El Dorado Springs MO, St Clair County,
MO
·
Intermittent
MSHA Mine ID: 2302576
ElDorado Springs Quarry has $151 in proposed MSHA penalties and $151 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
2026
Latest incident
Jun 2026
Compliance record
MSHA citations since 2025
1
citations
0
significant & substantial
$151
proposed penalties
$0
paid to date
0% of proposed penalties paid to date, a $151 gap.
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: 57 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
ElDorado Springs Quarry has $151 in proposed MSHA penalties and $151 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.
$151
proposed penalties
$151
current assessed
$0
paid to date
$151
outstanding
1 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2025-07-22.
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.
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: 2025-07-23
0%
of limit-tested samples over the exposure limit
5
samples
1
limit-tested
Most sampled contaminants
Respirable dust, <.1mg3
Quartz, respirable, >1% Qtz2
Show the individual readings (5)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2025-07-23
Quartz, respirable, >1% Qtz
0.22
Crusher Oper/Worker
2025-07-23
Quartz, respirable, >1% Qtz
0.52
2.08
0.25
Cleanup Man
2025-07-23
Respirable dust, <.1mg
0
Truck Driver
2025-07-23
Respirable dust, <.1mg
0
Truck Driver
2025-07-23
Respirable dust, <.1mg
0
Truck Driver
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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
12
2025
9
2024
8
2023
10
Source: MSHA quarterly employment and production, updated weekly.
ElDorado Springs Quarry sits in St. Clair County, Missouri, 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.
St. Clair County, Missouri · Population 9,451
0.1%
Mining share of county employment
$46,731
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
6,569
0
0
0.0
2026 Q1
7,316
0
0
0.0
2025 Q4
6,923
0
0
0.0
2025 Q3
6,296
1
0
158.8
2025 Q2
3,101
0
0
0.0
2025 Q1
920
0
0
0.0
2024 Q4
5,136
0
0
0.0
2024 Q3
3,004
0
0
0.0
Show 4 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
1,228
0
0
0.0
2024 Q1
5,361
0
0
0.0
2023 Q4
5,206
0
0
0.0
2023 Q3
244
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
1 on file
2026 · 1 incident
June 19, 2026MO · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techSLIP OR FALL OF PERSON