# Kennecott Keystone Underground

- **MSHA mine ID:** 4201392
- **Status:** Active
- **Type / commodity:** Underground / Copper Ore NEC
- **Location:** Salt Lake, UT
- **Operator:** Kennecott Utah Copper LLC
- **Controller:** Rio Tinto Group
- **Public source rows linked:** 8,294
- **Source coverage:** 16 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Rio Tinto Group (M01812) → Kennecott Utah Copper LLC (L11154) → Kennecott Keystone Underground (4201392)**

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

## Controller and operator valid-time history

- **Kennecott Copper Corp → Kennecott Minerals Company:** 1950-01-01 through 1981-06-03; derived from co-tenure at mine 4201392; source `msha-controller-operator-history`.
- **British Petroleum Company PLC → Kennecott/New Mines Development Division:** 1981-06-04 through 2006-05-07; derived from co-tenure at mine 4201392; source `msha-controller-operator-history`.
- **Rio Tinto Group → Kennecott Utah Copper LLC:** 2006-05-08 through current/open; derived from co-tenure at mine 4201392; source `msha-controller-operator-history`.

- History rows: 3
- Typed edges: 9
- 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 60 historical accident/injury rows; 1 coded fatalities and 719 lost days across the published record.
2. **COMPLIANCE — 196 since 2021:** Violations and penalties 277 violation rows across the full record; 36 carry an S&S flag and $352,584 appears in current assessed amounts.
3. **HEALTH — 69 samples:** Occupational health samples 65 personal; 4 area. 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 27K employee hours and 62 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 67 linked rows:** Contests, conferences and decisions 32 contested-violation rows, 32 civil-penalty docket/decision rows, and 3 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 — 48 since 2021:** Inspections 120 inspection events and 4K 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 49.6 — Equipment and maintenance requirements.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-49/subpart-A/section-49.6
- **30 CFR 57.9101 — Operating speeds and control of equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-H/section-57.9101
- **30 CFR 57.12032 — Inspection and cover plates.** (4 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12032
- **30 CFR 57.3200 — Correction of hazardous conditions.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-B/section-57.3200
- **30 CFR 57.14100 — Safety defects; examination, correction and records.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14100
- **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 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 57.6160 — Main facilities.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-E/section-57.6160
- **30 CFR 57.14206 — Securing movable parts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14206

## Source coverage

- **Accident, Injuries, and Illnesses:** 60 rows; 2006-11-07 through 2026-03-12; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2012-08-06 through 2012-08-06; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 4 rows; 2024-05-07 through 2026-08-30; source ID `msha-area-samples`
- **Assessed Violations:** 259 rows; 2006-11-21 through 2026-08-31; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 32 rows; 2013-02-21 through 2026-02-17; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 3 rows; 2023-02-07 through 2026-03-25; source ID `msha-conferences`
- **Contested Violations:** 32 rows; 2012-02-14 through 2026-02-03; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 5,897 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 1,332 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 1950-01-01 through 2006-05-08; source ID `msha-controller-operator-history`
- **Inspections:** 120 rows; 2006-11-21 through 2026-09-10; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 167 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 41 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:** 65 rows; 2012-12-11 through 2026-09-18; source ID `msha-personal-health-samples`
- **Violations:** 277 rows; 2006-11-21 through 2026-08-31; 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/kennecott-keystone-underground-4201392`
- JSON: `/api/v1/mines/kennecott-keystone-underground-4201392`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4201392/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4201392/relationships`
- MCP resource: `mine://4201392/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`