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: 126 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Portable #4 has $4K 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.
$4K
proposed penalties
$4K
current assessed
$4K
paid to date
$0
outstanding
30 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2025-09-10.
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: 2017-08-08, 9 years ago
0%
of limit-tested samples over the exposure limit
7
samples
2
limit-tested
Most sampled contaminants
Respirable dust, <.1mg3
Unlisted Particulate, respirable, <1% Qtz2
Nuisance dust, respirable, <1% Qtz1
Quartz, respirable, >1% Qtz1
Show the individual readings (7)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2017-08-08
Respirable dust, <.1mg
0
Front-end Loader Operator
2017-08-08
Unlisted Particulate, respirable, <1% Qtz
0.7
Laborer, Bullgang
2014-08-06
Quartz, respirable, >1% Qtz
0.91
2.57
0.35
Cleanup Man
2014-08-06
Unlisted Particulate, respirable, <1% Qtz
0.16
Front-end Loader Operator
2012-09-20
Respirable dust, <.1mg
0
Front-end Loader Operator
2012-09-20
Respirable dust, <.1mg
0
Front-end Loader Operator
2012-09-20
Nuisance dust, respirable, <1% Qtz
0.73
10
0.07
Crusher Oper/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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
6
2025
5
2022
3
2021
4
2019
3
2018
4
2017
3
2015
3
2014
6
2013
7
2012
8
Source: MSHA quarterly employment and production, updated weekly.
Portable #4 sits in Lea County, New Mexico, where the Census mining category is 16.0% 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.
Lea County, New Mexico · Population 73,154
16.0%
Mining share of county employment
$68,750
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
3,851
0
0
0.0
2026 Q1
4,904
0
0
0.0
2025 Q4
3,400
0
0
0.0
2025 Q3
3,207
3
0
935.5
2022 Q1
682
0
0
0.0
2021 Q4
1,936
0
0
0.0
2019 Q3
287
0
0
0.0
2019 Q2
1,230
2
0
1626.0
Show 24 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2019 Q1
1,365
0
0
0.0
2018 Q4
1,465
1
1
682.6
2018 Q3
1,489
1
1
671.6
2018 Q2
2,466
0
0
0.0
2018 Q1
967
0
0
0.0
2017 Q4
929
5
1
5382.1
2017 Q3
1,436
1
1
696.4
2017 Q2
2,018
0
0
0.0
2017 Q1
1,572
0
0
0.0
2015 Q3
3,473
0
0
0.0
2015 Q2
170
0
0
0.0
2015 Q1
1,260
1
0
793.7
2014 Q4
315
0
0
0.0
2014 Q3
997
2
0
2006.0
2014 Q2
1,118
0
0
0.0
2014 Q1
1,058
0
0
0.0
2013 Q4
2,067
0
0
0.0
2013 Q3
3,535
2
0
565.8
2013 Q2
5,410
0
0
0.0
2013 Q1
5,539
1
0
180.5
2012 Q4
3,660
3
0
819.7
2012 Q3
3,656
0
0
0.0
2012 Q2
2,784
0
0
0.0
2012 Q1
320
7
2
21875.0
No fatalities recorded at this mine.
Reportable incidents
1 on file
2017 · 1 incident
December 21, 2017NM · Metal/Non-Metalcrusher attendant/operator, pan feeder operator/workerHANDTOOLS (NONPOWERED)
While tightening a lug nut on the HSI crusher, the wrench slipped causing their hand to come in contact with a metal plate resulting in a fairly deep cut on the thumb of the right hand.