Mining Incidents

Plant 1: 4 MSHA citations Metal/Non-Metal

Ellensburg, Kittitas County, WA  ·  Active
MSHA Mine ID: 4503835

Plant 1 has $604 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
1
Years on record
2025
Latest incident
Apr 2025
Compliance record
MSHA citations since 2025
4
citations
1
significant & substantial
$604
proposed penalties
$604
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2025
3
inspections on record
64
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: 64 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

Plant 1 has $604 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.
$604
proposed penalties
$604
current assessed
$604
paid to date
$0
outstanding
4 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-03-31.
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.
25.0%
significant & substantial
0.0%
high negligence or reckless
25.0%
reasonably likely or greater
0.0%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 75.0% low, 25.0% moderate, 0.0% 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: 2025-09-03
4
samples
0
limit-tested
Most sampled contaminants
  • Unlisted Particulate, respirable, <1% Qtz2
  • Quartz, respirable, >1% Qtz1
  • Respirable dust, <.1mg1
Show the individual readings (4)
Date Contaminant Concentration Limit Conc / limit Occupation
2025-09-03 Quartz, respirable, >1% Qtz 0.66 Laborer, Bullgang
2025-09-03 Unlisted Particulate, respirable, <1% Qtz 0.69 Supervisor, Co. Official
2025-09-03 Unlisted Particulate, respirable, <1% Qtz 0.14 Front-end Loader Operator
2025-09-03 Respirable dust, <.1mg 0 Backhoe Operator
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. Thayer Excavating LLC dba Riverbottom Rock 2023 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 4
2025 7
Source: MSHA quarterly employment and production, updated weekly.

Plant 1 sits in Kittitas County, Washington, where the Census mining category is 0.1% 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.
Kittitas County, Washington · Population 44,736
0.1%
Mining share of county employment
$69,928
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 2,753 0 0 0.0
2026 Q1 2,126 3 1 1411.1
2025 Q4 2,026 0 0 0.0
2025 Q3 2,761 0 0 0.0
2025 Q2 3,513 0 0 0.0
2025 Q1 4,159 1 0 240.4
No fatalities recorded at this mine.

Reportable incidents

1 on file

2025 · 1 incident

April 15, 2025 WA · Metal/Non-Metal rotary bucket excavator operator SLIP OR FALL OF PERSON
Thayer Excavating LLC dba Riverbottom Rock · Fall to the walkway or working surface

The employee climbed off the excavator to relieve themselves. Employee fell when standing on the ground and hit their shoulder/back of their head. Ended with bruising on the shoulder and a hairline fracture of the L2 vertebral. No treatment provided or needed. This was the employee's last day of work.