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: 28 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections 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: 2026-09-15
100%
of limit-tested samples over the exposure limit
4
samples
1
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz11 over
Respirable dust, <.1mg3
Show the individual readings (4)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2026-09-15
Quartz, respirable, >1% Qtz
2.86
0.69
4.14
Crusher Oper/Worker
2026-09-15
Respirable dust, <.1mg
0
Rotary Bucket Ex. Operator
2026-09-15
Respirable dust, <.1mg
0
Front-end Loader Operator
2026-09-15
Respirable dust, <.1mg
0
Supervisor, Co. Official
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
15
Source: MSHA quarterly employment and production, updated weekly; years before 2000 come from MSHA's archived Part 50 employment files.
Bison Pit sits in Potter County, Texas, where the Census mining category is 0.6% 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.
Potter County, Texas · Population 116,634
0.6%
Mining share of county employment
$50,448
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; earlier incidents are counted but not rate-adjusted, though reported hours reach back to 1983. 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
8,037
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
1 on file
2026 · 1 incident
September 19, 2026TX · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
WES AGG,LLC · Over-exertion in pulling or pushing objects
Employee was replacing broken machine guard on cone shaker. Employee felt a "pop" in their neck and felt a sharp pain running down their back.