Mining Incidents

Onyx Sterling Pit Metal/Non-Metal

Onyx Corporation · Surface
Controlled by John D Durkin
Sterling, Worcester County, MA  ·  Active
MSHA Mine ID: 1901284

Onyx Sterling Pit has $331K in proposed MSHA penalties and $308K outstanding across 1 contested dockets, plus health sampling and the full incident record.

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Fatalities
1
Total incidents
2
Years on record
2024–2026
Latest incident
Apr 2026
Compliance record
MSHA citations since 2019
65
citations
22
significant & substantial
$331,089
proposed penalties
$23,311
paid to date
7% of proposed penalties paid to date, a $307,778 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2019
21
inspections on record
767
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: 767 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

Onyx Sterling Pit has $331K in proposed MSHA penalties and $308K outstanding across 1 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.
$331K
proposed penalties
$331K
current assessed
$23K
paid to date
$308K
outstanding
59 assessments are final orders; 1 contested dockets.
As of the most recent assessment on 2025-04-02.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
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
2025 Q4 9,596 0 0 0.0
2025 Q3 8,483 0 0 0.0
2025 Q2 7,559 1 0 132.3
2025 Q1 8,023 5 5 623.2
2024 Q4 8,470 2 0 236.1
2024 Q3 9,467 17 8 1795.7
2024 Q2 9,200 3 1 326.1
2024 Q1 9,020 6 1 665.2
Show 19 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q4 6,242 0 0 0.0
2023 Q3 7,740 0 0 0.0
2023 Q2 7,060 5 0 708.2
2023 Q1 6,712 4 1 595.9
2022 Q4 5,968 0 0 0.0
2022 Q3 5,702 0 0 0.0
2022 Q2 5,704 2 0 350.6
2022 Q1 1,484 2 0 1347.7
2021 Q4 2,690 0 0 0.0
2021 Q3 2,516 0 0 0.0
2021 Q2 2,157 0 0 0.0
2021 Q1 1,942 9 4 4634.4
2020 Q4 4,455 0 0 0.0
2020 Q3 4,325 6 1 1387.3
2020 Q2 4,545 0 0 0.0
2020 Q1 4,465 0 0 0.0
2019 Q4 3,939 0 0 0.0
2019 Q3 4,506 0 0 0.0
2019 Q2 3,280 3 1 914.6

Fatalities at this mine

1 recorded
August 22, 2024 MA · Metal/Non-Metal rotary bucket excavator operator Fatality · FALL OF FACE/RIB/PILLAR/SIDE/HIGHWALL
Onyx Corporation · Caught in, under or between collapsing material or buildings

A miner died when a highwall collapsed on the excavator the miner was operating.

Reportable incidents

1 on file (excluding fatalities above)

2026 · 1 incident

April 6, 2026 MA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman SLIP OR FALL OF PERSON
Onyx Corporation · Over-exertion (Not Elsewhere Classified)

EE had a knee injury that was exacerbated as EE was walking through the garage after putting oil canisters away in a conex box behind the garage. EE felt a tweak in EE's left knee as EE stepped. On Wednesday 4/8/26 at approx 1PM, this injury was reported to have happened at work, and that it originated while shoveling one month prior near the scalper screen.

For insurers, brokers, and safety consultants

The full compliance file on Onyx Sterling Pit

A dated report covering the 26-year penalty trail, line-item violation pattern, contest and docket posture, rate-normalized peer benchmark, and full fatality history. Delivered as a PDF with the underlying data as CSV.