# Amrize Presque Isle Aggregates

- **MSHA mine ID:** 2000051
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** Presque Isle, MI
- **Operator:** Amrize Great Lakes Inc.
- **Controller:** Amrize Ltd
- **Public source rows linked:** 3,700
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Amrize Ltd (0193740) → Amrize Great Lakes Inc. (L16652) → Amrize Presque Isle Aggregates (2000051)**

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

## Controller and operator valid-time history

- **LTV Steel Co et al → Presque Isle Corp:** 1950-01-01 through 2000-06-30; derived from co-tenure at mine 2000051; source `msha-controller-operator-history`.
- **Lafarge S A → Presque Isle Corp:** 2000-07-01 through 2010-10-31; derived from co-tenure at mine 2000051; source `msha-controller-operator-history`.
- **Lafarge S A → Lafarge North America Inc.:** 2010-11-01 through 2015-07-09; derived from co-tenure at mine 2000051; source `msha-controller-operator-history`.
- **Holcim Ltd → Lafarge North America Inc.:** 2015-07-10 through 2022-04-30; derived from co-tenure at mine 2000051; source `msha-controller-operator-history`.
- **Holcim Ltd → Amrize Great Lakes Inc.:** 2022-05-01 through 2025-06-22; derived from co-tenure at mine 2000051; source `msha-controller-operator-history`.
- **Lafarge S A → Amrize Great Lakes Inc.:** 2022-05-01 through 2015-07-09; derived from co-tenure at mine 2000051; source `msha-controller-operator-history`.
- **Amrize Ltd → Amrize Great Lakes Inc.:** 2025-06-23 through current/open; derived from co-tenure at mine 2000051; source `msha-controller-operator-history`.

- History rows: 7
- Typed edges: 18
- 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 — 3 since 2021:** Accidents and injuries 94 historical accident/injury rows; 0 coded fatalities and 1,968 lost days across the published record.
2. **COMPLIANCE — 120 since 2021:** Violations and penalties 678 violation rows across the full record; 79 carry an S&S flag and $190,310 appears in current assessed amounts.
3. **HEALTH — 94 samples:** Occupational health samples 94 personal. 1 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 60K employee hours and 124 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 60 linked rows:** Contests, conferences and decisions 23 contested-violation rows, 23 civil-penalty docket/decision rows, and 14 conference records linked by issuance number.
6. **CONTRACTORS — 10 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 — 21 since 2021:** Inspections 112 inspection events and 6K 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 56.14207 — 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
- **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 56.12018 — 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 56.11010 — Stairstep clearance.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11010
- **30 CFR 56.4500 — Heat sources.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4500
- **30 CFR 56.14105 — Procedures during repairs or maintenance.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14105
- **30 CFR 56.4104 — Combustible waste.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4104
- **30 CFR 56.4200 — General requirements.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4200
- **30 CFR 56.16006 — Protection of gas cylinder valves.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16006
- **30 CFR 56.14109 — Unguarded conveyors with adjacent travelways.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14109
- **30 CFR 56.4601 — Oxygen cylinder storage.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4601
- **30 CFR 56.16005 — Securing gas cylinders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16005

## Source coverage

- **Accident, Injuries, and Illnesses:** 94 rows; 2000-01-12 through 2025-02-28; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2014-01-06 through 2014-01-06; source ID `msha-addresses`
- **Assessed Violations:** 678 rows; 2000-02-09 through 2026-06-18; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 23 rows; 2009-05-14 through 2022-12-02; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 14 rows; 2007-07-27 through 2024-10-25; source ID `msha-conferences`
- **Contested Violations:** 23 rows; 2007-06-27 through 2025-12-18; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,504 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 354 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 7 rows; 1950-01-01 through 2022-05-01; source ID `msha-controller-operator-history`
- **Inspections:** 112 rows; 2000-02-08 through 2026-06-10; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 36 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 81 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:** 94 rows; 2003-01-08 through 2024-08-09; source ID `msha-personal-health-samples`
- **Violations:** 678 rows; 2000-02-09 through 2026-06-18; 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/amrize-presque-isle-aggregates-2000051`
- JSON: `/api/v1/mines/amrize-presque-isle-aggregates-2000051`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/2000051/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/2000051/relationships`
- MCP resource: `mine://2000051/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`