# Three Forks Mill

- **MSHA mine ID:** 2400162
- **Status:** Active
- **Type / commodity:** Facility / Talc
- **Location:** Gallatin, MT
- **Operator:** Magris Talc USA Inc.
- **Controller:** Magris Performance Materials Inc
- **Public source rows linked:** 2,422
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Magris Performance Materials Inc (0160541) → Magris Talc USA Inc. (0175353) → Three Forks Mill (2400162)**

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

## Controller and operator valid-time history

- **Cyprus Mines Corp → Cyprus Industrial Minerals Company:** 1950-01-01 through 1980-09-21; derived from co-tenure at mine 2400162; source `msha-controller-operator-history`.
- **Cyprus Amax Minerals Company → Cyprus Industrial Minerals Company:** 1980-09-22 through 1992-06-30; derived from co-tenure at mine 2400162; source `msha-controller-operator-history`.
- **Rio Tinto Group → Imerys Talc Incorporated:** 1992-07-01 through 2011-07-31; derived from co-tenure at mine 2400162; source `msha-controller-operator-history`.
- **Imerys S A → Imerys Talc Incorporated:** 2011-08-01 through 2021-02-16; derived from co-tenure at mine 2400162; source `msha-controller-operator-history`.
- **Magris Performance Materials Inc → Magris Talc USA Inc.:** 2021-02-17 through current/open; derived from co-tenure at mine 2400162; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 14
- 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 — 22 since 2021:** Accidents and injuries 68 historical accident/injury rows; 0 coded fatalities and 1,223 lost days across the published record.
2. **COMPLIANCE — 50 since 2021:** Violations and penalties 301 violation rows across the full record; 28 carry an S&S flag and $63,536 appears in current assessed amounts.
3. **HEALTH — 53 samples:** Occupational health samples 53 personal. 0 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 40K employee hours and 76 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 16 linked rows:** Contests, conferences and decisions 4 contested-violation rows, 4 civil-penalty docket/decision rows, and 8 conference records linked by issuance number.
6. **CONTRACTORS — 9 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 — 17 since 2021:** Inspections 74 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 56.15001 — First-aid materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15001
- **30 CFR 56.12035 — Weatherproof lamp sockets.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12035
- **30 CFR 56.14201 — Conveyor start-up warnings.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14201
- **30 CFR 56.20003 — Housekeeping.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **30 CFR 56.17001 — Illumination of surface working areas.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-P/section-56.17001
- **30 CFR 56.11003 — Construction and maintenance of ladders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11003
- **30 CFR 56.9315 — Dust control.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9315
- **30 CFR 56.12016 — Work on electrically-powered equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12016
- **30 CFR 56.12028 — Testing grounding systems.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12028
- **30 CFR 56.20011 — Barricades and warning signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20011

## Source coverage

- **Accident, Injuries, and Illnesses:** 68 rows; 2000-03-06 through 2025-09-29; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1974-05-15 through 1974-05-15; source ID `msha-addresses`
- **Assessed Violations:** 301 rows; 2000-06-21 through 2026-05-28; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2010-04-21 through 2011-04-04; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 8 rows; 2008-07-31 through 2024-12-18; source ID `msha-conferences`
- **Contested Violations:** 4 rows; 2009-01-14 through 2009-07-16; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,113 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 223 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 1950-01-01 through 2021-02-17; source ID `msha-controller-operator-history`
- **Inspections:** 74 rows; 2000-06-21 through 2026-09-18; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 212 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 54 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:** 53 rows; 2003-01-23 through 2026-09-18; source ID `msha-personal-health-samples`
- **Violations:** 301 rows; 2000-06-21 through 2026-05-28; 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/three-forks-mill-2400162`
- JSON: `/api/v1/mines/three-forks-mill-2400162`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/2400162/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/2400162/relationships`
- MCP resource: `mine://2400162/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`