# Big Island Mine & Refinery

- **MSHA mine ID:** 4800154
- **Status:** Active
- **Type / commodity:** Underground / Trona
- **Location:** Sweetwater, WY
- **Operator:** Sisecam Wyoming, LLC
- **Controller:** Natural Resource Partners LP; Ciner Resources LP
- **Public source rows linked:** 17,410
- **Source coverage:** 16 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Natural Resource Partners LP; Ciner Resources LP (0107927) → Sisecam Wyoming, LLC (L14409) → Big Island Mine & Refinery (4800154)**

Current identity source: `msha-mines`. This is a current snapshot, not a historical claim.

## Controller and operator valid-time history

- **Unilever United States Inc → Stauffer Chemical Company Of Wyoming:** 1950-01-01 through 1987-11-30; derived from co-tenure at mine 4800154; source `msha-controller-operator-history`.
- **Rhone-Poulenc S A → Rhone-Poulenc Of Wyoming L P:** 1987-12-01 through 1996-02-29; derived from co-tenure at mine 4800154; source `msha-controller-operator-history`.
- **Anadarko Petroleum Corp et al → Sisecam Wyoming, LLC:** 1996-03-01 through 2013-01-22; derived from co-tenure at mine 4800154; source `msha-controller-operator-history`.
- **OCI Company, Ltd.  et al → Sisecam Wyoming, LLC:** 1996-03-01 through 2013-01-22; derived from co-tenure at mine 4800154; source `msha-controller-operator-history`.
- **Natural Resource Partners LP et al → Sisecam Wyoming, LLC:** 2013-01-23 through current/open; derived from co-tenure at mine 4800154; source `msha-controller-operator-history`.
- **Ciner Resources LP et al → Sisecam Wyoming, LLC:** 2013-01-23 through current/open; derived from co-tenure at mine 4800154; source `msha-controller-operator-history`.

- History rows: 6
- Typed edges: 13
- Interval anomalies: 0
- Valid-time bounds: inclusive; date granularity; null end means open-ended in the upstream history row; not independent proof of present control.
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 18 since 2021:** Accidents and injuries 241 historical accident/injury rows; 2 coded fatalities and 3,458 lost days across the published record.
2. **COMPLIANCE — 506 since 2021:** 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.
3. **HEALTH — 262 samples:** 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.
4. **PRODUCTION — 0 tons:** Quarterly production and employment 214K employee hours and 412 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 333 linked rows:** Contests, conferences and decisions 95 contested-violation rows, 96 civil-penalty docket/decision rows, and 142 conference records linked by issuance number.
6. **CONTRACTORS — 54 linked entities:** 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.
7. **INSPECTIONS — 272 since 2021:** Inspections 1,190 inspection events and 27K published inspection hours across the historical record.

## EIA annual operating context

No matched record in the 2024 EIA coal-public workbook. This may be inapplicable for a non-coal operation.

## Recent Title 30 crosswalk

Snapshot current through 2026-08-19.

- **30 CFR 57.22227 — Approved testing devices (I-A, I-B, I-C, II-A, II-B, III, IV, V-A, and V-B mines).** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-T/section-57.22227
- **30 CFR 57.4201 — Inspection.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-C/section-57.4201
- **30 CFR 47.41 — Requirement for container labels.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.41
- **30 CFR 57.22305 — Approved equipment (III mines).** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-T/section-57.22305
- **30 CFR 57.14112 — Construction and maintenance of guards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14112
- **30 CFR 57.12028 — Testing grounding systems.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12028
- **30 CFR 57.4102 — Spillage and leakage.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-C/section-57.4102
- **30 CFR 57.12004 — Electrical conductors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12004
- **30 CFR 57.4101 — Warning signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-C/section-57.4101
- **30 CFR 57.14101 — Brakes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14101
- **30 CFR 47.44 — Temporary, portable containers.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.44

## Source coverage

- **Accident, Injuries, and Illnesses:** 241 rows; 2000-01-24 through 2026-09-21; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1976-07-04 through 1976-07-04; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 7 rows; 2018-12-18 through 2025-12-12; source ID `msha-area-samples`
- **Assessed Violations:** 1,972 rows; 2000-03-02 through 2026-08-26; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 96 rows; 2001-10-31 through 2025-07-24; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 142 rows; 2000-04-07 through 2026-10-14; source ID `msha-conferences`
- **Contested Violations:** 95 rows; 2005-04-11 through 2024-07-20; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 9,336 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 1,907 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 6 rows; 1950-01-01 through 1996-03-01; source ID `msha-controller-operator-history`
- **Inspections:** 1,190 rows; 2000-01-12 through 2026-10-05; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 48 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 108 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Metal and Nonmetal Personal Health Samples:** 255 rows; 2003-01-23 through 2026-08-25; source ID `msha-personal-health-samples`
- **Violations:** 2,005 rows; 2000-03-02 through 2026-08-26; source ID `msha-violations`

## Caveats

- This is public-record decision support, not legal advice or an official MSHA record.
- Missing data can indicate no event, publication delay, an unresolved identity, or inapplicability.
- Contractor production data is entity-level and is not attributed to this mine.

## Alternate representations

- HTML: `/mines/big-island-mine-refinery-4800154`
- JSON: `/api/v1/mines/big-island-mine-refinery-4800154`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4800154/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4800154/relationships`
- MCP resource: `mine://4800154/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`