Data / Mines / Arizona / Coconino County
Mines in Coconino County, Arizona: 28 open mines
MSHA lists 28 open mines in Coconino County, Arizona, run by 24 operators and employing 218 people. Since January 1, 2022 its inspectors issued 269 citations and orders there with $60,597 in proposed penalties, and operators reported 12 injury or illness cases. The operators with the most open mines are Dunbar Stone Company Inc; Interstate Rock Products Inc; Drake Stone Products Inc. Data from MSHA, November 6, 2026.
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- Open mines
- 28
- Operators
- 24
- Employees
- 218
- Intermittent
- 14
- Active
- 12
- Temporarily Idled
- 2
- Mines run by individuals, counted and not listed
- 5
- Citations and orders since January 1, 2022
- 269
- Significant and substantial
- 34 (12.6%)
- Closure orders
- 10
- High negligence or reckless
- 34
- Proposed penalties
- $60,597
- Amount paid so far
- $59,540
- Inspections
- 207
- Inspector hours on site
- 1,530
- Citations per inspection
- 1.30 (all mines 2.30)
- Accident reports
- 12
- Injury and illness cases
- 12
- Fatalities
- 0
- Latest MSHA record
- October 28, 2026
Operators with the most open mines in Coconino County, Arizona
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 |
|---|---|---|---|---|---|
| Dunbar Stone Company Inc | 3 | 6 | 0 | $0 | 0 |
| Interstate Rock Products Inc | 2 | 4 | 15 | $2,108 | 0 |
| Drake Stone Products Inc | 2 | 7 | 3 | $453 | 0 |
| Martin Marietta Materials, Inc. | 1 | 84 | 67 | $13,786 | 4 |
| Efr Arizona Strip LLC | 1 | 32 | 42 | $6,637 | 7 |
| Miller Mining, Inc. | 1 | 2 | 30 | $16,489 | 0 |
| Red Pit Mine | 1 | 6 | 18 | $3,009 | 0 |
| More Sand LLC | 1 | 2 | 15 | $2,021 | 0 |
| Cemex Construction Materials South LLC | 1 | 15 | 9 | $1,664 | 0 |
| Restoration Group, Inc. | 1 | 7 | 8 | $1,446 | 1 |
| Harley Gray Stone Company | 1 | 8 | 5 | $869 | 0 |
| Howard Mesa Materials L.L.C. | 1 | 2 | 5 | $957 | 0 |
| Coconino County Public Works Dept | 1 | 8 | 4 | $582 | 0 |
| Kanab Coal and Rock Products | 1 | 1 | 3 | $0 | 0 |
| Schuck Development Corp | 1 | 4 | 3 | $319 | 0 |
| L.P.'s Cinder Pitt, LLC | 1 | 2 | 2 | $527 | 0 |
| The Landscape Connection Commercial Supply Yard | 1 | 7 | 1 | $151 | 0 |
| Drake Cement LLC | 1 | 4 | 0 | $0 | 0 |
| Howard Gray Stone | 1 | 5 | 0 | $0 | 0 |
Operators with the most citations in Coconino County, Arizona
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Martin Marietta Materials, Inc. | 1 | 84 | 67 | $13,786 | 4 |
| Efr Arizona Strip LLC | 1 | 32 | 42 | $6,637 | 7 |
| Miller Mining, Inc. | 1 | 2 | 30 | $16,489 | 0 |
| Red Pit Mine | 1 | 6 | 18 | $3,009 | 0 |
| Interstate Rock Products Inc | 2 | 4 | 15 | $2,108 | 0 |
| More Sand LLC | 1 | 2 | 15 | $2,021 | 0 |
| Cemex Construction Materials South LLC | 1 | 15 | 9 | $1,664 | 0 |
| Restoration Group, Inc. | 1 | 7 | 8 | $1,446 | 1 |
| Harley Gray Stone Company | 1 | 8 | 5 | $869 | 0 |
| Howard Mesa Materials L.L.C. | 1 | 2 | 5 | $957 | 0 |
| Coconino County Public Works Dept | 1 | 8 | 4 | $582 | 0 |
| Drake Stone Products Inc | 2 | 7 | 3 | $453 | 0 |
| Kanab Coal and Rock Products | 1 | 1 | 3 | $0 | 0 |
| Schuck Development Corp | 1 | 4 | 3 | $319 | 0 |
| L.P.'s Cinder Pitt, LLC | 1 | 2 | 2 | $527 | 0 |
| The Landscape Connection Commercial Supply Yard | 1 | 7 | 1 | $151 | 0 |
| Dunbar Stone Company Inc | 3 | 6 | 0 | $0 | 0 |
| Drake Cement LLC | 1 | 4 | 0 | $0 | 0 |
| Howard Gray Stone | 1 | 5 | 0 | $0 | 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 |
|---|---|---|---|---|---|
| Nelson Quarry & Plant | Martin Marietta Materials, Inc. | Coconino County, AZ | Lime | 84 | 67 |
| Pinyon Plain Mine | Efr Arizona Strip LLC | Coconino County, AZ | Uranium ore | 32 | 42 |
| Miller Mine | Miller Mining, Inc. | Coconino County, AZ | Crushed, broken stone | 2 | 30 |
| Red Pit Mine | Red Pit Mine | Coconino County, AZ | Crushed, broken stone | 6 | 18 |
| More Sand | More Sand LLC | Coconino County, AZ | Construction sand and gravel | 2 | 15 |
| Wash Plant | Interstate Rock Products Inc | Coconino County, AZ | Crushed, broken stone | 2 | 13 |
| Cemex-Gray Mountain | Cemex Construction Materials South LLC | Coconino County, AZ | Construction sand and gravel | 15 | 9 |
| Crusher #1 | Restoration Group, Inc. | Coconino County, AZ | Construction sand and gravel | 7 | 8 |
| Partridge T23N R3W &27 | Harley Gray Stone Company | Coconino County, AZ | Dimension sandstone | 8 | 5 |
| Howard Mason Materials | Howard Mesa Materials L.L.C. | Coconino County, AZ | Crushed, broken stone | 2 | 5 |
| Portable Screen All | Coconino County Public Works Dept | Coconino County, AZ | Construction sand and gravel | 8 | 4 |
| Schuck Development Corp | Schuck Development Corp | Coconino County, AZ | Construction sand and gravel | 4 | 3 |
| Diamond 7 | Drake Stone Products Inc | Coconino County, AZ | Dimension sandstone | 3 | 3 |
| Kaibab Pit | Kanab Coal and Rock Products | Coconino County, AZ | Construction sand and gravel | 1 | 3 |
| L.P.'s Cinder Pitt, LLC | L.P.'s Cinder Pitt, LLC | Coconino County, AZ | Crushed, broken stone | 2 | 2 |
| Fredonia Portable | Interstate Rock Products Inc | Coconino County, AZ | Construction sand and gravel | 2 | 2 |
| Sheep Hill Cinder Mine | The Landscape Connection Commercial Supply Yard | Coconino County, AZ | Crushed, broken stone | 7 | 1 |
| Million $ Buff Grindstone Canyon | Howard Gray Stone | Coconino County, AZ | Construction sand and gravel | 5 | 0 |
| Diamond 7 Oak | Drake Stone Products Inc | Coconino County, AZ | Dimension sandstone | 4 | 0 |
| Frenchy Hill | Drake Cement LLC | Coconino County, AZ | Construction sand and gravel | 4 | 0 |
| Roeder Et All | Dunbar Stone Company Inc | Coconino County, AZ | Crushed, broken stone | 3 | 0 |
| Hilltop and Corva | Dunbar Stone Company Inc | Coconino County, AZ | Dimension sandstone | 3 | 0 |
| Yellow Buck Matterhorn & Buckskin | Dunbar Stone Company Inc | Coconino County, AZ | Dimension stone | 0 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 9 | 32.1% |
| Crushed, broken stone | 8 | 28.6% |
| Dimension sandstone | 5 | 17.9% |
| Dimension stone | 3 | 10.7% |
| Misc. metal ore | 1 | 3.6% |
| Lime | 1 | 3.6% |
| Uranium ore | 1 | 3.6% |
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 | 66 | 5 | $12,544 | 0 |
| 2023 | 39 | 9 | $11,245 | 6 |
| 2024 | 54 | 4 | $16,292 | 1 |
| 2025 | 52 | 11 | $13,661 | 2 |
| 2026 | 58 | 5 | $6,855 | 3 |
Standards cited most at mines in Coconino County, Arizona
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 | 28 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 15 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 10 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.4104 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 6 |
| 30 CFR 47.41 | Hazard communication | 6 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.12002 | Surface metal and nonmetal mines | 5 |
| 30 CFR 46.5 | Training at sand, gravel and surface stone mines | 5 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 5 |
Injury and illness cases at mines in Coconino County, Arizona
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 | 5 |
| No lost time, or an occupational illness | 6 |
What the accident reports at mines in Coconino County, Arizona describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 3 |
| Machinery | 3 |
| Handtools (nonpowered) | 2 |
| Slip or fall of person | 2 |
| Powered haulage | 1 |
| Fall of roof or back | 1 |
Equipment named in accident reports at mines in Coconino County, Arizona
| Equipment | Reports |
|---|---|
| Rock drill | 3 |
| Hand tools (not powered) | 2 |
| Conveyor | 1 |
| Crusher | 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.