Data / Mines / Colorado / Fremont County
Mines in Fremont County, Colorado: 18 open mines
MSHA lists 18 open mines in Fremont County, Colorado, run by 9 operators and employing 268 people. Since January 1, 2022 its inspectors issued 853 citations and orders there with $2,847,602 in proposed penalties, and operators reported 23 injury or illness cases. The operators with the most open mines are Martin Marietta Materials, Inc.; Langston Concrete Inc.; Oldcastle SW Group, Inc.. Data from MSHA, November 6, 2026.
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- Open mines
- 18
- Operators
- 9
- Employees
- 268
- Active
- 12
- Intermittent
- 6
- Mines run by individuals, counted and not listed
- 6
- Citations and orders since January 1, 2022
- 853
- Significant and substantial
- 141 (16.5%)
- Closure orders
- 9
- High negligence or reckless
- 96
- Proposed penalties
- $2,847,602
- Amount paid so far
- $2,261,504
- Inspections
- 195
- Inspector hours on site
- 2,609
- Citations per inspection
- 4.37 (all mines 2.30)
- Accident reports
- 24
- Injury and illness cases
- 23
- Fatalities
- 0
- Latest MSHA record
- October 26, 2026
Operators with the most open mines in Fremont 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 |
|---|---|---|---|---|---|
| Martin Marietta Materials, Inc. | 2 | 21 | 35 | $7,804 | 0 |
| Langston Concrete Inc. | 2 | 12 | 21 | $3,206 | 0 |
| Oldcastle SW Group, Inc. | 2 | 8 | 21 | $2,441 | 0 |
| Super Ex., LLC | 2 | 7 | 9 | $1,009 | 0 |
| Holcim (US) Incorporated | 1 | 175 | 644 | $2,798,618 | 21 |
| Colorado Quarries Inc | 1 | 2 | 25 | $8,294 | 0 |
| Yevoli Cobblestone Inc | 1 | 1 | 17 | $2,875 | 0 |
| Rocky Mountain Landscape Materials, LLC | 1 | 2 | 3 | $651 | 0 |
Operators with the most citations in Fremont 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 |
|---|---|---|---|---|---|
| Holcim (US) Incorporated | 1 | 175 | 644 | $2,798,618 | 21 |
| Martin Marietta Materials, Inc. | 2 | 21 | 35 | $7,804 | 0 |
| Colorado Quarries Inc | 1 | 2 | 25 | $8,294 | 0 |
| Langston Concrete Inc. | 2 | 12 | 21 | $3,206 | 0 |
| Oldcastle SW Group, Inc. | 2 | 8 | 21 | $2,441 | 0 |
| Yevoli Cobblestone Inc | 1 | 1 | 17 | $2,875 | 0 |
| Super Ex., LLC | 2 | 7 | 9 | $1,009 | 0 |
| Rocky Mountain Landscape Materials, LLC | 1 | 2 | 3 | $651 | 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 |
|---|---|---|---|---|---|
| Amrize Portland Plant | Holcim (US) Incorporated | Fremont County, CO | Cement | 175 | 644 |
| Portable Unit #1 | Colorado Quarries Inc | Fremont County, CO | Crushed, broken stone | 2 | 25 |
| Red Canyon Quarry | Martin Marietta Materials, Inc. | Fremont County, CO | Crushed, broken stone | 10 | 23 |
| Yevoli Cobblestone Pit | Yevoli Cobblestone Inc | Fremont County, CO | Construction sand and gravel | 1 | 17 |
| Langston Concrete Inc. | Langston Concrete Inc. | Fremont County, CO | Construction sand and gravel | 6 | 14 |
| Wash Plant 2 | Oldcastle SW Group, Inc. | Fremont County, CO | Construction sand and gravel | 2 | 13 |
| Penrose Ranch Gravel Pit | Martin Marietta Materials, Inc. | Fremont County, CO | Construction sand and gravel | 11 | 12 |
| Portable Crusher #6 | Oldcastle SW Group, Inc. | Fremont County, CO | Construction sand and gravel | 6 | 8 |
| Portable Unit Extec | Super Ex., LLC | Fremont County, CO | Construction sand and gravel | 3 | 8 |
| Portable | Langston Concrete Inc. | Fremont County, CO | Construction sand and gravel | 6 | 7 |
| Kleemann Ms15z-Ad | Rocky Mountain Landscape Materials, LLC | Fremont County, CO | Construction sand and gravel | 2 | 3 |
| Portable Unit Eljay1140 | Super Ex., LLC | Fremont County, CO | Construction sand and gravel | 4 | 1 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 11 | 61.1% |
| Crushed, broken stone | 5 | 27.8% |
| Cement | 1 | 5.6% |
| Dimension sandstone | 1 | 5.6% |
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 | 210 | 35 | $760,832 | 4 |
| 2023 | 227 | 26 | $1,250,243 | 4 |
| 2024 | 147 | 26 | $317,033 | 4 |
| 2025 | 177 | 40 | $470,431 | 7 |
| 2026 | 92 | 14 | $49,063 | 4 |
Standards cited most at mines in Fremont 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 56.20003 | Surface metal and nonmetal mines | 122 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 79 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 68 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 64 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 38 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 29 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 26 |
| 30 CFR 47.41 | Hazard communication | 26 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 23 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 22 |
| 30 CFR 56.16005 | Surface metal and nonmetal mines | 21 |
| 30 CFR 56.4101 | Surface metal and nonmetal mines | 19 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 18 |
| 30 CFR 56.13021 | Surface metal and nonmetal mines | 17 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 15 |
Injury and illness cases at mines in Fremont County, Colorado
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 12 |
| No lost time, or an occupational illness | 11 |
What the accident reports at mines in Fremont County, Colorado describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 9 |
| Slip or fall of person | 7 |
| Machinery | 3 |
| Other | 2 |
| Handtools (nonpowered) | 1 |
| Entrapment | 1 |
| All other occupational illnesses | 1 |
Equipment named in accident reports at mines in Fremont County, Colorado
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 3 |
| Bench grinder | 1 |
| Elevator | 1 |
| Crusher | 1 |
| Hand tools (powered) | 1 |
| Screen | 1 |
| Front-end loader | 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.