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