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: 406 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Houston Plant #2 has $38K 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.
$38K
proposed penalties
$38K
current assessed
$38K
paid to date
$0
outstanding
53 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-02-24.
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: 2026-07-29
0%
of limit-tested samples over the exposure limit
16
samples
7
limit-tested
Most sampled contaminants
Respirable dust, <.1mg4
Nuisance dust, total, <1% Qtz3
Unlisted Particulate, respirable, <1% Qtz3
Nuisance dust, respirable, <1% Qtz2
Show the individual readings (28)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2026-07-29
Quartz, respirable, >1% Qtz
0.59
Building Repair/Maint.
2026-07-29
Respirable dust, <.1mg
0
Front-end Loader Operator
2026-07-29
Unlisted Particulate, respirable, <1% Qtz
5.61
Bagging Operator
2026-02-25
Unlisted Particulate, respirable, <1% Qtz
1.35
Bagging Operator
2026-02-25
Unlisted Particulate, respirable, <1% Qtz
0.16
Front-end Loader Operator
2025-08-19
Nuisance dust, respirable, <1% Qtz
2.32
10
0.23
Bagging Operator
2025-08-19
Nuisance dust, respirable, <1% Qtz
1.11
10
0.11
Mechanic
2025-08-19
Respirable dust, <.1mg
0
Warehouse Man
2024-07-25
Respirable dust, <.1mg
0
Mechanic
2024-07-25
Respirable dust, <.1mg
0
Front-end Loader Operator
2024-02-14
Lead fumes
5
150
0.03
Mechanic
2024-02-14
Magnesium oxide fumes
0.02
10
0.00
Mechanic
2024-02-14
Manganese fumes
0.03
5
0.01
Mechanic
2024-02-14
Nickel fumes
0
1
0.00
Mechanic
2024-02-14
Vanadium fumes
0
50
0.00
Mechanic
2024-02-14
Zinc oxide fumes
0.03
5
0.01
Mechanic
2024-02-14
Molybdenum fumes
0
10
0.00
Mechanic
2024-02-14
Beryllium fumes
0
2
0.00
Mechanic
2024-02-14
Nuisance dust, total, <1% Qtz
0
10
0.00
Bagging Operator
2024-02-14
Nuisance dust, total, <1% Qtz
0.87
10
0.09
Janitor
2024-02-14
Arsenic fumes
0
500
0.00
Mechanic
2024-02-14
Cadmium oxide fumes
0
100
0.00
Mechanic
2024-02-14
Chromium, insoluble
0
1
0.00
Mechanic
2024-02-14
Cobalt fumes
0
100
0.00
Mechanic
2024-02-14
Copper fumes
0
100
0.00
Mechanic
2024-02-14
Iron oxide fumes
0.08
10
0.01
Mechanic
2022-06-28
Nuisance dust, total, <1% Qtz
1.72
10
0.17
Bagging Operator
2022-06-28
Unlisted Particulate, total, <1% Qtz
0.13
Forklift 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.
Houston Plant #2 recorded 2.14 reportable injury cases per 100 full-time workers in 2025.
Injury rate, 2025
ⓘThis rate is reportable injury cases per 100 full-time-equivalent workers per year, computed as 200,000 times cases divided by MSHA operator-reported employee-hours. Cases are injuries MSHA graded degree 01 through 07; accident-only events that hurt no one are excluded, and so are contractor injuries, whose hours do not attach to a single mine. Rates begin in 2000, when quarterly employment reporting starts, and are withheld below 20,000 hours in a year.
2.14
total case rate
2.14
days-away rate
0.000
fatality rate
Above average. The US metal and nonmetal mining average was 1.65 and the all-US-mining average was 1.97 cases per 100 workers.
In Texas, metal and nonmetal mining averaged 1.17 cases per 100 workers that year.
Under 100,000 employee-hours were reported that year, so a single case moves the rate by two or more. Read the figure as approximate.
Year
total case rate
days-away
fatal
2025 *
2.14
2.14
0.000
2023
0.00
0.00
0.000
2022
1.67
1.67
0.000
2021
1.92
0.00
0.000
* Fewer than 100,000 employee-hours that year; the rate is less stable.
Source: injury cases from MSHA accident and injury records; employee-hours from MSHA quarterly employment reports. Rate is cases per 100 full-time-equivalent workers, operator employees only.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
34
2025
35
2024
41
2023
49
2022
47
2021
45
2020
42
Source: MSHA quarterly employment and production, updated weekly.
Houston Plant #2 sits in Harris County, Texas, where the Census mining category is 2.3% 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.
Harris County, Texas · Population 4,758,579
2.3%
Mining share of county employment
$73,104
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
24,660
0
0
0.0
2026 Q1
23,136
3
0
129.7
2025 Q4
23,843
0
0
0.0
2025 Q3
22,852
6
1
262.6
2025 Q2
25,022
0
0
0.0
2025 Q1
21,879
3
0
137.1
2024 Q4
22,703
0
0
0.0
2024 Q2
26,484
7
5
264.3
Show 14 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q1
27,568
13
7
471.6
2023 Q4
28,602
0
0
0.0
2023 Q3
27,938
0
0
0.0
2023 Q2
29,700
1
0
33.7
2023 Q1
32,023
0
0
0.0
2022 Q4
30,569
0
0
0.0
2022 Q3
28,186
0
0
0.0
2022 Q2
30,844
4
1
129.7
2022 Q1
29,906
2
0
66.9
2021 Q4
27,968
0
0
0.0
2021 Q3
30,459
3
0
98.5
2021 Q2
28,894
0
0
0.0
2021 Q1
16,786
8
2
476.6
2020 Q4
23,742
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
4 on file
2025 · 1 incident
January 17, 2025TX · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techMACHINERY
During repair to a water pipe located under concrete. A jack hammer was used & connected to the welder/generator for power. The generator was turned off. When they went to use jack hammer again the generator would not start. A forklift and jumper cables were used to crank the welding machine. EE went to remove the jumper cables & EE's hand got caught in the fan.
2024 · 1 incident
May 6, 2024TX · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techSLIP OR FALL OF PERSON
EE was helping replace a vent fan motor. The motor was already on the catwalk and EE climbed the ladder so they could hand EE the motor. Before they could hand the motor to EE, EE slipped and fell backwards and over the railing, approx 26ft fall & landing at an angle. EE's left ankle hit first and then EE's head.
2022 · 1 incident
May 23, 2022TX · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanMACHINERY
Employee did not realize the mill had not been flowing and the media had heated up the material in the attritor due to friction, EE then removed a hose without closing the valve which allowed the hot material to escape which caused burns to both hands.
2021 · 1 incident
January 25, 2021TX · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorSLIP OR FALL OF PERSON
EE was attempting to turn off the blower, when EE turned to do so, the area was wet from the rain, EE slipped. EE tried to catch themself and their arm hit the pipe coupling bolts causing a laceration. EE was sent to local clinic and the cut was stitched, EE was given antibiotics and a tetanus shot.
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