Data / Mines / Maine / Nonmetal mines
Nonmetal mineral mines in Maine: 9 open mines
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
MSHA lists 9 open nonmetal mineral mines in Maine, run by 5 operators and employing 29 people. Since January 1, 2022 its inspectors issued 30 citations and orders there with $4,372 in proposed penalties, and operators reported no injury or illness cases. The operators with the most open mines are Ed Pelletier & Sons Co; Coromoto Minerals LLC; Oquossoc Shale & Gravel LLC. Data from MSHA, November 6, 2026.
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- Open mines
- 9
- Operators
- 5
- Employees
- 29
- Intermittent
- 7
- Temporarily Idled
- 1
- Active
- 1
- Mines run by individuals, counted and not listed
- 1
- Citations and orders since January 1, 2022
- 30
- Significant and substantial
- 3 (10.0%)
- Closure orders
- 0
- High negligence or reckless
- 1
- Proposed penalties
- $4,372
- Amount paid so far
- $4,372
- Inspections
- 39
- Inspector hours on site
- 282
- Citations per inspection
- 0.77 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- October 29, 2026
Operators with the most open mines in Maine
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 |
|---|---|---|---|---|---|
| Ed Pelletier & Sons Co | 4 | 20 | 2 | $0 | 0 |
| Coromoto Minerals LLC | 2 | 4 | 14 | $2,230 | 0 |
| Oquossoc Shale & Gravel LLC | 1 | 2 | 4 | $819 | 0 |
| Colton Hill Mining LLC | 1 | 1 | 0 | $0 | 0 |
Operators with the most citations in Maine
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Coromoto Minerals LLC | 2 | 4 | 14 | $2,230 | 0 |
| Oquossoc Shale & Gravel LLC | 1 | 2 | 4 | $819 | 0 |
| Ed Pelletier & Sons Co | 4 | 20 | 2 | $0 | 0 |
| Colton Hill Mining LLC | 1 | 1 | 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 |
|---|---|---|---|---|---|
| Mount Mica | Coromoto Minerals LLC | Oxford County, ME | Gemstones | 2 | 8 |
| Crooker Mine | Coromoto Minerals LLC | Oxford County, ME | Gemstones | 2 | 6 |
| Oquossoc Shale & Gravel | Oquossoc Shale & Gravel LLC | Franklin County, ME | Common shale | 2 | 4 |
| Frenchville Quarry | Ed Pelletier & Sons Co | Aroostook County, ME | Common shale | 5 | 2 |
| Daigle Quarry | Ed Pelletier & Sons Co | Aroostook County, ME | Common shale | 5 | 0 |
| Van Buren Quarry | Ed Pelletier & Sons Co | Aroostook County, ME | Common shale | 5 | 0 |
| Presque Isle Quarry | Ed Pelletier & Sons Co | Aroostook County, ME | Common shale | 5 | 0 |
| Colton Hill | Colton Hill Mining LLC | Oxford County, ME | Gemstones | 1 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Common shale | 5 | 55.6% |
| Gemstones | 3 | 33.3% |
| Sand, industrial | 1 | 11.1% |
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 | 4 | 1 | $543 | 0 |
| 2023 | 10 | 1 | $1,663 | 0 |
| 2024 | 3 | 0 | $441 | 0 |
| 2025 | 9 | 1 | $1,574 | 0 |
| 2026 | 4 | 0 | $151 | 0 |
Standards cited most at nonmetal mineral mines in Maine
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 | 8 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 3 |
| 30 CFR 57.14206 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.5002 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.18025 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.18013 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.8520 | Underground metal and nonmetal mines | 1 |
| 30 CFR 56.18010 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12019 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12030 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.11003 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 1 |
| 30 CFR 57.4361 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.14132 | Underground metal and nonmetal mines | 1 |
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.