Data / Mines / Colorado / Spec Agg Quarry
Spec Agg Quarry: 16 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Spec Agg Quarry is an active crushed, broken sandstone surface mine in Jefferson County, Colorado, operated by Martin Marietta Materials, Inc. with 32 employees on MSHA's record (mine ID 0500860). Since January 1, 2022 MSHA inspectors issued 16 citations and orders there with $4,094 in proposed penalties, and 6 accident reports were filed there, with 6 injury or illness cases.
The request: Watch Spec Agg Quarry (MSHA mine ID 0500860) in Jefferson County, Colorado: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0500860
- Status
- Active since October 5, 2011
- Main commodity
- Crushed, broken sandstone
- Mine type
- Surface
- County
- Jefferson County, Colorado
- Nearest town
- Golden
- Operator
- Martin Marietta Materials, Inc.
- Parent company
- Martin Marietta Materials Inc
- Employees
- 32
- MSHA field office
- Denver CO Field Office
- Citations and orders since January 1, 2022
- 16
- Significant and substantial
- 2 (12.5%)
- Closure orders
- 0
- High negligence or reckless
- 2
- Proposed penalties
- $4,094
- Amount paid so far
- $4,094
- Inspections
- 30
- Inspector hours on site
- 218
- Citations per inspection
- 0.53 (all mines 2.30)
- Accident reports
- 6
- Injury and illness cases
- 6
- Fatalities
- 0
- Latest MSHA record
- August 17, 2026
- Citations issued to contractors here
- 2 ($1,367 proposed)
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 | 1 | 1 | $1,358 | 0 |
| 2023 | 4 | 0 | $750 | 3 |
| 2024 | 4 | 0 | $680 | 2 |
| 2025 | 4 | 0 | $819 | 1 |
| 2026 | 3 | 1 | $487 | 0 |
Standards cited most at Spec Agg Quarry
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 56.12004 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12025 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 1 |
| 30 CFR 47.41 | Hazard communication | 1 |
| 30 CFR 56.4104 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14115 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 1 |
| 30 CFR 46.12 | Training at sand, gravel and surface stone mines | 1 |
| 30 CFR 46.11 | Training at sand, gravel and surface stone mines | 1 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 1 |
Injury and illness cases at Spec Agg Quarry
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 4 |
| No lost time, or an occupational illness | 2 |
What the accident reports at Spec Agg Quarry describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Powered haulage | 3 |
| Handling of materials | 1 |
| Handtools (nonpowered) | 1 |
| Slip or fall of person | 1 |
Equipment named in accident reports at Spec Agg Quarry
| Equipment | Reports |
|---|---|
| Ore haulage trucks - off highway trucks | 1 |
| Conveyor | 1 |
| Hand tools (not powered) | 1 |
| Front-end loader | 1 |
Other open mines in Jefferson County, Colorado
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Arcosa Boulder Plant #1604 | Arcosa LWB, LLC | Jefferson County, CO | Common shale | 10 | 176 |
| Jeffco Gravel Mine | Burnco | Jefferson County, CO | Construction sand and gravel | 9 | 43 |
| Ralston Quarry | Oldcastle SW Group, Inc. | Jefferson County, CO | Crushed, broken stone | 17 | 35 |
| Church Harvey Mine | Cmt Excavating Inc | Jefferson County, CO | Common clays | 5 | 21 |
| WP 3 | Oldcastle SW Group, Inc. | Jefferson County, CO | Construction sand and gravel | 1 | 6 |
| Denver Plant 60 Clay Mines | General Shale Brick, Inc. | Jefferson County, CO | Clay, ceramic, refractory mnls. | 1 | 0 |
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.