Cornerstone Industrial Minerals Corp · Struck by flying object
While drilling, heavy winds were blowing dust. Sealed safety goggles did not keep out all the dust.
TUCKER HILL QUARRY Metal/Non-Metal
Imerys Perlite USA, Inc.
· Surface
Controlled by
Imerys S A
Lakeview,
Lake County,
OR
·
Active
MSHA Mine ID: 3503432
TUCKER HILL QUARRY has $10K in proposed MSHA penalties and $604 outstanding across 0 contested dockets, plus health sampling and the full incident record.
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- Fatalities
- 0
- Total incidents
- 2
- Years on record
- 2015–2016
- Latest incident
- Mar 2016
Compliance record
MSHA citations since 2014
59
citations
8
significant & substantial
$10,262
proposed penalties
$9,658
paid to date
94% of proposed penalties paid to date, a $604 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
30
inspections on record
583
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: 583 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
TUCKER HILL QUARRY has $10K in proposed MSHA penalties and $604 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.$10K
proposed penalties
$10K
current assessed
$10K
paid to date
$604
outstanding
59 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-02-11.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
See also
the operator's enforcement record
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 | 2,074 | 0 | 0 | 0.0 |
| 2025 Q3 | 2,416 | 0 | 0 | 0.0 |
| 2025 Q2 | 2,465 | 2 | 0 | 811.4 |
| 2025 Q1 | 2,479 | 0 | 0 | 0.0 |
| 2024 Q4 | 2,104 | 1 | 0 | 475.3 |
| 2024 Q3 | 2,811 | 1 | 0 | 355.7 |
| 2024 Q2 | 2,816 | 0 | 0 | 0.0 |
| 2024 Q1 | 2,819 | 0 | 0 | 0.0 |
Show 41 earlier quarters Hide earlier quarters
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2023 Q4 | 1,201 | 2 | 0 | 1665.3 |
| 2023 Q3 | 1,436 | 0 | 0 | 0.0 |
| 2023 Q2 | 1,804 | 4 | 0 | 2217.3 |
| 2023 Q1 | 2,286 | 2 | 0 | 874.9 |
| 2022 Q4 | 1,680 | 0 | 0 | 0.0 |
| 2022 Q3 | 2,613 | 0 | 0 | 0.0 |
| 2022 Q2 | 3,176 | 0 | 0 | 0.0 |
| 2022 Q1 | 3,797 | 0 | 0 | 0.0 |
| 2021 Q4 | 3,494 | 0 | 0 | 0.0 |
| 2021 Q3 | 3,264 | 0 | 0 | 0.0 |
| 2021 Q2 | 3,561 | 7 | 2 | 1965.7 |
| 2021 Q1 | 2,761 | 0 | 0 | 0.0 |
| 2020 Q4 | 3,613 | 6 | 0 | 1660.7 |
| 2020 Q3 | 3,490 | 0 | 0 | 0.0 |
| 2020 Q2 | 2,552 | 6 | 1 | 2351.1 |
| 2020 Q1 | 1,958 | 4 | 0 | 2042.9 |
| 2019 Q4 | 2,621 | 0 | 0 | 0.0 |
| 2019 Q3 | 3,657 | 2 | 0 | 546.9 |
| 2019 Q2 | 2,677 | 0 | 0 | 0.0 |
| 2019 Q1 | 2,185 | 0 | 0 | 0.0 |
| 2018 Q4 | 1,981 | 2 | 0 | 1009.6 |
| 2018 Q3 | 2,666 | 0 | 0 | 0.0 |
| 2018 Q2 | 2,999 | 0 | 0 | 0.0 |
| 2018 Q1 | 3,988 | 1 | 0 | 250.8 |
| 2017 Q4 | 3,530 | 1 | 0 | 283.3 |
| 2017 Q3 | 4,993 | 0 | 0 | 0.0 |
| 2017 Q2 | 2,950 | 1 | 0 | 339.0 |
| 2017 Q1 | 2,930 | 0 | 0 | 0.0 |
| 2016 Q4 | 2,082 | 0 | 0 | 0.0 |
| 2016 Q3 | 2,619 | 0 | 0 | 0.0 |
| 2016 Q2 | 2,267 | 0 | 0 | 0.0 |
| 2016 Q1 | 2,788 | 1 | 0 | 358.7 |
| 2015 Q4 | 2,044 | 0 | 0 | 0.0 |
| 2015 Q3 | 3,259 | 0 | 0 | 0.0 |
| 2015 Q2 | 3,100 | 4 | 1 | 1290.3 |
| 2015 Q1 | 2,825 | 0 | 0 | 0.0 |
| 2014 Q4 | 2,307 | 2 | 0 | 866.9 |
| 2014 Q3 | 2,869 | 6 | 4 | 2091.3 |
| 2014 Q2 | 2,417 | 0 | 0 | 0.0 |
| 2000 Q3 | 420 | 0 | 0 | 0.0 |
| 2000 Q1 | 557 | 0 | 0 | 0.0 |
No fatalities recorded at this mine.
Reportable incidents
2 on file2016 · 1 incident
2015 · 1 incident
April 23, 2015
OR · Metal/Non-Metal
maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech
HANDLING OF MATERIALS
Cornerstone Industrial Minerals Corp · Struck by flying object
Swirling wind conditions caused dust to blow under safety glasses and into left eye. Miner missed no work but needed to get prescription.
For insurers, brokers, and safety consultants
The full compliance file on TUCKER HILL QUARRY
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.