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Mayo Operation Coal

Corsica, Jefferson County, PA  ·  Abandoned
MSHA Mine ID: 3610256

MSHA sampling at Mayo Operation shows 100% of 22 respirable coal dust samples met the 1.5 mg/m3 standard, plus the mine's fatality, citation, and penalty record.

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Fatalities
0
Total incidents
0
Years on record
—
Latest incident
—
Inspection activity
MSHA inspections since 2018
7
inspections on record
158
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: 158 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

MSHA sampling at Mayo Operation shows 100% of 22 respirable coal dust samples met the 1.5 mg/m3 standard.

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.

Respirable coal dust
ⓘ Respirable coal dust and silica figures cover coal facilities. Dust compliance is measured against the current 1.5 mg/m3 standard; samples predating the 2014 standard are included, so compliance rates are a coarse historical signal.

Last sampled: 2022-08-04, 4 years ago
100%
within 1.5 mg/m3
22
samples
0.35
dust max (mg/m3)
0
over MSHA ECV
ⓘ The excessive concentration value (ECV) is MSHA's own per-sample enforcement threshold, which builds in measurement uncertainty; a sample over its ECV can trigger a citation. The count covers only samples MSHA assigned an ECV.
11 samples taken by MSHA inspectors, 11 by the operator.
Most-sampled occupations
  • BULLDOZER OPERATOR20
  • MECHANIC HELPER1
  • ROTARY BUCKET EXCAVATOR OPERATOR1

Silica (quartz)

Last sampled: 2020-06-05, 6 years ago
0.8
silica avg (%)
1
samples
0.8
silica max (%)
Most-sampled occupations
  • BULLDOZER OPERATOR1
See US coal mines ranked by silica in their dust samples.

Noise
ⓘ The share counts noise samples whose measured dose exceeded the 90 dBA permissible exposure limit. It describes the sampled workplace, not what reached the miner's ear: hearing conservation programs and the hearing protection worn during the shift are recorded separately and are not reflected here.

Last sampled: 2022-08-04, 4 years ago
0%
over PEL
9
samples
Most-sampled occupations
  • BULLDOZER OPERATOR7
  • MECHANIC HELPER1
  • ROTARY BUCKET EXCAVATOR OPERATOR1
See US mines ranked by noise samples over the legal limit.
Source: MSHA respirable dust, quartz, and noise sampling records, updated weekly.
Health sampling trend
ⓘ 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.
Respirable coal dust by year
ⓘ Respirable coal dust and silica figures cover coal facilities. Dust compliance is measured against the current 1.5 mg/m3 standard; samples predating the 2014 standard are included, so compliance rates are a coarse historical signal.
Year within 1.5 mg/m3 samples
2022 100% 5
2020 100% 7
2019 100% 6
2018 100% 4
Noise by year
Year over PEL samples
2022 0% 3
2020 0% 4
2018 0% 2
Source: MSHA respirable dust, quartz, and noise sampling records, updated weekly.
Ownership history
  1. P & N Coal Company Inc 2018 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
ⓘ Coal production is reported quarterly and lags the current period; the most recent quarters may be incomplete.
Year Employees Coal produced (tons)
2022 1 407
2021 0
2020 2 1,446
2019 4 8,928
2018 3 4,371
Source: MSHA quarterly employment and production, updated weekly.

Mayo Operation sits in Jefferson County, Pennsylvania, where the Census mining category is 1.8% 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.
Jefferson County, Pennsylvania · Population 44,099
1.8%
Mining share of county employment
$56,898
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
2022 Q4 0 0 0
2022 Q3 564 0 0 0.0
2022 Q2 856 0 0 0.0
2022 Q1 0 0 0
2021 Q4 0 0 0
2021 Q3 0 0 0
2021 Q2 0 0 0
2021 Q1 0 0 0
Show 10 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2020 Q4 389 0 0 0.0
2020 Q3 1,110 0 0 0.0
2020 Q2 1,379 0 0 0.0
2020 Q1 156 0 0 0.0
2019 Q4 2,115 0 0 0.0
2019 Q3 2,150 0 0 0.0
2019 Q2 2,253 0 0 0.0
2019 Q1 2,835 0 0 0.0
2018 Q4 2,365 0 0 0.0
2018 Q3 1,280 0 0 0.0

No reportable incidents on file.

MSHA has no recorded reportable accidents for this mine in the current dataset. New reports appear here within a week of being filed.