Alpine Silica-San Antonio has $25K in proposed MSHA penalties and $3K outstanding across 1 contested dockets, plus health sampling and the full incident record.
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Fatalities
1
Total incidents
15
Years on record
2019–2026
Latest incident
Mar 2026
Compliance record
MSHA citations since 2020
78
citations
16
significant & substantial
$24,563
proposed penalties
$21,485
paid to date
87% of proposed penalties paid to date, a $3,078 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: 549 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Imminent-danger orders
ⓘA Section 107(a) order removes miners from an area when an inspector finds an imminent danger. Each order is lifted once the condition is corrected, so this counts orders issued, not orders now in effect.
3
Section 107(a) orders
Most recent order: 2025-07-08.
On record since 2020.
Source: MSHA imminent-danger order records, updated weekly.
Alpine Silica-San Antonio has $25K in proposed MSHA penalties and $3K outstanding across 1 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.
$25K
proposed penalties
$25K
current assessed
$21K
paid to date
$3K
outstanding
69 assessments are final orders; 1 contested dockets.
Of $601 in penalties contested before the Commission, $601 was upheld in final decisions.
As of the most recent assessment on 2026-05-27.
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.
When citations were contested
ⓘContesting a citation before the Federal Mine Safety and Health Review Commission is a lawful right. These figures state the public outcomes of that process, from MSHA's Contested Violations file.
3citations taken to the federal commission · 4% of citations on record
Stood as issued
3 · 100%
100%
S&S designation survived the contest
ⓘCounts a Significant & Substantial citation as surviving when a settlement or judge's decision kept the designation, or the contest was dismissed or defaulted so the citation stands as issued. Vacated and withdrawn citations, and settlements that removed the designation, count against.
of 3 decided S&S contests · industry: 79%
0%
Penalty reduction in decided contests
$601 proposed, $601 after decisions · industry: 39%
Source: MSHA Contested Violations file (public record), updated weekly. A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record. Latest contest filed 2021-06-27.
Contested penalties
ⓘA reduction or dismissal at the Commission is a lawful outcome of contesting a proposed penalty. Figures are the proposed amount and the amount upheld in the docket's decision.
Largest penalties this mine contested before the Federal Mine Safety and Health Review Commission, with the outcome on record.
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: 2025-11-14
0%
of limit-tested samples over the exposure limit
9
samples
6
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz5
Respirable dust, <.1mg3
Nuisance dust, respirable, <1% Qtz1
Show the individual readings (9)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2025-11-14
Nuisance dust, respirable, <1% Qtz
5.92
10
0.59
Dry Screen Plant Operator
2025-11-14
Quartz, respirable, >1% Qtz
0.48
1.27
0.38
Laborer, Bullgang
2025-11-14
Quartz, respirable, >1% Qtz
0.38
1.18
0.32
Laborer, Bullgang
2023-07-05
Respirable dust, <.1mg
0
Laborer, Bullgang
2023-07-05
Quartz, respirable, >1% Qtz
0.12
0.33
0.36
Laborer, Bullgang
2023-07-05
Respirable dust, <.1mg
0
Front-end Loader Operator
2020-01-29
Quartz, respirable, >1% Qtz
0.47
0.52
0.90
Kiln/Dryer Operator
2020-01-29
Respirable dust, <.1mg
0
Washer Operator
2020-01-29
Quartz, respirable, >1% Qtz
0.16
0.47
0.34
Building Repair/Maint.
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.
Alpine Silica-San Antonio recorded 0.00 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.
0.00
total case rate
0.00
days-away rate
0.000
fatality rate
Below 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.
Year
total case rate
days-away
fatal
2025
0.00
0.00
0.000
2024
4.86
3.24
0.000
2023
3.51
0.00
0.000
2021
1.42
1.42
0.000
2020
0.00
0.00
0.000
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
63
2025
59
2024
54
2023
61
2022
60
2021
48
2020
37
2019
48
Source: MSHA quarterly employment and production, updated weekly.
Alpine Silica-San Antonio sits in Bexar 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.
Bexar County, Texas · Population 2,037,344
0.6%
Mining share of county employment
$70,571
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
35,602
1
1
28.1
2026 Q1
34,976
2
0
57.2
2025 Q4
36,194
2
0
55.3
2025 Q3
39,641
1
0
25.2
2025 Q2
37,479
0
0
0.0
2025 Q1
40,641
0
0
0.0
2024 Q4
28,523
3
0
105.2
2024 Q3
26,229
4
0
152.5
Show 20 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
38,456
0
0
0.0
2024 Q1
30,348
4
0
131.8
2023 Q4
39,094
0
0
0.0
2023 Q3
40,361
8
0
198.2
2023 Q2
49,069
6
0
122.3
2023 Q1
42,501
0
0
0.0
2022 Q3
49,967
2
1
40.0
2022 Q2
47,815
0
0
0.0
2022 Q1
40,013
4
2
100.0
2021 Q4
45,486
0
0
0.0
2021 Q3
28,877
6
2
207.8
2021 Q2
36,422
0
0
0.0
2021 Q1
30,492
5
3
164.0
2020 Q4
23,250
0
0
0.0
2020 Q3
13,888
0
0
0.0
2020 Q2
24,673
1
0
40.5
2020 Q1
49,547
6
1
121.1
2019 Q4
52,907
0
0
0.0
2019 Q3
37,813
0
0
0.0
2019 Q2
20,274
0
0
0.0
Fatalities at this mine
1 recorded
March 28, 2026TX · Metal/Non-Metalsteel worker, iron metal worker, iron workerFatality · SLIP OR FALL OF PERSON
Operator was using a 2 pound sledgehammer to remove a worn tooth from an excavator bucket. When the operator hit the worn tooth (one time) with the hammer, a metal shard broke off of the worn tooth and passed through the operator's pants and the top of EE's leather boots before penetrating the operator's left leg, just above EE's ankle.
November 30, 2024TX · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorHANDLING OF MATERIALS
Miner struck by 'clay boulder' when EE crawled into a feed hopper to clear an obstruction. The miner suffered muscle damage requiring hospitalization and medication. Diagnosed with Rhabdomyolysis. No broken bones were found during the examination.
Miner suffered 3rd degree burns to the abdomen when a hose popped off the seal pump in the process of removal. Burns required debridement and an allograft.
While observing another miner removing teeth from an excavator bucket from approximately 5-6 feet away. The injured miner was struck in the hand by a shard of metal (approximately 4mm X5mm) that broke off of the excavator tooth.
Miner suffered pinch caused laceration to 5th digit of right hand when latch sprung open from tension on rotex door. Miner was in process of inspecting screens. Laceration required 3 sutures to close wound. Miner returned to work to complete shift.
March 26, 2023TX · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorHANDTOOLS (NONPOWERED)
Miner suffered crushing laceration to big toe on right foot when a counterweight fell, striking EE's foot. EE was wearing steel toe boots which protected the foot from more serious injury. The miners were in process of changing a belt on wet plant machinery. A come-a-long holding the counterweight slipped allowing the weight to fall.
While conducting inspection of a conveyor, they grasped a roller which had a sharp edge causing laceration to their hand which required 5 sutures to close the wound.
EE was traveling down the main entrance road, with EE's bucket down low and hit a pot hole. EE's bucket contacted the ground and the loader came to an abrupt stop and EE's improperly adjusted seat belt let EE bounce too far forward. EE slammed into the front of the loader causing a concussion (w/o LOC), small forehead cuts, and bruising.
June 9, 2022TX · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techPOWERED HAULAGE
Employee was adjusting the chain rigging on a dewatering screen motor. They hooked the rigging onto the fork of a skytrac. The skytrac operator did not wait for verbal confirmation or hand signals to begin lifting the load. Employee still had a hand on the chain and received a laceration on right hand ring finger.
April 1, 2022TX · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techPOWERED HAULAGE
An employee was driving the manlift around the side of the plant to look into one of the main feed hoppers to check for a material cog. A front wheel loader working in the area did not see the manlift and backed into it. This caused the employee to slam into the handrail. This caused a muscle contusion on EE's left leg.
2021 · 1 incident
March 19, 2021TX · Metal/Non-Metalhaul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driverHANDLING OF MATERIALS
A truck driver arrived on site around 10:15PM and pulled up to MS, LLC's Safe Rach System to open the sand box hatch. Driver lowered the Safe-Rack cage properly onto the box. While opening the box hatch, Driver slipped and fell into the sand box. Local emergency response used a rescue ladder to help the driver climb out of the sand box.