# Amrize Fremont Quarry

- **MSHA mine ID:** 0504708
- **Status:** Intermittent
- **Type / commodity:** Surface / Crushed, Broken Stone NEC
- **Location:** Fremont, CO
- **Operator:** Amrize West Central Inc.
- **Controller:** Amrize Ltd
- **Public source rows linked:** 75
- **Source coverage:** 9 / 20
- **Generated:** 2026-10-18T09:31:49.615Z

## Current entity hierarchy

**Amrize Ltd (0193740) → Amrize West Central Inc. (L17266) → Amrize Fremont Quarry (0504708)**

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

## Controller and operator valid-time history

- **Continental Materials Corp → Castle Concrete Co/Transit Mix Concrete:** 2001-04-27 through 2016-03-31; derived from co-tenure at mine 0504708; source `msha-controller-operator-history`.
- **Edward J  Tezak → Rocky Mountain Landscape Materials, LLC:** 2016-04-01 through 2013-08-05; derived from co-tenure at mine 0504708; source `msha-controller-operator-history`.
- **Danny  Tezak et al → Rocky Mountain Landscape Materials, LLC:** 2016-04-01 through 2014-12-31; derived from co-tenure at mine 0504708; source `msha-controller-operator-history`.
- **Kathleen  Tezak et al → Rocky Mountain Landscape Materials, LLC:** 2016-04-01 through 2014-12-31; derived from co-tenure at mine 0504708; source `msha-controller-operator-history`.
- **Rhonda  Lewis et al → Rocky Mountain Landscape Materials, LLC:** 2016-04-01 through 2020-01-31; derived from co-tenure at mine 0504708; source `msha-controller-operator-history`.
- **Danny  Tezak et al → Rocky Mountain Landscape Materials, LLC:** 2016-04-01 through 2020-01-31; derived from co-tenure at mine 0504708; source `msha-controller-operator-history`.
- **Rhonda  Lewis et al → Canon Dolomite Quarry, LLC:** 2020-02-01 through 2023-03-30; derived from co-tenure at mine 0504708; source `msha-controller-operator-history`.
- **Danny  Tezak et al → Canon Dolomite Quarry, LLC:** 2020-02-01 through 2023-03-30; derived from co-tenure at mine 0504708; source `msha-controller-operator-history`.
- **Holcim Ltd → Canon Dolomite Quarry, LLC:** 2023-03-31 through 2023-08-27; derived from co-tenure at mine 0504708; source `msha-controller-operator-history`.
- **Holcim Ltd → Amrize West Central Inc.:** 2023-08-28 through 2025-06-22; derived from co-tenure at mine 0504708; source `msha-controller-operator-history`.
- **Holcim Ltd → Amrize West Central Inc.:** 2023-08-28 through 2015-07-09; derived from co-tenure at mine 0504708; source `msha-controller-operator-history`.
- **Aggregate Industries PLC → Amrize West Central Inc.:** 2023-08-28 through 2009-04-29; derived from co-tenure at mine 0504708; source `msha-controller-operator-history`.
- **Amrize Ltd → Amrize West Central Inc.:** 2025-06-23 through current/open; derived from co-tenure at mine 0504708; source `msha-controller-operator-history`.

- History rows: 13
- Typed edges: 27
- Interval anomalies: 5
- 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: 2026-10-18T09:31:49.615908+00:00.

## Assessment signals

1. **SAFETY — 0 since 2021:** Accidents and injuries 0 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 1 since 2021:** Violations and penalties 2 violation rows across the full record; 0 carry an S&S flag and $265 appears in current assessed amounts.
3. **HEALTH — 3 samples:** Occupational health samples 3 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 65 employee hours and 2 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 — 0 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 — 3 since 2021:** Inspections 8 inspection events and 64 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 56.14101 — 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 56.1000 — Notification of commencement of operations and closing of mines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-A/section-56.1000

## Source coverage

- **Addresses of Record:** 1 rows; 2025-04-09 through 2025-04-09; source ID `msha-addresses`
- **Assessed Violations:** 2 rows; 2016-03-31 through 2025-09-11; source ID `msha-assessed-violations`
- **Controller and Operator History:** 13 rows; 2001-04-27 through 2023-08-28; source ID `msha-controller-operator-history`
- **Inspections:** 8 rows; 2003-06-26 through 2026-08-18; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 35 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 10 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:** 3 rows; 2026-08-19 through 2026-08-19; source ID `msha-personal-health-samples`
- **Violations:** 2 rows; 2016-03-31 through 2025-09-11; 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-fremont-quarry-0504708`
- JSON: `/api/v1/mines/amrize-fremont-quarry-0504708`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0504708/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0504708/relationships`
- MCP resource: `mine://0504708/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`