Data / Mines / Maine / Portable Plant
Portable Plant, Knox County, Maine: 13 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Portable Plant is an active construction sand and gravel surface mine in Knox County, Maine, operated by Arc Aggregates LLC with 4 employees on MSHA's record (mine ID 1701093). Since January 1, 2022 MSHA inspectors issued 13 citations and orders there with $2,413 in proposed penalties, and 0 accident reports were filed there, with no injury or illness cases.
The request: Watch Portable Plant (MSHA mine ID 1701093) in Knox County, Maine: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 1701093
- Status
- Active since November 20, 2024
- Main commodity
- Construction sand and gravel
- Mine type
- Surface
- County
- Knox County, Maine
- Nearest town
- Warren
- Operator
- Arc Aggregates LLC
- Employees
- 4
- MSHA field office
- Portsmouth NH Field Office
- Citations and orders since January 1, 2022
- 13
- Significant and substantial
- 4 (30.8%)
- Closure orders
- 0
- High negligence or reckless
- 0
- Proposed penalties
- $2,413
- Amount paid so far
- $2,413
- Inspections
- 6
- Inspector hours on site
- 44
- Citations per inspection
- 2.17 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- June 29, 2026
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 |
|---|---|---|---|---|
| 2023 | 4 | 0 | $572 | 0 |
| 2024 | 3 | 0 | $441 | 0 |
| 2025 | 3 | 2 | $700 | 0 |
| 2026 | 3 | 2 | $700 | 0 |
Standards cited most at Portable Plant
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 56.11001 | Surface metal and nonmetal mines | 3 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 2 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.15020 | Surface metal and nonmetal mines | 1 |
| 30 CFR 41.20 | Notice of legal identity | 1 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 1 |
| 30 CFR 46.9 | Training at sand, gravel and surface stone mines | 1 |
| 30 CFR 56.3131 | Surface metal and nonmetal mines | 1 |
Other open mines in Knox County, Maine
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Portable Pioneer Plant | Ferraiolo Construction Company Inc | Knox County, ME | Crushed, broken limestone | 4 | 37 |
| Hard Rock Quarry | Peter Overlock Inc | Knox County, ME | Construction sand and gravel | 3 | 37 |
| Pease Pit | Jake Barbour, Inc. | Knox County, ME | Construction sand and gravel | 0 | 15 |
| Cushing Pit | Meklin Excavation | Knox County, ME | Construction sand and gravel | 2 | 9 |
| Washington Pit #2 | Jake Barbour, Inc. | Knox County, ME | Construction sand and gravel | 1 | 9 |
| Mills Excavation Inc. | Mills Excavation, Inc. | Knox County, ME | Crushed, broken stone | 1 | 9 |
| Thomaston Pit | Meklin Excavation | Knox County, ME | Construction sand and gravel | 2 | 8 |
| Astec Gt165df Mobile Screening Plant | Jake Barbour, Inc. | Knox County, ME | Construction sand and gravel | 3 | 7 |
| 341 Rock Quarry | Wilson Construction & Landscaping Inc | Knox County, ME | Crushed, broken stone | 4 | 6 |
| Astec GT165 | Jake Barbour, Inc. | Knox County, ME | Construction sand and gravel | 2 | 5 |
| Powerscreen Premiertrak 400X | Jake Barbour, Inc. | Knox County, ME | Construction sand and gravel | 3 | 4 |
| Cedarapids Crc1150s | Jake Barbour, Inc. | Knox County, ME | Construction sand and gravel | 3 | 3 |
| Pioneer Jaw Crusher & Metso Cone Crusher | Jake Barbour, Inc. | Knox County, ME | Construction sand and gravel | 2 | 3 |
| Pike Washington | Pike Industries | Knox County, ME | Construction sand and gravel | 2 | 1 |
| Quarry- 2 | Hagar Enterprises Inc | Knox County, ME | Construction sand and gravel | 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.