MSHA DATABASEMSHA records · 16 contributing sources · snapshot Oct 18, 2026

MINE DETAILS

American Soda LLC

ActiveUndergroundTrona
MSHA MINE ID4801295
LOCATIONSweetwater, WY
PUBLIC RECORD22,904 linked rows

LOCATION

Mine location

1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.

Mine coordinates

2025-01-01 – 2026-10-18Applies to production, safety and portfolio metrics. Silica samples have separate filters.

Violations

295

34 significant & substantial (S&S)

  1. 2025 Q155
  2. 2025 Q238
  3. 2025 Q329
  4. 2025 Q431
  5. 2026 Q158
  6. 2026 Q248
  7. 2026 Q323
  8. 2026 Q4 *13

Accident records

13

0 records classified as fatality

  1. 2025 Q14
  2. 2025 Q22
  3. 2025 Q32
  4. 2025 Q42
  5. 2026 Q10
  6. 2026 Q21
  7. 2026 Q32
  8. 2026 Q4 *0

Proposed penalties · USD

201,454.00

279 of 295 violations with amounts

  1. 2025 Q157,598
  2. 2025 Q249,617
  3. 2025 Q314,586
  4. 2025 Q410,223
  5. 2026 Q126,568
  6. 2026 Q238,371
  7. 2026 Q34,491
  8. 2026 Q4 *—

On-site inspection hours

2,253.00

145 inspections · 145 with hours

  1. 2025 Q1332.50
  2. 2025 Q2282.50
  3. 2025 Q3258.50
  4. 2025 Q4283.00
  5. 2026 Q1333.75
  6. 2026 Q2402.75
  7. 2026 Q3291.50
  8. 2026 Q4 *68.50
Quarterly safety data
QuarterViolationsS&SProposed USDAccident recordsFatality recordsInspectionsOn-site hours
2025-Q155957,598.004020332.5
2025-Q238949,617.002019282.5
2025-Q329214,586.002022258.5
2025-Q431110,223.002021283.0
2026-Q158226,568.000019333.8
2026-Q2481138,371.001020402.8
2026-Q32304,491.002021291.5
2026-Q4 *130—00368.5

Most cited CFR sections

All violations issued in the selected period. Counts combine subsections.

Safety activity

  1. accident220262570017

    MACHINERY · DAYS AWAY FROM WORK ONLY

    Accident narrative

    Miner was advancing shields when the pin on the relay bar broke and struck the miner in the ankle causing a small fracture.

  2. accident220262020012

    HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    A roof bolter operator was exposed to fluid when a hydraulic hose was inadvertently actuated and fluid sprayed from a cut in the hose into the employee's left eye. The employee immediately irrigated the affected eye but continued to experience irritation. EE was subsequently evaluated at a medical clinic, where a foreign object was removed from the eye and prescribed antibiotics.

  3. accident220261470001

    HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY

    Accident narrative

    The operator was performing a wash-down using hot condensate when the hose split, resulting in second-degree burns to the chest area.

  4. accident220253570010

    HANDTOOLS (NONPOWERED) · DAYS RESTRICTED ACTIVITY ONLY

    Accident narrative

    The separation of the rib/arch struck the employee

  5. accident220253170606

    HOISTING · ACCIDENT ONLY

    Accident narrative

    While lifting the longwall crusher into the cage using the overhead crane, the crane faulted. Had to get equipment to replace the fuse to continue loading and hoisting the crusher.

  6. accident220253170018

    HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    An employee was conducting an inspection of the burner in DR-8, Argo Kiln. The employee was wearing a Tyvek dust suit, N95 dust mask, gloves, a hard hat, and safety glasses. As they were exiting the kiln, a small piece of dried soda ash struck their hard hat, and dust from the soda ash made contact with their left eye.

  7. accident220251900022

    HANDLING OF MATERIALS · DYS AWY FRM WRK & RESTRCTD ACT

    Accident narrative

    Employee activated the spring return on the lubrication hoses and became tangled in the hose and fell.

  8. accident220251010007

    SLIP OR FALL OF PERSON · DAYS AWAY FROM WORK ONLY

    Accident narrative

    An employee was standing on a 17 inch two step working platform performing maintenance work. As EE applied force to the box end wrench, the wrench slipped causing EE to lose balance and fall. In falling, EE's right knee contacted a ceramic liner, resulting in a fractured knee cap.

  9. accident220251000005

    HANDTOOLS (NONPOWERED) · DAYS AWAY FROM WORK ONLY

    Accident narrative

    The employee was climbing down a scaffold ladder. Employee was tied off to an overhead SRL while descending a ladder. Their personal srl got caught on the scaffold gate. While descending the ladder, they noticed the caught psrl hook. As they looked up at it, the hook freed itself and retracted as designed. In that retracting process, the hook hit our employee in the mouth.

  10. accident220250920038

    FALL OF ROOF OR BACK · DYS AWY FRM WRK & RESTRCTD ACT

    Accident narrative

    A Mine Production employee was in the process of bolting at 8 BMR. Employee noticed a bad top in the entry and exited the cab of the bolter to bar down the hazard. As employee barred down, the arch behind the employee came loose and fell and struck the employee from behind.

  11. accident220250920007

    MACHINERY · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    A Mine Production employee was operating bolter drilling a 14 foot drill hole when the steel became stuck. EE placed EE's left hand on the drill steel to apply outward force to free the steel and reached for what EE thought was the lowering lever and inadvertently activated the rotation lever. In doing so EEs hand rotated with the drill steel causing a dislocated left pinky finger.

  12. accident220250790001

    POWERED HAULAGE · DAYS RESTRICTED ACTIVITY ONLY

    Accident narrative

    The underground Utility Crew was taking structure down from a panel. As they were bringing in the forklift EE noticed a rail was close to the forklift tire and was going to run over it. EE bent down to move it out of the way, but the tire of the forklift ran over the end of the rail picking up the other side, hitting the employee in the lip.

  13. accident220250490043

    SLIP OR FALL OF PERSON · DYS AWY FRM WRK & RESTRCTD ACT

    Accident narrative

    On February 11, 2025, a mine maintenance employee was performing routine maintenance on a borer miner. While stepping onto the bore miner rotor bit block, EE's foot slipped, resulting in a fall and a laceration to EE's left calf from contact with the borer miner bit. The injury required sutures.

Safety sources and definitions

MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-18.

Counts describe published rows, including contractor records; accident records are not distinct incidents or numbers of people injured.

Zero means no matching records in the imported sources, not proof of no events. Historical coverage differs by source; absence before a source begins reporting is not a zero incident rate. Invalid or absent dates and records after the snapshot are excluded.

S&S means SIG_SUB=Y. Fatality records use DEGREE_INJURY_CD=01. Proposed penalties are not final assessed or paid amounts; missing dollar values are omitted.

Inspection hours are SUM_TOTAL_ON_SITE_HOURS attributed to the inspection start date, without supervisor/trainee hours. Missing hours are omitted; a started inspection may still be open.

Portfolio totals use current mine membership, including events before the current owner or operator's tenure.

CFR headings link to the current Title 30 index; they are not historical legal determinations.

OWNERSHIP

Operator and controller history

Current ownership comes from MSHA Mines. Historical start and end dates come from MSHA Controller and Operator History.

CURRENT HIERARCHYSolvay S A → American Soda LLC → American Soda LLC
HISTORY RECORDS39 relationships
INTERVAL CHECKPASScontroller/operator overlap
—

Solvay S AcontrolsAmerican Soda LLCoperatesAmerican Soda LLC

msha-controller-operator-history · controller/operator co-tenure derived on mine 4801295
—

Solvay S AcontrolsSolvay Chemicals, IncoperatesAmerican Soda LLC

msha-controller-operator-history · controller/operator co-tenure derived on mine 4801295
—

Tenneco InccontrolsTenneco Minerals CompanyoperatesAmerican Soda LLC

msha-controller-operator-history · controller/operator co-tenure derived on mine 4801295
Other historical summaries · source-specific periods

RECORD SUMMARY

Production, safety and enforcement

These summaries use the periods stated on each card, independently of the reporting period above.

01 / SAFETYwatch

Accidents and injuries

475 historical accident/injury rows; 0 coded fatalities and 9,382 lost days across the published record.

ACCIDENT + INJURY RECORD60 since 2021
accidentsmine-production-quarterly
02 / COMPLIANCEwatch

Violations and penalties

3,267 violation rows across the full record; 431 carry an S&S flag and $1,135,355 appears in current assessed amounts.

ENFORCEMENT ACTIVITY1,127 since 2021
inspectionsviolationsassessed-violationsorders-107a
03 / HEALTHwatch

Occupational health samples

286 personal; 19 area. 28 personal-sample rows have a published C/E ratio above 1; 0 noise rows have an action-level or PEL dose above 100%. These are separate measures, not a silica exceedance count. Silica results and sample status are shown separately.

OCCUPATIONAL EXPOSURE305 samples
personal-health-samplesarea-samples
04 / PRODUCTIONcontext

Quarterly production and employment

235K employee hours and 448 summed average employees across reported subunits in the latest published quarter.

2026-Q20 tons
mine-production-quarterlymine-production-yearly
05 / LEGALwatch

Contests, conferences and decisions

204 contested-violation rows, 207 civil-penalty docket/decision rows, and 151 conference records linked by issuance number.

POST-ISSUANCE LIFECYCLE562 linked rows
conferencescontested-violationscivil-penalty-dockets-decisions
06 / CONTRACTORScontext

Contractors

Contractors are linked through this mine’s violation or accident records. Their production and hours cover all their operations, so they are not included in this mine’s totals.

ENTITY-LEVEL CONTEXT70 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations
07 / INSPECTIONScontext

Inspections

2,024 inspection events and 38K published inspection hours across the historical record.

OVERSIGHT COVERAGE475 since 2021
inspectionsviolations

HEALTH SAMPLING

Silica and quartz

Matching records70 coal · 7 personal · 0 area
Sample status0 not voided0 voided · 7 status not reported
Personal samples with C/E > 107 published ratios · not a citation count
2026 · Apr 21, 2026–Oct 2, 2026
Date / sampleDataset / analyteOccupation / areaMeasurementSample statusPublished action
000000202604126600Metal/nonmetal personalQuartz, respirable, >1% QtzBelt Crew0× published limitConcentration: 0000.27 · limit: 0000.00Source unit unspecifiedNot reportedNO ACTIONInspection F03CC89
000000202604126700Metal/nonmetal personalQuartz, respirable, >1% QtzBelt Crew0× published limitConcentration: 0000.37 · limit: 0000.00Source unit unspecifiedNot reportedNO ACTIONInspection F03CC89
000000202601836900Metal/nonmetal personalQuartz, respirable, >1% QtzMechanic0× published limitConcentration: 0000.13 · limit: 0000.00Source unit unspecifiedNot reportedNO ACTIONInspection F045129
000000202601787200Metal/nonmetal personalQuartz, respirable, >1% QtzCont. Miner Operator0.73× published limitConcentration: 0002.14 · limit: 0002.94Source unit unspecifiedNot reportedNO ACTIONInspection F045129
000000202601787300Metal/nonmetal personalQuartz, respirable, >1% QtzShuttle Car Operator (diesel)0× published limitConcentration: 0000.30 · limit: 0000.00Source unit unspecifiedNot reportedNO ACTIONInspection F045129
000000202601787400Metal/nonmetal personalQuartz, respirable, >1% QtzRoof Bolter, Rock0.31× published limitConcentration: 0000.85 · limit: 0002.78Source unit unspecifiedNot reportedNO ACTIONInspection F045129
000000202601660700Metal/nonmetal personalQuartz, respirable, >1% QtzElectrician0× published limitConcentration: 0000.13 · limit: 0000.00Source unit unspecifiedNot reportedNO ACTIONInspection F045129
Sources and interpretation
  • Coal means use numeric concentrations from samples marked not voided, excluding control/invalid sample types and dates after the snapshot. Missing values remain null; reported zeroes remain zero.
  • Quarterly means describe available samples, not mine-wide or worker-average exposure. Quarters with no eligible measurements remain empty; the current quarter is partial.
  • Personal C/E is MSHA's published concentration-to-limit ratio. A value above 1 is not by itself a citation or a determination under the 2024 silica rule. Personal and area files do not publish a void-status field.
  • Area records include bulk-dust analyses and are kept separate from personal exposure results. Their concentration units are not specified in the source dictionary.
  • Missing samples do not establish safe conditions. Coal quartz percentage and concentration are separate measures. No compliance threshold is inferred for coal samples.

Coal quartz field definitions ↗Metal/nonmetal personal field definitions ↗Metal/nonmetal area field definitions ↗

EIA + TITLE 30

EIA production and cited regulations

EIA annual figures are reported separately from MSHA. Regulation links use the current eCFR snapshot.

RECENT PUBLIC RECORDS

Recent violations and samples

Latest records retained for inspection; aggregates above use the full source history.

VIOLATIONS12 latest shown
990528157.14207Citation
505748357.12028Citation
505748257.12030Citation
990528057.4201(a)(1)Citation
505748157.12028Citation
505748057.14107(a)Citation
505747957.4200(a)(1)Citation
990527957.4460(a)(1)Citation
OTHER HEALTH SAMPLES5 latest shown

Coal dust, noise and other contaminants. Silica records above ↑

Unlisted Particulate, respirable, <1% QtzCleanup Man
C/E: 00.00Concentration: 0000.40 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzCleanup Man
C/E: 00.00Concentration: 0000.29 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgMechanic
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgMechanic
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzShuttle Car Operator (diesel)
C/E: 00.00Concentration: 0016.63 · limit: 0000.00Source unit unspecified

SOURCE COVERAGE

Reporting dates and coverage

16 datasets contain linked records. Missing datasets are listed below.

DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors475Jan 6, 2000—Sep 8, 2026mine-keyed
Addresses of Recordidentity · logistics1Oct 1, 1979—Oct 1, 1979mine-keyed
Assessed Violationscompliance · legal3,224Feb 23, 2000—Sep 9, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal207Aug 15, 2001—Mar 30, 2026mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal151Apr 4, 2000—Oct 5, 2026mine-keyed
Contested Violationscompliance · legal204Sep 15, 2006—May 5, 2026mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety10,373Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety2,138Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance3Aug 1, 1979—Nov 1, 2021mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance423Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance108Not published—Not publishedmine-keyed
Inspectionssafety · compliance2,024Jan 3, 2000—Oct 7, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety19Nov 13, 2017—Dec 16, 2025mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety286May 30, 2001—Oct 2, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal3,267Jan 30, 2000—Oct 7, 2026mine-keyed
107(a) Orders Issuedsafety · compliance—No published rowsabsent / not applicable

NOTES

Limitations

  • Contractor production is entity-level and is never represented as mine-attributable.
  • Missing rows can mean no event, publication delay, identity mismatch, or inapplicability.