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Grist Creek Aggregates, Longvale Plant: 107 MSHA citations Metal/Non-Metal

Willits, Mendocino County, CA  ·  Active
MSHA Mine ID: 0405833

Grist Creek Aggregates, Longvale Plant has $32K in proposed MSHA penalties and $0 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
2015–2020
Latest incident
Jun 2020
Compliance record
MSHA citations since 2015
107
citations
38
significant & substantial
$31,711
proposed penalties
$31,711
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
See Grist Creek Aggregates LLC's full MSHA compliance history →
Inspection activity
MSHA inspections since 2012
31
inspections on record
557
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: 557 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

Grist Creek Aggregates, Longvale Plant has $32K in proposed MSHA penalties and $0 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.
$32K
proposed penalties
$32K
current assessed
$32K
paid to date
$0
outstanding
105 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-05-05.
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.
36.2%
significant & substantial
4.8%
high negligence or reckless
37.1%
reasonably likely or greater
61.0%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 10.5% low, 84.8% moderate, 4.8% 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: 2026-02-04
0%
of limit-tested samples over the exposure limit
8
samples
2
limit-tested
Most sampled contaminants
  • Respirable dust, <.1mg6
  • Arsenic fumes1
  • Beryllium fumes1
  • Cadmium oxide fumes1
Show the individual readings (20)
Date Contaminant Concentration Limit Conc / limit Occupation
2026-02-04 Respirable dust, <.1mg 0 Front-end Loader Operator
2025-09-09 Respirable dust, <.1mg 0 Front-end Loader Operator
2024-05-30 Respirable dust, <.1mg 0 Laborer, Bullgang
2022-03-16 Respirable dust, <.1mg 0 Front-end Loader Operator
2022-03-16 Respirable dust, <.1mg 0 Cleanup Man
2016-04-12 Respirable dust, <.1mg 0 Front-end Loader Operator
2015-04-15 Iron oxide fumes 0.03 10 0.00 Iron Worker
2015-04-15 Lead fumes 0 150 0.00 Iron Worker
2015-04-15 Magnesium oxide fumes 0.01 10 0.00 Iron Worker
2015-04-15 Manganese fumes 0 5 0.00 Iron Worker
2015-04-15 Arsenic fumes 0.21 500 0.00 Iron Worker
2015-04-15 Nickel fumes 0 1 0.00 Iron Worker
2015-04-15 Vanadium fumes 0 50 0.00 Iron Worker
2015-04-15 Zinc oxide fumes 0 5 0.00 Iron Worker
2015-04-15 Molybdenum fumes 0 10 0.00 Iron Worker
2015-04-15 Beryllium fumes 0 2 0.00 Iron Worker
2015-04-15 Cadmium oxide fumes 0 100 0.00 Iron Worker
2015-04-15 Chromium, insoluble 0 1 0.00 Iron Worker
2015-04-15 Cobalt fumes 0.02 100 0.00 Iron Worker
2015-04-15 Copper fumes 0.07 100 0.00 Iron Worker
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. Grist Creek Aggregates LLC 2011 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 4
2025 4
2024 4
2023 3
2022 3
2021 3
2020 4
2019 4
2018 4
2017 4
2016 2
2015 5
2014 3
2013 2
2012 3
Source: MSHA quarterly employment and production, updated weekly.

Grist Creek Aggregates, Longvale Plant sits in Mendocino County, California, where the Census mining category is 0.3% 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.
Mendocino County, California · Population 90,709
0.3%
Mining share of county employment
$64,688
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 1,021 1 0 979.4
2026 Q1 928 2 0 2155.2
2025 Q4 1,013 0 0 0.0
2025 Q3 1,001 1 0 999.0
2025 Q2 1,072 0 0 0.0
2025 Q1 974 7 1 7186.9
2024 Q4 1,084 0 0 0.0
2024 Q3 1,205 0 0 0.0
Show 50 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 1,227 2 0 1630.0
2024 Q1 1,095 3 0 2739.7
2023 Q4 1,096 0 0 0.0
2023 Q3 1,452 3 0 2066.1
2023 Q2 1,334 0 0 0.0
2023 Q1 972 2 0 2057.6
2022 Q4 1,209 0 0 0.0
2022 Q3 1,271 0 0 0.0
2022 Q2 1,108 0 0 0.0
2022 Q1 1,038 3 0 2890.2
2021 Q4 976 0 0 0.0
2021 Q3 1,234 0 0 0.0
2021 Q2 1,440 5 1 3472.2
2021 Q1 1,341 4 1 2982.8
2020 Q4 1,404 0 0 0.0
2020 Q3 805 0 0 0.0
2020 Q2 1,120 9 4 8035.7
2020 Q1 1,148 5 0 4355.4
2019 Q4 1,602 0 0 0.0
2019 Q3 1,560 0 0 0.0
2019 Q2 1,720 0 0 0.0
2019 Q1 1,365 7 3 5128.2
2018 Q4 829 0 0 0.0
2018 Q3 1,016 20 14 19685.0
2018 Q2 958 0 0 0.0
2018 Q1 845 0 0 0.0
2017 Q4 1,231 0 0 0.0
2017 Q3 686 0 0 0.0
2017 Q2 1,505 14 9 9302.3
2017 Q1 843 0 0 0.0
2016 Q4 832 0 0 0.0
2016 Q3 550 0 0 0.0
2016 Q2 1,294 8 3 6182.4
2016 Q1 627 0 0 0.0
2015 Q4 3,784 0 0 0.0
2015 Q3 3,479 0 0 0.0
2015 Q2 1,949 11 2 5643.9
2015 Q1 1,139 0 0 0.0
2014 Q4 888 0 0 0.0
2014 Q3 900 0 0 0.0
2014 Q2 881 0 0 0.0
2014 Q1 1,029 0 0 0.0
2013 Q4 429 0 0 0.0
2013 Q3 504 0 0 0.0
2013 Q2 584 0 0 0.0
2013 Q1 486 0 0 0.0
2012 Q4 540 0 0 0.0
2012 Q3 850 0 0 0.0
2012 Q2 1,200 0 0 0.0
2012 Q1 1,200 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

2 on file

2020 · 1 incident

June 4, 2020 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech ELECTRICAL
Grist Creek Aggregates LLC · Contact with electrical current

The Miner failed to follow the lock out/tag out procedure by de-energizing the conveyor and locking it out, and was accidentally shocked while attempting to plug in the #4 S.O Cord to the 3/4 Washed conveyor as the result. EE was discharged from the Hospital within the day. EE suffers from a sore neck and shoulders.

2015 · 1 incident

June 19, 2015 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Grist Creek Aggregates LLC · Struck by... (Not Elsewhere Classified)

Two miners rigged conveyor to move. Upon lifting, the rigging became unhooked. While attempting to lower it the conveyor flopped over. The miner on the ground was standing to close and as it rolled over one of the adjusting screws caught him in the lower leg. The miner was taken, by ambulance, to closest hospital. Result was a broken lower right leg.