MINE DETAILS
Big Island Mine & Refinery
MSHA MINE ID4800154
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Big Island Mine & Refinery41.72056, -109.68278Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-18. MSHA quarterly production and employment reports.
Coal production
0reported short tons
Hours worked
1,271,632reported employee hours
Tons per hour
0.00production ÷ 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 | 0 | 224,418 | 0.00 | 459 | 1/1 mines reporting |
| 2025 Q2 | 0 | 216,991 | 0.00 | 448 | 1/1 mines reporting |
| 2025 Q3 | 0 | 207,643 | 0.00 | 447 | 1/1 mines reporting |
| 2025 Q4 | 0 | 201,835 | 0.00 | 443 | 1/1 mines reporting |
| 2026 Q1 | 0 | 212,038 | 0.00 | 444 | 1/1 mines reporting |
| 2026 Q2 | 0 | 208,707 | 0.00 | 444 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-18
Violations
1398 significant & substantial (S&S)
Accident records
50 records classified as fatality
Proposed penalties · USD
33,968.00131 of 139 violations with amounts
On-site inspection hours
1,580.2581 inspections · 81 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 | 12 | 0 | 2,099.00 | 0 | 0 | 10 | 179.8 |
| 2025-Q2 | 22 | 2 | 4,883.00 | 3 | 0 | 13 | 271.8 |
| 2025-Q3 | 30 | 0 | 7,058.00 | 0 | 0 | 11 | 165.0 |
| 2025-Q4 | 28 | 2 | 9,354.00 | 0 | 0 | 12 | 252.3 |
| 2026-Q1 | 12 | 0 | 1,882.00 | 0 | 0 | 12 | 250.8 |
| 2026-Q2 | 23 | 3 | 4,422.00 | 1 | 0 | 11 | 281.5 |
| 2026-Q3 | 12 | 1 | 4,270.00 | 1 | 0 | 11 | 174.8 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 1 | 4.5 |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
57.14112(a)(1) · $165.00 proposed
57.12032 · $151.00 proposed
57.14112(a)(1) · $165.00 proposed
57.14205 · $151.00 proposed
103(i) Spot Inspections · 3.0 on-site hours
57.16006 · $165.00 proposed
103(i) Spot Inspections · 1.5 on-site hours
103(i) Spot Inspections · 2.0 on-site hours
Regular Safety and Health Inspection · 199.8 on-site hours
103(i) Spot Inspections · 2.0 on-site hours
57.5001(a)/57.5005
103(i) Spot Inspections · 1.0 on-site hours
Spot Inspection · 12.0 on-site hours
57.12004 · $151.00 proposed
57.4361(a) · $1,126.00 proposed
49.6(b)
57.14107(a) · $209.00 proposed
57.14112(a)(1) · $151.00 proposed
57.12004 · $151.00 proposed
57.11053(c) · $1,679.00 proposed
57.14100(d) · $151.00 proposed
57.14100(d) · S&S · $1,431.00 proposed
48.7(a) · S&S · $480.00 proposed
57.16005 · $151.00 proposed
47.41(a) · $151.00 proposed
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.
—
Natural Resource Partners LP et alcontrolsSisecam Wyoming, LLCoperatesBig Island Mine & Refinery
msha-controller-operator-history · controller/operator co-tenure derived on mine 4800154—
Ciner Resources LP et alcontrolsSisecam Wyoming, LLCoperatesBig Island Mine & Refinery
msha-controller-operator-history · controller/operator co-tenure derived on mine 4800154—
Anadarko Petroleum Corp et alcontrolsSisecam Wyoming, LLCoperatesBig Island Mine & Refinery
msha-controller-operator-history · controller/operator co-tenure derived on mine 4800154—
OCI Company, Ltd. et alcontrolsSisecam Wyoming, LLCoperatesBig Island Mine & Refinery
msha-controller-operator-history · controller/operator co-tenure derived on mine 4800154—
Rhone-Poulenc S AcontrolsRhone-Poulenc Of Wyoming L PoperatesBig Island Mine & Refinery
msha-controller-operator-history · controller/operator co-tenure derived on mine 4800154—
Unilever United States InccontrolsStauffer Chemical Company Of WyomingoperatesBig Island Mine & Refinery
msha-controller-operator-history · controller/operator co-tenure derived on mine 4800154Other 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
241 historical accident/injury rows; 2 coded fatalities and 3,458 lost days across the published record.
ACCIDENT + INJURY RECORD18 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
2,005 violation rows across the full record; 331 carry an S&S flag and $720,643 appears in current assessed amounts.
ENFORCEMENT ACTIVITY506 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
255 personal; 7 area. 10 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 EXPOSURE262 samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
209K employee hours and 444 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
95 contested-violation rows, 96 civil-penalty docket/decision rows, and 142 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE333 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 CONTEXT54 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
1,190 inspection events and 27K published inspection hours across the historical record.
OVERSIGHT COVERAGE272 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 18, 2026. 70 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 |
|---|---|---|---|---|---|
| 000000202603475000 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Belt Crew | 0.25× published limitConcentration: 0000.63 · limit: 0002.56Source unit unspecified | Not reported | NO ACTIONInspection F03CC85 |
| 000000202603475100 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Belt Crew | 0× published limitConcentration: 0000.52 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F03CC85 |
| 000000202603475200 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Belt Crew | 0× published limitConcentration: 0000.41 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F03CC85 |
| 000000202601606600 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Cleanup Man | 0× published limitConcentration: 0000.52 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F014CED |
| 000000202601562200 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Mechanic | 0.31× published limitConcentration: 0000.88 · limit: 0002.86Source unit unspecified | Not reported | NO ACTIONInspection F014CED |
| 000000202601562300 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Mechanic | 0.43× published limitConcentration: 0001.16 · limit: 0002.70Source unit unspecified | Not reported | NO ACTIONInspection F014CED |
| 000000202601562400 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Mechanic | 0× published limitConcentration: 0000.67 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F014CED |
| 000000202601562500 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Mechanic | 0.51× published limitConcentration: 0001.37 · limit: 0002.70Source unit unspecified | Not reported | NO ACTIONInspection F014CED |
| 000000202601091900 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Roof Bolter, Mounted | 0.74× published limitConcentration: 0002.31 · limit: 0003.13Source unit unspecified | Not reported | NO ACTIONInspection F02708A |
| 000000202600465300 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Crusher Oper/Worker | 0× published limitConcentration: 0000.47 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F0264E8 |
| 000000202600465600 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Dump Operator | 0× published limitConcentration: 0000.53 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F0264E8 |
| 000000202600403100 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Shuttle Car Operator (diesel) | 0.89× published limitConcentration: 0002.71 · limit: 0003.03Source unit unspecified | Not reported | NO ACTIONInspection F0264E8 |
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 57.22227Approved testing devices (I-A, I-B, I-C, II-A, II-B, III, IV, V-A, and V-B mines).1 recent row ↗30 CFR 57.4201Inspection.2 recent rows ↗30 CFR 47.41Requirement for container labels.1 recent row ↗30 CFR 57.22305Approved equipment (III mines).1 recent row ↗30 CFR 57.14112Construction and maintenance of guards.1 recent row ↗30 CFR 57.12028Testing grounding systems.1 recent row ↗30 CFR 57.4102Spillage and leakage.1 recent row ↗30 CFR 57.12004Electrical conductors.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
505169757.22227(a)S&S
505169657.4201(a)(1)Citation
505169547.41(a)Citation
505747357.22305Citation
505169457.14112(a)(1)Citation
505169357.12028Citation
505169257.4102Citation
990678057.12004Citation
Coal dust, noise and other contaminants. Silica records above ↑
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% QtzCleanup Man
C/E: 00.00Concentration: 0000.42 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzUtility Man
C/E: 00.00Concentration: 0000.93 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzUtility Man
C/E: 00.00Concentration: 0001.03 · 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 · contractors241Jan 24, 2000—Sep 21, 2026mine-keyed
Addresses of Recordidentity · logistics1Jul 4, 1976—Jul 4, 1976mine-keyed
Assessed Violationscompliance · legal1,972Mar 2, 2000—Aug 26, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal96Oct 31, 2001—Jul 24, 2025mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal142Apr 7, 2000—Oct 14, 2026mine-keyed
Contested Violationscompliance · legal95Apr 11, 2005—Jul 20, 2024mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety9,336Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety1,907Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance6Jan 1, 1950—Mar 1, 1996mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance424Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance108Not published—Not publishedmine-keyed
Inspectionssafety · compliance1,190Jan 12, 2000—Oct 5, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety7Dec 18, 2018—Dec 12, 2025mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety255Jan 23, 2003—Aug 25, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal2,005Mar 2, 2000—Aug 26, 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.