Crooker Mine: 10 MSHA citations Metal/Non-Metal
Crooker Mine has $1K in proposed MSHA penalties and $0 outstanding across 0 contested dockets, plus health sampling and the full incident record.
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- Fatalities
- 0
- Total incidents
- 0
- Years on record
- —
- Latest incident
- —
Compliance record
MSHA citations since 2021
10
citations
2
significant & substantial
$1,218
proposed penalties
$1,218
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2021
14
inspections on record
344
inspection hours
n/a
citations per 100 inspection hours
ⓘ
This rate is recorded citations divided by MSHA inspection hours, per 100 hours. It reflects inspection effort, not mine size or production.Rate withheld: 344 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Crooker Mine has $1K in proposed MSHA penalties and $0 outstanding across 0 contested dockets.
Penalty disposition
ⓘ
Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.$1K
proposed penalties
$1K
current assessed
$1K
paid to date
$0
outstanding
9 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2024-06-04.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Violation severity profile
ⓘ
Shares are computed over citations that carry the MSHA gravity and negligence coding; a small share of records are uncoded.20.0%
significant & substantial
10.0%
high negligence or reckless
20.0%
reasonably likely or greater
40.0%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 20.0% low, 70.0% moderate, 10.0% high, 0.0% reckless.
Source: MSHA violations gravity and negligence coding, updated weekly.
Health sampling
ⓘ
A sample is a point in time compliance measurement, not an individual exposure history. These figures describe MSHA sampling records and do not establish causation or personal dose.Metal and nonmetal contaminants (personal samples)
ⓘ
Many samples are screening measurements of substances with no applicable exposure limit; they are counted as samples but excluded from every over-limit figure. Over-limit shares use only limit-tested samples.
Last sampled: 2026-06-12
ⓘ
Many samples are screening measurements of substances with no applicable exposure limit; they are counted as samples but excluded from every over-limit figure. Over-limit shares use only limit-tested samples.14%
of limit-tested samples over the exposure limit
12
samples
7
limit-tested
Most sampled contaminants
- Diesel particulate (total carbon)71 over
- Respirable dust, <.1mg4
- Unlisted Particulate, respirable, <1% Qtz1
Show the individual readings (33)
| Date | Contaminant | Concentration | Limit | Conc / limit | Occupation |
|---|---|---|---|---|---|
| 2022-08-09 | TC @ 160 | 240 | 160 | 1.50 | Backhoe Operator |
| 2026-06-12 | Respirable dust, <.1mg | 0 | Utility Man | ||
| 2026-06-11 | ORGANIC CARBON | 95 | Drill Oper., Jackleg/Stoper | ||
| 2026-06-11 | TC @ 160 | 104 | 160 | 0.65 | Drill Oper., Jackleg/Stoper |
| 2026-06-11 | EC @ 160 | 0 | 160 | 0.00 | Drill Oper., Jackleg/Stoper |
| 2026-06-11 | TC from EC @ 160 | 0 | 160 | 0.00 | Drill Oper., Jackleg/Stoper |
| 2025-08-05 | ORGANIC CARBON | 0 | Bobcat Operator | ||
| 2025-08-05 | TC @ 160 | 0 | 160 | 0.00 | Bobcat Operator |
| 2025-08-05 | EC @ 160 | 0 | 160 | 0.00 | Bobcat Operator |
| 2025-08-05 | TC from EC @ 160 | 0 | 160 | 0.00 | Bobcat Operator |
| 2025-05-29 | Respirable dust, <.1mg | 0 | Laborer, Bullgang | ||
| 2024-10-04 | TC @ 160 | 63 | 160 | 0.39 | Utility Man |
| 2024-10-04 | ORGANIC CARBON | 0 | Utility Man | ||
| 2024-10-04 | TC from EC @ 160 | 0 | 160 | 0.00 | Utility Man |
| 2024-10-04 | EC @ 160 | 54 | 160 | 0.34 | Utility Man |
| 2024-06-05 | TC @ 160 | 116 | 160 | 0.73 | Utility Man |
| 2024-06-05 | TC from EC @ 160 | 0 | 160 | 0.00 | Utility Man |
| 2024-06-05 | EC @ 160 | 40 | 160 | 0.25 | Utility Man |
| 2024-06-05 | ORGANIC CARBON | 76 | Utility Man | ||
| 2024-06-05 | Respirable dust, <.1mg | 0 | Utility Man | ||
| 2023-10-24 | ORGANIC CARBON | 0 | Front-end Loader Operator | ||
| 2023-10-24 | TC @ 160 | 0 | 160 | 0.00 | Front-end Loader Operator |
| 2023-10-24 | EC @ 160 | 0 | 160 | 0.00 | Front-end Loader Operator |
| 2023-10-24 | TC from EC @ 160 | 0 | 160 | 0.00 | Front-end Loader Operator |
| 2023-06-14 | Respirable dust, <.1mg | 0 | Utility Man | ||
| 2023-06-07 | EC @ 160 | 0 | 160 | 0.00 | Utility Man |
| 2023-06-07 | ORGANIC CARBON | 0 | Utility Man | ||
| 2023-06-07 | TC @ 160 | 0 | 160 | 0.00 | Utility Man |
| 2023-06-07 | TC from EC @ 160 | 0 | 160 | 0.00 | Utility Man |
| 2022-08-09 | TC from EC @ 160 | 0 | 160 | 0.00 | Backhoe Operator |
| 2022-08-09 | ORGANIC CARBON | 133 | Backhoe Operator | ||
| 2022-08-09 | EC @ 160 | 107 | 160 | 0.67 | Backhoe Operator |
| 2021-11-04 | Unlisted Particulate, respirable, <1% Qtz | 0.27 | Drill Oper., Jackleg/Stoper |
Area samples (mill and shop air)
Last sampled: 2026-06-118
samples
Show the individual readings (16)
| Date | Contaminant | Concentration | Limit | Conc / limit | Area sampled |
|---|---|---|---|---|---|
| 2026-06-11 | TC @ 160 | 0 | UG TRAVEL/HAULAGE | ||
| 2026-06-11 | EC @ 160 | 0 | UG TRAVEL/HAULAGE | ||
| 2025-08-05 | TC @ 160 | 0 | UG TRAVEL/HAULAGE | ||
| 2025-08-05 | EC @ 160 | 0 | UG TRAVEL/HAULAGE | ||
| 2024-10-04 | EC @ 160 | 0 | UG ACTIVE MINING | ||
| 2024-10-04 | TC @ 160 | 0 | UG ACTIVE MINING | ||
| 2024-06-05 | EC @ 160 | 0 | UG ACTIVE MINING | ||
| 2024-06-05 | TC @ 160 | 0 | UG ACTIVE MINING | ||
| 2023-10-24 | TC @ 160 | 0 | UG ACTIVE MINING | ||
| 2023-10-24 | EC @ 160 | 0 | UG ACTIVE MINING | ||
| 2023-10-24 | TC @ 160 | 0 | UG ACTIVE MINING | ||
| 2023-10-24 | EC @ 160 | 0 | UG ACTIVE MINING | ||
| 2023-06-07 | TC @ 160 | 0 | UG ACTIVE MINING | ||
| 2023-06-07 | EC @ 160 | 0 | UG ACTIVE MINING | ||
| 2022-08-09 | EC @ 160 | 0 | UG ACTIVE MINING | ||
| 2022-08-09 | TC @ 160 | 43 | UG ACTIVE MINING |
Source: MSHA respirable dust, quartz, and noise sampling records, updated weekly. Metal/nonmetal contaminant figures come from MSHA's Personal Health Samples and Area Samples files (public record), updated weekly.
Ownership history
- Coromoto Minerals LLC 2021 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
| Year | Employees |
|---|---|
| 2026 | 4 |
| 2025 | 4 |
| 2024 | 3 |
| 2023 | 3 |
| 2022 | 3 |
| 2021 | 4 |
Source: MSHA quarterly employment and production, updated weekly.
Crooker Mine sits in Oxford County, Maine, where the Census mining category is 0.1% of county employment.
Local economic context
ⓘ
County figures come from the US Census Bureau's American Community Survey, 5-year pooled estimates, so the 2023 vintage covers 2019 through 2023. The Census category is 'mining, quarrying, and oil and gas extraction', which is broader than MSHA jurisdiction and includes oil and gas workers no mine employs. These figures describe the surrounding county, not this mine, and are not a factor in any specific incident.Oxford County, Maine · Population 58,728
0.1%
Mining share of county employment
$57,933
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.
Quarterly safety rates
ⓘ
Citations per million reported employee-hours. Rates begin in 2000, when MSHA's quarterly employment data starts; earlier incidents are counted but cannot be rate-adjusted. Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.Citations per million employee-hours, as reported to MSHA
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2026 Q2 | 483 | 1 | 1 | 2070.4 |
| 2025 Q4 | 416 | 0 | 0 | 0.0 |
| 2025 Q3 | 820 | 0 | 0 | 0.0 |
| 2025 Q2 | 585 | 0 | 0 | 0.0 |
| 2024 Q4 | 441 | 0 | 0 | 0.0 |
| 2024 Q3 | 773 | 0 | 0 | 0.0 |
| 2024 Q2 | 585 | 1 | 0 | 1709.4 |
| 2024 Q1 | 0 | 0 | 0 |
Show 9 earlier quarters Hide earlier quarters
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2023 Q4 | 407 | 1 | 0 | 2457.0 |
| 2023 Q3 | 509 | 0 | 0 | 0.0 |
| 2023 Q2 | 280 | 1 | 0 | 3571.4 |
| 2023 Q1 | 0 | 0 | 0 | |
| 2022 Q4 | 459 | 1 | 0 | 2178.6 |
| 2022 Q3 | 836 | 1 | 0 | 1196.2 |
| 2022 Q2 | 592 | 1 | 1 | 1689.2 |
| 2022 Q1 | 0 | 0 | 0 | |
| 2021 Q4 | 541 | 3 | 0 | 5545.3 |
No reportable incidents on file.
MSHA has no recorded reportable accidents for this mine in the current dataset. New reports appear here within a week of being filed.