# COLONY WEST MILL

- **MSHA mine ID:** 4800245
- **Status:** Active
- **Type / commodity:** Facility / Bentonite
- **Location:** Crook, WY
- **Operator:** American Colloid Company
- **Controller:** Minerals Technologies Inc
- **Public source rows linked:** 1,564
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Minerals Technologies Inc (M00362) → American Colloid Company (L00006) → COLONY WEST MILL (4800245)**

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

## Controller and operator valid-time history

- **Panhandle Eastern Corp → Federal Bentonite Div/Aurora Metal Company:** 1950-01-01 through 1984-05-31; derived from co-tenure at mine 4800245; source `msha-controller-operator-history`.
- **Halliburton Company → Federal Ore & Chemicals Inc:** 1984-06-01 through 1987-03-15; derived from co-tenure at mine 4800245; source `msha-controller-operator-history`.
- **Dresser Industries Inc et al → Federal Ore & Chemicals Inc:** 1987-03-16 through 1987-10-29; derived from co-tenure at mine 4800245; source `msha-controller-operator-history`.
- **Halliburton Co et al → Federal Ore & Chemicals Inc:** 1987-03-16 through 1987-10-29; derived from co-tenure at mine 4800245; source `msha-controller-operator-history`.
- **Amcol International Corp → American Colloid Company:** 1987-10-30 through 2014-07-30; derived from co-tenure at mine 4800245; source `msha-controller-operator-history`.
- **Minerals Technologies Inc → American Colloid Company:** 2014-07-31 through current/open; derived from co-tenure at mine 4800245; source `msha-controller-operator-history`.

- History rows: 6
- Typed edges: 15
- 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 — 5 since 2021:** Accidents and injuries 78 historical accident/injury rows; 0 coded fatalities and 1,048 lost days across the published record.
2. **COMPLIANCE — 21 since 2021:** Violations and penalties 239 violation rows across the full record; 45 carry an S&S flag and $78,531 appears in current assessed amounts.
3. **HEALTH — 35 samples:** Occupational health samples 35 personal. 1 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 19K employee hours and 35 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 80 linked rows:** Contests, conferences and decisions 36 contested-violation rows, 41 civil-penalty docket/decision rows, and 3 conference records linked by issuance number.
6. **CONTRACTORS — 3 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 — 14 since 2021:** Inspections 84 inspection events and 2K 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 56.12030 — Correction of dangerous conditions.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12030
- **30 CFR 56.14100 — Safety defects; examination, correction and records.** (4 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **30 CFR 56.16004 — Containers for hazardous materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16004
- **30 CFR 56.4201 — Inspection.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4201
- **30 CFR 47.41 — Requirement for container labels.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.41
- **30 CFR 56.4402 — Safety can use.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4402
- **30 CFR 56.14130 — Roll-over protective structures (ROPS) and seat belts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14130

## Source coverage

- **Accident, Injuries, and Illnesses:** 78 rows; 2000-01-02 through 2025-09-26; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1987-10-30 through 1987-10-30; source ID `msha-addresses`
- **Assessed Violations:** 238 rows; 2000-03-28 through 2026-05-27; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 41 rows; 2003-04-28 through 2016-01-29; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 3 rows; 2019-11-19 through 2024-02-15; source ID `msha-conferences`
- **Contested Violations:** 36 rows; 2010-04-13 through 2015-06-17; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 460 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 95 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 6 rows; 1950-01-01 through 1987-10-30; source ID `msha-controller-operator-history`
- **Inspections:** 84 rows; 2000-03-28 through 2026-05-26; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 200 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 47 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:** 35 rows; 2004-04-07 through 2026-02-03; source ID `msha-personal-health-samples`
- **Violations:** 239 rows; 2000-03-28 through 2026-05-27; 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/colony-west-mill-4800245`
- JSON: `/api/v1/mines/colony-west-mill-4800245`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4800245/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4800245/relationships`
- MCP resource: `mine://4800245/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`