# Brighton Plant

- **MSHA mine ID:** 0504258
- **Status:** Abandoned
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Adams, CO
- **Operator:** Aggregate Industries WCR Inc
- **Controller:** Amrize Ltd
- **Public source rows linked:** 393
- **Source coverage:** 12 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Amrize Ltd (0193740) → Aggregate Industries WCR Inc (L17266) → Brighton Plant (0504258)**

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

## Controller and operator valid-time history

- **David W  Hammer → D H Holding Inc:** 1987-10-01 through 1999-01-29; derived from co-tenure at mine 0504258; source `msha-controller-operator-history`.
- **Aggregate Industries PLC → Aggregate Industries WCR Inc:** 1999-01-30 through 2009-04-29; derived from co-tenure at mine 0504258; source `msha-controller-operator-history`.
- **Holcim Ltd → Aggregate Industries WCR Inc:** 2009-04-30 through 2015-07-09; derived from co-tenure at mine 0504258; source `msha-controller-operator-history`.
- **Holcim Ltd → Aggregate Industries WCR Inc:** 2015-07-10 through 2025-06-22; derived from co-tenure at mine 0504258; source `msha-controller-operator-history`.
- **Amrize Ltd → Aggregate Industries WCR Inc:** 2025-06-23 through current/open; derived from co-tenure at mine 0504258; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 12
- 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 — 0 since 2021:** Accidents and injuries 4 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 39 violation rows across the full record; 3 carry an S&S flag and $3,935 appears in current assessed amounts.
3. **HEALTH — 2 samples:** Occupational health samples 2 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 522 employee hours and 3 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 0 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 civil-penalty docket/decision rows, and 0 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 — 0 since 2021:** Inspections 12 inspection events and 226 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 56.4101 — Warning signs.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4101
- **30 CFR 56.14107 — Moving machine parts.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **30 CFR 56.14101 — Brakes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14101
- **30 CFR 56.9300 — Berms or guardrails.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9300
- **30 CFR 56.12008 — Insulation and fittings for power wires and cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12008
- **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 56.12030 — 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 56.18002 — Examination of working places.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18002
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 4 rows; 2007-04-25 through 2010-06-16; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2012-01-18 through 2012-01-18; source ID `msha-addresses`
- **Assessed Violations:** 38 rows; 2000-01-05 through 2011-03-22; source ID `msha-assessed-violations`
- **Contractor Employment and Production — Quarterly:** 153 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 42 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 1987-10-01 through 1999-01-30; source ID `msha-controller-operator-history`
- **Inspections:** 12 rows; 2000-01-05 through 2011-03-18; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 74 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 22 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:** 2 rows; 2009-09-23 through 2009-09-23; source ID `msha-personal-health-samples`
- **Violations:** 39 rows; 2000-01-05 through 2011-03-22; 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/brighton-plant-0504258`
- JSON: `/api/v1/mines/brighton-plant-0504258`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0504258/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0504258/relationships`
- MCP resource: `mine://0504258/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`