MINE DETAILS
EAST BOULDER MINE
MSHA MINE ID2401879
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- EAST BOULDER MINE45.50361, -110.08583Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-17. MSHA quarterly production and employment reports.
Coal production
—reported short tons
Hours worked
—reported employee hours
Tons per hour
—production ÷ hours worked
Missing values appear as —. Totals use available reports. Tons per hour requires production and hours for the same quarters and a nonzero hours total. * Striped bars mark partial mine coverage or an incomplete quarter. See the table for coverage.
Quarterly data and reporting coverage
| Quarter | Coal (short tons) | Hours worked | Tons / hour | Avg. employees | Coverage |
|---|---|---|---|---|---|
| 2025 Q1 | — | — | — | — | No report |
| 2025 Q2 | — | — | — | — | No report |
| 2025 Q3 | — | — | — | — | No report |
| 2025 Q4 | — | — | — | — | No report |
| 2026 Q1 | — | — | — | — | No report |
| 2026 Q2 | — | — | — | — | No report |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-17
Violations
24839 significant & substantial (S&S)
Accident records
230 records classified as fatality
Proposed penalties · USD
205,319.00244 of 248 violations with amounts
On-site inspection hours
1,530.5033 inspections · 33 with hours
Counts are published records, including contractor records. * The quarter was incomplete at the snapshot date; recent counts may rise as reports arrive. — means no reported amount or hours. Portfolio totals use current membership.
Quarterly safety data
| Quarter | Violations | S&S | Proposed USD | Accident records | Fatality records | Inspections | On-site hours |
|---|---|---|---|---|---|---|---|
| 2025-Q1 | 41 | 9 | 19,755.00 | 2 | 0 | 10 | 206.3 |
| 2025-Q2 | 43 | 5 | 27,042.00 | 6 | 0 | 5 | 222.3 |
| 2025-Q3 | 48 | 4 | 37,397.00 | 4 | 0 | 6 | 237.5 |
| 2025-Q4 | 33 | 1 | 18,185.00 | 3 | 0 | 2 | 197.5 |
| 2026-Q1 | 38 | 5 | 36,988.00 | 1 | 0 | 3 | 260.0 |
| 2026-Q2 | 13 | 3 | 26,329.00 | 5 | 0 | 2 | 165.0 |
| 2026-Q3 | 32 | 12 | 39,623.00 | 2 | 0 | 5 | 242.0 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
SLIP OR FALL OF PERSON · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
A mechanic was working to change a damaged hydraulic hose on a 4yd loader in the field. The mechanic was stepping away from the machine when EE lost EE's footing and fell backwards into the rib that EE was standing very near. The back of EE's hardhat contacted the rib and caused a 1" laceration to the back of the head.
Impoundment Spot Inspection · 3.0 on-site hours
Compliance Follow-up Inspection · 8.5 on-site hours
57.12032 · $226.00 proposed
57.12032 · S&S · $3,736.00 proposed
57.4504(b) · $151.00 proposed
57.5066(a) · $151.00 proposed
57.14107(a) · $209.00 proposed
57.12032 · $755.00 proposed
MACHINERY · DAYS AWAY FROM WORK ONLY
Accident narrative
Employee was in the process of bolting with a jackleg when a small rock (approx. 2") fell from above and contacted their left eyebrow area. The rock caused a small laceration requiring 6 sutures to close.
Verbal Hazard Complaint Inspections · 3.5 on-site hours
57.14100(b) · $151.00 proposed
57.4602 · $151.00 proposed
57.9301 · S&S · $2,312.00 proposed
57.12006 · S&S · $2,312.00 proposed
57.12018 · S&S · $2,312.00 proposed
50.11(b)(8)
57.3200 · S&S · $2,712.00 proposed
57.4360(a) · $165.00 proposed
57.12018 · S&S · $9,004.00 proposed
Verbal Hazard Complaint Inspections · 9.5 on-site hours
57.4104(b)(1) · $642.00 proposed
57.14101(a)(3) · S&S · $959.00 proposed
57.12006 · S&S · $3,184.00 proposed
57.3360 · S&S · $1,550.00 proposed
Safety sources and definitions
MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-17.
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.
—
Sibanye Stillwater LimitedcontrolsStillwater Mining CompanyoperatesEAST BOULDER MINE
msha-controller-operator-history · controller/operator co-tenure derived on mine 2401879—
Stillwater Mining CompanycontrolsStillwater Mining CompanyoperatesEAST BOULDER MINE
msha-controller-operator-history · controller/operator co-tenure derived on mine 2401879—
Manville Corp Et AlcontrolsStillwater Pgm ResourcesoperatesEAST BOULDER MINE
msha-controller-operator-history · controller/operator co-tenure derived on mine 2401879Other 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
540 historical accident/injury rows; 0 coded fatalities and 14,741 lost days across the published record.
ACCIDENT + INJURY RECORD91 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
2,782 violation rows across the full record; 492 carry an S&S flag and $1,051,108 appears in current assessed amounts.
ENFORCEMENT ACTIVITY782 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
399 personal; 23 area. 47 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 EXPOSURE422 samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
168K employee hours and 367 summed average employees across reported subunits in the latest published quarter.
2002-Q40 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
424 contested-violation rows, 424 civil-penalty docket/decision rows, and 39 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE887 linked rows
conferencescontested-violationscivil-penalty-dockets-decisions06 / 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 CONTEXT45 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
305 inspection events and 36K published inspection hours across the historical record.
OVERSIGHT COVERAGE99 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 17, 2026. 10 silica records across the mine’s published history.
Personal silica samples · concentration / limit
Quarterly mean · published C/E ratio
— No eligible measurements. * Quarter in progress. Means describe the available samples, not average exposure across the mine.
Quartz % is the sample’s quartz content; µg/m³ is its reported concentration. Personal C/E is the ratio to the limit published with that sample. Personal and area concentration units and void status are not specified in those source files.
| Date / sample | Dataset / analyte | Occupation / area | Measurement | Sample status | Published action |
|---|---|---|---|---|---|
| 000000202601788400 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Crusher Oper/Worker | 0× published limitConcentration: 0000.46 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F02988F |
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.
Not present in the 2024 EIA coal workbook.
This can mean the operation is non-coal, inactive for the annual period, or outside the EIA-7A reporting population.
30 CFR 57.12032Inspection and cover plates.3 recent rows ↗30 CFR 57.4504Fan installations.1 recent row ↗30 CFR 57.5066Maintenance standards.1 recent row ↗30 CFR 57.14107Moving machine parts.1 recent row ↗30 CFR 57.14100Safety defects; examination, correction and records.1 recent row ↗30 CFR 57.4602Gauges and regulators.1 recent row ↗30 CFR 57.9301Dump site restraints.1 recent row ↗30 CFR 57.12006Distribution boxes.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
505626157.12032Citation
505626057.12032S&S
505625957.4504(b)Citation
505625857.5066(a)Citation
505625757.14107(a)Citation
505625657.12032Citation
521124157.14100(b)Citation
505625557.4602Citation
Coal dust, noise and other contaminants. Silica records above ↑
Lead fumesFlotation/Concentrator Oper.
C/E: 00.00Concentration: 0000.00 · limit: 0150.00Source unit unspecified
Lead fumesFlotation/Concentrator Oper.
C/E: 00.00Concentration: 0000.00 · limit: 0150.00Source unit unspecified
TC @ 160Mucking Mach. Operator
C/E: 00.67Concentration: 0107.00 · limit: 0160.00Source unit unspecified
EC @ 160Mucking Mach. Operator
C/E: 00.54Concentration: 0086.00 · limit: 0160.00Source unit unspecified
ORGANIC CARBONMiner, Drift
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
EC @ 160Miner, Drift
C/E: 00.36Concentration: 0057.00 · limit: 0160.00Source unit unspecified
TC from EC @ 160Miner, Drift
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
TC from EC @ 160Mucking Mach. Operator
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
16 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors540Jan 24, 2000—Sep 2, 2026mine-keyed
Addresses of Recordidentity · logistics1Mar 2, 1998—Mar 2, 1998mine-keyed
Assessed Violationscompliance · legal2,762Jan 25, 2000—Jul 30, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal424Jul 23, 2002—Oct 8, 2026mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal39Jan 4, 2001—Apr 27, 2023mine-keyed
Contested Violationscompliance · legal424Mar 2, 2004—Apr 3, 2026mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety7,554Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety1,673Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance3May 1, 1990—Sep 5, 1996mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance48Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance108Not published—Not publishedmine-keyed
Inspectionssafety · compliance305Jan 25, 2000—Aug 19, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety23Sep 19, 2017—Jul 12, 2026mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety399May 22, 2001—Jul 23, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal2,782Jan 25, 2000—Jul 30, 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.