# Minntac Mine

- **MSHA mine ID:** 2100282
- **Status:** Active
- **Type / commodity:** Surface / Iron Ore
- **Location:** St Louis, MN
- **Operator:** United States Steel Corp-Minnesota Ore Operations
- **Controller:** USX Corp (United States Steel Corp)
- **Public source rows linked:** 16,682
- **Source coverage:** 16 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**USX Corp (United States Steel Corp) (M00222) → United States Steel Corp-Minnesota Ore Operations (L09505) → Minntac Mine (2100282)**

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

## Controller and operator valid-time history

- **USX Corp (United States Steel Corp) → United States Steel Corp-Minnesota Ore Operations:** 1950-01-01 through current/open; derived from co-tenure at mine 2100282; source `msha-controller-operator-history`.

- History rows: 1
- Typed edges: 3
- 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 — 100 since 2021:** Accidents and injuries 339 historical accident/injury rows; 0 coded fatalities and 4,317 lost days across the published record.
2. **COMPLIANCE — 1,270 since 2021:** Violations and penalties 4,346 violation rows across the full record; 841 carry an S&S flag and $4,616,719 appears in current assessed amounts.
3. **HEALTH — 433 samples:** Occupational health samples 320 personal; 113 area. 32 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 519K employee hours and 996 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 2,329 linked rows:** Contests, conferences and decisions 1,137 contested-violation rows, 1,138 civil-penalty docket/decision rows, and 54 conference records linked by issuance number.
6. **CONTRACTORS — 29 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 — 80 since 2021:** Inspections 250 inspection events and 22K 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 56.12032 — Inspection and cover plates.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032
- **30 CFR 56.11012 — Protection for openings around travelways.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11012
- **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 56.20003 — Housekeeping.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **30 CFR 56.12004 — Electrical conductors.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **30 CFR 56.14107 — Moving machine parts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 339 rows; 2000-01-07 through 2026-09-22; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1987-10-01 through 1987-10-01; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 113 rows; 2008-07-10 through 2026-03-12; source ID `msha-area-samples`
- **Assessed Violations:** 4,322 rows; 2000-08-03 through 2026-05-18; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 1,138 rows; 2007-04-10 through 2026-09-30; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 54 rows; 2001-02-05 through 2025-04-29; source ID `msha-conferences`
- **Contested Violations:** 1,137 rows; 2006-02-17 through 2026-04-28; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 3,585 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 809 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 1 rows; 1950-01-01 through 1950-01-01; source ID `msha-controller-operator-history`
- **Inspections:** 250 rows; 2000-03-22 through 2026-08-18; 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:** 320 rows; 2002-02-26 through 2026-02-26; source ID `msha-personal-health-samples`
- **Violations:** 4,346 rows; 2000-08-03 through 2026-05-18; 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/minntac-mine-2100282`
- JSON: `/api/v1/mines/minntac-mine-2100282`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/2100282/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/2100282/relationships`
- MCP resource: `mine://2100282/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`