# Keigley Quarry

- **MSHA mine ID:** 4200021
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Stone NEC
- **Location:** Utah, UT
- **Operator:** Staker & Parson Companies
- **Controller:** CRH PLC
- **Public source rows linked:** 1,034
- **Source coverage:** 14 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**CRH PLC (M06183) → Staker & Parson Companies (0050765) → Keigley Quarry (4200021)**

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:** 1950-01-01 through 1987-08-31; derived from co-tenure at mine 4200021; source `msha-controller-operator-history`.
- **Joseph A  Cannon → Geneva Steel:** 1987-09-01 through 1999-10-14; derived from co-tenure at mine 4200021; source `msha-controller-operator-history`.
- **CRH PLC → Staker Paving & Construction Company Inc:** 1999-10-15 through 2001-03-31; derived from co-tenure at mine 4200021; source `msha-controller-operator-history`.
- **U S Aggregate Inc → Western Aggregates:** 2001-04-01 through 2002-05-29; derived from co-tenure at mine 4200021; source `msha-controller-operator-history`.
- **CRH PLC → Staker & Parson Companies:** 2002-05-30 through current/open; derived from co-tenure at mine 4200021; source `msha-controller-operator-history`.

- History rows: 5
- 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 — 3 since 2021:** Accidents and injuries 11 historical accident/injury rows; 0 coded fatalities and 9 lost days across the published record.
2. **COMPLIANCE — 22 since 2021:** Violations and penalties 71 violation rows across the full record; 12 carry an S&S flag and $18,258 appears in current assessed amounts.
3. **HEALTH — 28 samples:** Occupational health samples 28 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 6K employee hours and 17 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 6 linked rows:** Contests, conferences and decisions 3 contested-violation rows, 3 civil-penalty docket/decision rows, and 0 conference records linked by issuance number.
6. **CONTRACTORS — 5 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 — 12 since 2021:** Inspections 67 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 56.11002 — Handrails and toeboards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11002
- **30 CFR 56.12018 — Identification of power switches.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12018
- **30 CFR 56.14132 — Horns and backup alarms.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132
- **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 56.12002 — Controls and switches.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12002
- **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 56.15005 — Safety belts and lines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15005
- **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 56.11001 — Safe access.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11001
- **30 CFR 56.14207 — Parking procedures for unattended equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14207

## Source coverage

- **Accident, Injuries, and Illnesses:** 11 rows; 2000-01-03 through 2026-01-16; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2014-05-08 through 2014-05-08; source ID `msha-addresses`
- **Assessed Violations:** 70 rows; 2000-01-27 through 2025-04-23; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 3 rows; 2011-08-16 through 2015-06-17; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 3 rows; 2010-02-01 through 2014-11-05; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 393 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 85 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 1950-01-01 through 2002-05-30; source ID `msha-controller-operator-history`
- **Inspections:** 67 rows; 2000-01-27 through 2026-10-07; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 245 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 51 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:** 28 rows; 2000-11-29 through 2025-04-25; source ID `msha-personal-health-samples`
- **Violations:** 71 rows; 2000-01-27 through 2026-10-07; 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/keigley-quarry-4200021`
- JSON: `/api/v1/mines/keigley-quarry-4200021`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4200021/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4200021/relationships`
- MCP resource: `mine://4200021/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`