measures necessary to correct adverse impacts to the street. Any costs associated with determining the proper mitigation measures are the responsibility of the Applicants.
  23. The Applicants shall obtain written consent from the Burlington Northern Railroad before conducting any construction work within any portion of railroad right-of-way.
  24. The Applicants shall require all sand and gravel loads hauled from the site in any Applicant-owned or leased trucks, or by haulers under contract to the Applicants to be covered with tarps, to prevent fugitive dust and gravel from escaping during hauling.
  25. Mining operations and truck hauling are limited to Mondays through Fridays: during the period of daylight savings time the hours of operation shall be 7:00 a.m. to 7:00 p.m., and during the period of standard time the hours of operation shall be 7:00 a.m. to 7:00 p.m. or daylight to dark (whichever is more restrictive). On Saturdays, work is restricted to equipment maintenance, maintenance necessary to ensure compliance with required permits, and hauling. Hauling on Saturdays is restricted to the hours listed above. No work at the site can occur on Sundays.
  26. The applicant shall require all Applicant- owned or leased trucks and all trucks under contract to the Applicants to utilize "white noise" back up beepers as opposed to standard back up beepers. All mining and loading equipment associated with the mining and reclamation shall also utilize "white noise" back up beepers.
  27. Site access onto N. 119th Street and Mining operations shall not inhibit safe use of the St. Vrain Greenway unless approved by the City of Longmont. Per the existing MOU between the City and the gravel operator, the City will install a 6' tall chain link fence 10' to 15' south of the St. Vrain Greenway trail to limit access from the trail into the mining site. Timing of the installation of the fence shall be coordinated with the operator to assure that the fence is in place when the operator is ready to begin mining the are north of HWY 119.
  28. All mining activities shall comply with the Memorandum of Understanding between the applicants, Aggregate Industries and the City of Longmont dated December 20, 2005.
  29. This PDP/FDP is conceptual in nature. Exact configuration of Mining and Reclamation may change subject to site conditions and material available for fill. Any changes will be coordinated with the landowner and the City of Longmont. Revisions to the mining and reclamation plan that do not require an amendment to the DRMS permit may be approved through the administrative Staff review process at the City of Longmont. The operator will submit any required Technical Revision to the DRMS.

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