# Yellowtail Mine

- **MSHA mine ID:** 4800607
- **Status:** Active
- **Type / commodity:** Surface / Bentonite
- **Location:** Big Horn, WY
- **Operator:** American Colloid Company
- **Controller:** Minerals Technologies Inc
- **Public source rows linked:** 1,066
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Minerals Technologies Inc (M00362) → American Colloid Company (L00006) → Yellowtail Mine (4800607)**

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

## Controller and operator valid-time history

- **Amcol International Corp → American Colloid Company:** 1950-01-01 through 2014-07-30; derived from co-tenure at mine 4800607; source `msha-controller-operator-history`.
- **Minerals Technologies Inc → American Colloid Company:** 2014-07-31 through current/open; derived from co-tenure at mine 4800607; source `msha-controller-operator-history`.

- History rows: 2
- Typed edges: 5
- 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: 2026-10-13T11:19:05.459773+00:00.

## Assessment signals

1. **SAFETY — 0 since 2021:** Accidents and injuries 6 historical accident/injury rows; 0 coded fatalities and 154 lost days across the published record.
2. **COMPLIANCE — 2 since 2021:** Violations and penalties 49 violation rows across the full record; 6 carry an S&S flag and $5,680 appears in current assessed amounts.
3. **HEALTH — 37 samples:** Occupational health samples 37 personal. 2 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 5K employee hours and 14 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 12 linked rows:** Contests, conferences and decisions 3 contested-violation rows, 3 civil-penalty docket/decision rows, and 6 conference records linked by issuance number.
6. **CONTRACTORS — 4 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 — 13 since 2021:** Inspections 63 inspection events and 1K 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 56.12025 — Grounding circuit enclosures.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12025
- **30 CFR 56.14132 — Horns and backup alarms.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132
- **30 CFR 56.4101 — Warning signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4101
- **30 CFR 41.12 — Changes; notification by operator.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-G/part-41/subpart-B/section-41.12
- **30 CFR 56.14100 — Safety defects; examination, correction and records.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **30 CFR 56.14207 — Parking procedures for unattended equipment.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14207
- **30 CFR 56.12004 — Electrical conductors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **30 CFR 50.20 — Preparation and submission of MSHA Report Form 7000-1—Mine Accident, Injury, and Illness Report.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-C/section-50.20
- **30 CFR 56.9300 — Berms or guardrails.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9300

## Source coverage

- **Accident, Injuries, and Illnesses:** 6 rows; 2001-10-15 through 2016-09-20; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2016-03-07 through 2016-03-07; source ID `msha-addresses`
- **Assessed Violations:** 48 rows; 2000-01-26 through 2026-06-09; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 3 rows; 2010-11-17 through 2010-11-17; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 6 rows; 2000-02-01 through 2020-04-10; source ID `msha-conferences`
- **Contested Violations:** 3 rows; 2009-08-27 through 2009-08-27; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 571 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 123 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 2 rows; 1950-01-01 through 1950-01-01; source ID `msha-controller-operator-history`
- **Inspections:** 63 rows; 2000-01-26 through 2026-06-08; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 124 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 29 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:** 37 rows; 2001-08-08 through 2024-03-06; source ID `msha-personal-health-samples`
- **Violations:** 49 rows; 2000-01-26 through 2026-06-09; 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/yellowtail-mine-4800607`
- JSON: `/api/v1/mines/yellowtail-mine-4800607`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4800607/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4800607/relationships`
- MCP resource: `mine://4800607/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`