Data / Mines / Colorado / Larimer County
Mines in Larimer County, Colorado: 21 open mines
MSHA lists 21 open mines in Larimer County, Colorado, run by 19 operators and employing 154 people. Since January 1, 2022 its inspectors issued 411 citations and orders there with $118,471 in proposed penalties, and operators reported 27 injury or illness cases. The operators with the most open mines are Loveland Ready Mix Concrete Inc; Coulson Excavating Company Inc; Colorado Lien Company. Data from MSHA, November 6, 2026.
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- Open mines
- 21
- Operators
- 19
- Employees
- 154
- Intermittent
- 12
- Active
- 9
- Mines run by individuals, counted and not listed
- 2
- Citations and orders since January 1, 2022
- 411
- Significant and substantial
- 74 (18.0%)
- Closure orders
- 11
- High negligence or reckless
- 46
- Proposed penalties
- $118,471
- Amount paid so far
- $109,169
- Inspections
- 190
- Inspector hours on site
- 1,361
- Citations per inspection
- 2.16 (all mines 2.30)
- Accident reports
- 27
- Injury and illness cases
- 27
- Fatalities
- 0
- Latest MSHA record
- October 22, 2026
Operators with the most open mines in Larimer County, Colorado
Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Loveland Ready Mix Concrete Inc | 2 | 4 | 41 | $8,721 | 0 |
| Coulson Excavating Company Inc | 2 | 10 | 22 | $3,822 | 0 |
| Colorado Lien Company | 1 | 25 | 54 | $16,038 | 7 |
| Stone Wholesale, Inc. | 1 | 12 | 45 | $22,932 | 0 |
| Arkins Park Stone Corp | 1 | 24 | 41 | $11,739 | 13 |
| Colorado Flagstone Inc | 1 | 7 | 30 | $3,898 | 1 |
| Sprague Stone LLC | 1 | 11 | 20 | $2,911 | 0 |
| Colorado Quarry 1, LLC | 1 | 8 | 19 | $2,603 | 0 |
| Masonville Stone Company | 1 | 3 | 16 | $4,054 | 0 |
| Simon Contractors | 1 | 5 | 14 | $2,079 | 0 |
| Mill Iron Mining | 1 | 1 | 13 | $7,386 | 0 |
| Larimer County Road & Bridge Department | 1 | 3 | 11 | $1,650 | 0 |
| Loudwire Diesel LLC | 1 | 2 | 11 | $1,295 | 0 |
| Glacier Rock Company | 1 | 1 | 10 | $1,499 | 1 |
| Loukonen Brothers Stone | 1 | 1 | 10 | $1,116 | 0 |
| Connell Resources, Inc. | 1 | 3 | 4 | $596 | 0 |
| Blue Mountain Stone Inc | 1 | 8 | 1 | $133 | 0 |
Operators with the most citations in Larimer County, Colorado
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Colorado Lien Company | 1 | 25 | 54 | $16,038 | 7 |
| Stone Wholesale, Inc. | 1 | 12 | 45 | $22,932 | 0 |
| Loveland Ready Mix Concrete Inc | 2 | 4 | 41 | $8,721 | 0 |
| Arkins Park Stone Corp | 1 | 24 | 41 | $11,739 | 13 |
| Colorado Flagstone Inc | 1 | 7 | 30 | $3,898 | 1 |
| Coulson Excavating Company Inc | 2 | 10 | 22 | $3,822 | 0 |
| Sprague Stone LLC | 1 | 11 | 20 | $2,911 | 0 |
| Colorado Quarry 1, LLC | 1 | 8 | 19 | $2,603 | 0 |
| Masonville Stone Company | 1 | 3 | 16 | $4,054 | 0 |
| Simon Contractors | 1 | 5 | 14 | $2,079 | 0 |
| Mill Iron Mining | 1 | 1 | 13 | $7,386 | 0 |
| Larimer County Road & Bridge Department | 1 | 3 | 11 | $1,650 | 0 |
| Loudwire Diesel LLC | 1 | 2 | 11 | $1,295 | 0 |
| Glacier Rock Company | 1 | 1 | 10 | $1,499 | 1 |
| Loukonen Brothers Stone | 1 | 1 | 10 | $1,116 | 0 |
| Connell Resources, Inc. | 1 | 3 | 4 | $596 | 0 |
| Blue Mountain Stone Inc | 1 | 8 | 1 | $133 | 0 |
Mines with the most citations
Open mines, ranked by citations and orders since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Owl Canyon Quarry & Mill | Colorado Lien Company | Larimer County, CO | Dimension limestone | 25 | 54 |
| Stone Wholesale Brownstone Quarry | Stone Wholesale, Inc. | Larimer County, CO | Dimension stone | 12 | 45 |
| Trupp Loveland | Arkins Park Stone Corp | Larimer County, CO | Dimension sandstone | 24 | 41 |
| Loveland Ready-Mix Concrete Inc Sand and | Loveland Ready Mix Concrete Inc | Larimer County, CO | Construction sand and gravel | 2 | 31 |
| Rocky Road Quarry | Colorado Flagstone Inc | Larimer County, CO | Dimension sandstone | 7 | 30 |
| Sprague Stone LLC | Sprague Stone LLC | Larimer County, CO | Dimension sandstone | 11 | 20 |
| Meadow Hollow Quarry | Colorado Quarry 1, LLC | Larimer County, CO | Dimension stone | 8 | 19 |
| Masonville Quarry | Masonville Stone Company | Larimer County, CO | Dimension stone | 3 | 16 |
| Coulson Portable | Coulson Excavating Company Inc | Larimer County, CO | Construction sand and gravel | 5 | 14 |
| Portable #1 Fort Collins | Simon Contractors | Larimer County, CO | Construction sand and gravel | 5 | 14 |
| Heitf Pit | Mill Iron Mining | Larimer County, CO | Construction sand and gravel | 1 | 13 |
| Portable Crusher | Larimer County Road & Bridge Department | Larimer County, CO | Construction sand and gravel | 3 | 11 |
| Loudwire Quarry | Loudwire Diesel LLC | Larimer County, CO | Construction sand and gravel | 2 | 11 |
| Knox Pit | Loveland Ready Mix Concrete Inc | Larimer County, CO | Construction sand and gravel | 2 | 10 |
| Weaver Quarry | Loukonen Brothers Stone | Larimer County, CO | Dimension sandstone | 1 | 10 |
| Glacier Rock Pit | Glacier Rock Company | Larimer County, CO | Construction sand and gravel | 1 | 10 |
| Coulson Portable Wash Plant | Coulson Excavating Company Inc | Larimer County, CO | Construction sand and gravel | 5 | 8 |
| Portable Wash Plant #1 | Connell Resources, Inc. | Larimer County, CO | Construction sand and gravel | 3 | 4 |
| Barnard Quarry | Blue Mountain Stone Inc | Larimer County, CO | Dimension sandstone | 8 | 1 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 10 | 47.6% |
| Dimension sandstone | 5 | 23.8% |
| Dimension stone | 4 | 19% |
| Dimension limestone | 1 | 4.8% |
| Crushed, broken limestone | 1 | 4.8% |
Citations and injury cases by year
Calendar years since 2022; 2026 runs to the date of the MSHA files.
| Year | Citations and orders | Significant and substantial | Proposed penalties | Injury and illness cases |
|---|---|---|---|---|
| 2022 | 77 | 8 | $23,515 | 6 |
| 2023 | 125 | 18 | $42,695 | 4 |
| 2024 | 61 | 7 | $18,320 | 12 |
| 2025 | 74 | 12 | $15,492 | 5 |
| 2026 | 74 | 29 | $18,449 | 0 |
Standards cited most at mines in Larimer County, Colorado
Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.
| Standard | What the part covers | Citations |
|---|---|---|
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 42 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 34 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 23 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 18 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 17 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 16 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 16 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 15 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 14 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 14 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 14 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 13 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.4101 | Surface metal and nonmetal mines | 8 |
Injury and illness cases at mines in Larimer County, Colorado
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Permanent disability | 1 |
| Days away from work or restricted activity | 18 |
| No lost time, or an occupational illness | 8 |
What the accident reports at mines in Larimer County, Colorado describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handtools (nonpowered) | 9 |
| Machinery | 6 |
| Handling of materials | 5 |
| Slip or fall of person | 3 |
| Disorders (repeated trauma) | 2 |
| Other | 1 |
| Powered haulage | 1 |
Equipment named in accident reports at mines in Larimer County, Colorado
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 9 |
| Dimension stone machinery | 4 |
| Hand tools (powered) | 2 |
| Ore haulage trucks - on highway trucks | 2 |
| Pump | 1 |
Updated November 6, 2026. Read from US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets. US government work, public domain. Counts come from the MSHA files published on November 6, 2026. An open mine is one MSHA lists as Active, Intermittent, New Mine, Temporarily Idled or NonProducing; 13,673 were open that day. Citations, penalties, inspections and accident reports run from January 1, 2022. A citation is an inspector's allegation and an operator can contest it; the penalty is the amount MSHA first proposed, before any contest or settlement. An operator is the legal entity MSHA assesses, and a parent company is its controller. Mines run by sole proprietors or by individuals are counted in every total and are not named. This page uses MSHA data and is not endorsed or certified by MSHA. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.