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Onyx Sterling Pit Metal/Non-Metal

Onyx Corporation · Surface

Controlled by John D Durkin

Sterling, Worcester County, MA · Active

MSHA Mine ID: 1901284

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Email me when a new MSHA incident is filed at Onyx Sterling Pit.

Fatalities: 1
Total incidents: 2
Years on record: 2024–2026
Latest incident: Apr 2026

Compliance record

MSHA citations since 2019

citations

significant & substantial

$331,089

proposed penalties

$23,311

paid to date

Source: MSHA violations data, updated weekly.

Quarterly safety rates

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	2,228	0	0	0.0
2025 Q2	1,665	1	0	600.6
2025 Q1	6,193	5	5	807.4
2024 Q3	7,382	17	8	2302.9
2024 Q2	9,200	3	1	326.1
2023 Q4	1,850	0	0	0.0
2023 Q3	2,100	0	0	0.0

Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.

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.