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TUCKER HILL QUARRY: 63 MSHA citations Metal/Non-Metal

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
63
citations
11
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.
See Imerys Perlite USA, Inc.'s full MSHA compliance history →
Inspection activity
MSHA inspections since 2000
32
inspections on record
613
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: 613 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.
Violation severity profile
ⓘ Shares are computed over citations that carry the MSHA gravity and negligence coding; a small share of records are uncoded.
17.5%
significant & substantial
12.7%
high negligence or reckless
17.5%
reasonably likely or greater
66.7%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 4.8% low, 82.5% moderate, 12.7% 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: 2024-11-06
9
samples
0
limit-tested
Most sampled contaminants
  • Respirable dust, <.1mg4
  • Unlisted Particulate, total, <1% Qtz3
  • Cristobalite, respirable1
  • Unlisted Particulate, respirable, <1% Qtz1
Show the individual readings (9)
Date Contaminant Concentration Limit Conc / limit Occupation
2024-11-06 Unlisted Particulate, respirable, <1% Qtz 0.14 Laborer, Bullgang
2024-11-06 Cristobalite, respirable 0.14 Laborer, Bullgang
2023-10-31 Respirable dust, <.1mg 0 Truck Driver
2023-10-31 Respirable dust, <.1mg 0 Front-end Loader Operator
2021-04-30 Respirable dust, <.1mg 0 Truck Driver
2021-04-30 Respirable dust, <.1mg 0 Front-end Loader Operator
2016-07-07 Unlisted Particulate, total, <1% Qtz 0 Front-end Loader Operator
2016-07-07 Unlisted Particulate, total, <1% Qtz 0 Front-end Loader Operator
2014-11-18 Unlisted Particulate, total, <1% Qtz 0 Crusher Oper/Worker

Area samples (mill and shop air)

Last sampled: 2024-11-06
2
samples
Show the individual readings (4)
Date Contaminant Concentration Limit Conc / limit Area sampled
2024-11-06 ANALYZED BULK DUST MASS 0 SF ORE TRANSFER
2024-11-06 QUARTZ (BULK DUST) 0 SF ORE TRANSFER
2024-11-06 ANALYZED BULK DUST MASS 0 SF ORE TRANSFER
2024-11-06 QUARTZ (BULK DUST) 0 SF ORE TRANSFER
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
  1. Cornerstone Industrial Minerals Corp Usa 1996 to 1999
  2. Cornerstone Industrial Minerals Corp 1999 to 2020
  3. Imerys Perlite USA, Inc. 2020 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 6
2025 5
2024 5
2023 5
2022 5
2021 6
2020 6
2019 5
2018 6
2017 6
2016 5
2015 6
2014 5
2000 1
Source: MSHA quarterly employment and production, updated weekly.

TUCKER HILL QUARRY sits in Lake County, Oregon, where the Census mining category is 0.6% 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.
Lake County, Oregon · Population 8,254
0.6%
Mining share of county employment
$61,222
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 2,363 0 0 0.0
2026 Q1 2,271 4 0 1761.3
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
Show 43 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 2,816 0 0 0.0
2024 Q1 2,819 0 0 0.0
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 4 0 1107.1
2020 Q3 3,490 0 0 0.0
2020 Q2 2,552 6 1 2351.1
2020 Q1 1,958 2 0 1021.5
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 file

2016 · 1 incident

March 21, 2016 OR · Metal/Non-Metal drill operator OTHER
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.

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.