# Chelsea Plant

- **MSHA mine ID:** 2000767
- **Status:** Abandoned
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Jackson, MI
- **Operator:** Meyer Material CO, LLC
- **Controller:** Amrize Ltd
- **Public source rows linked:** 395
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Amrize Ltd (0193740) → Meyer Material CO, LLC (L00240) → Chelsea Plant (2000767)**

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

## Controller and operator valid-time history

- **William  Sturgill → Klumpp Brothers Gravel Company:** 1950-01-01 through 1985-04-29; derived from co-tenure at mine 2000767; source `msha-controller-operator-history`.
- **David  Pachota → Chelsea Aggregate Corp:** 1985-04-30 through 1999-01-25; derived from co-tenure at mine 2000767; source `msha-controller-operator-history`.
- **Aggregate Industries PLC → Bill Smith Sand & Gravel:** 2004-06-10 through 2009-04-29; derived from co-tenure at mine 2000767; source `msha-controller-operator-history`.
- **Holcim Ltd → Bill Smith Sand & Gravel:** 2009-04-30 through 2011-07-11; derived from co-tenure at mine 2000767; source `msha-controller-operator-history`.
- **Meyer Material Acquisition Corp Et Al → Meyer Material CO, LLC:** 2011-07-12 through 2011-07-11; derived from co-tenure at mine 2000767; source `msha-controller-operator-history`.
- **Aggregate Industries PLC → Meyer Material CO, LLC:** 2011-07-12 through 2015-07-09; derived from co-tenure at mine 2000767; source `msha-controller-operator-history`.
- **Holcim Ltd → Meyer Material CO, LLC:** 2015-07-10 through 2025-06-22; derived from co-tenure at mine 2000767; source `msha-controller-operator-history`.
- **Amrize Ltd → Meyer Material CO, LLC:** 2025-06-23 through current/open; derived from co-tenure at mine 2000767; source `msha-controller-operator-history`.

- History rows: 8
- Typed edges: 20
- Interval anomalies: 1
- 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: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 0 since 2021:** Accidents and injuries 3 historical accident/injury rows; 0 coded fatalities and 1 lost days across the published record.
2. **COMPLIANCE — 1 since 2021:** Violations and penalties 55 violation rows across the full record; 17 carry an S&S flag and $13,739 appears in current assessed amounts.
3. **HEALTH — 4 samples:** Occupational health samples 4 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 4K employee hours and 7 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 13 linked rows:** Contests, conferences and decisions 6 contested-violation rows, 6 civil-penalty docket/decision rows, and 1 conference records linked by issuance number.
6. **CONTRACTORS — 2 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 — 11 since 2021:** Inspections 48 inspection events and 670 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 56.12028 — Testing grounding systems.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12028
- **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 46.9 — Records of training.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.9
- **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 56.14200 — Warnings prior to starting or moving equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14200
- **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 46.3 — Training plans.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.3
- **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 56.12032 — Inspection and cover plates.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032
- **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 56.11012 — 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

## Source coverage

- **Accident, Injuries, and Illnesses:** 3 rows; 2001-08-15 through 2008-03-21; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2024-09-30 through 2024-09-30; source ID `msha-addresses`
- **Assessed Violations:** 54 rows; 2000-08-04 through 2024-03-14; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 6 rows; 2011-08-18 through 2012-05-31; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 1 rows; 2012-10-03 through 2012-10-03; source ID `msha-conferences`
- **Contested Violations:** 6 rows; 2010-07-28 through 2010-12-01; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 110 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 25 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 8 rows; 1950-01-01 through 2011-07-12; source ID `msha-controller-operator-history`
- **Inspections:** 48 rows; 2000-02-23 through 2024-08-23; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 24 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 49 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:** 4 rows; 2014-09-17 through 2023-09-06; source ID `msha-personal-health-samples`
- **Violations:** 55 rows; 2000-08-04 through 2024-03-14; 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/chelsea-plant-2000767`
- JSON: `/api/v1/mines/chelsea-plant-2000767`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/2000767/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/2000767/relationships`
- MCP resource: `mine://2000767/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`