# 443 CRUSHER

- **MSHA mine ID:** 2003161
- **Status:** Abandoned
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Chippewa, MI
- **Operator:** Montgomery Aggregate Products Company
- **Controller:** William E  Montgomery
- **Public source rows linked:** 22
- **Source coverage:** 8 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**William E  Montgomery (M12642) → Montgomery Aggregate Products Company (L16523) → 443 CRUSHER (2003161)**

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

## Controller and operator valid-time history

- **George  Piippo → Stony Ridge Inc:** 2000-07-01 through 2001-04-03; derived from co-tenure at mine 2003161; source `msha-controller-operator-history`.
- **William E  Montgomery → Montgomery Aggregate Products Company:** 2001-04-04 through current/open; derived from co-tenure at mine 2003161; source `msha-controller-operator-history`.

- History rows: 2
- Typed edges: 6
- 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 0 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 6 violation rows across the full record; 4 carry an S&S flag and $1,361 appears in current assessed amounts.
3. **HEALTH — 2 samples:** Occupational health samples 2 personal. 2 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 0 employee hours and 0 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 — 0 since 2021:** Inspections 3 inspection events and 46 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 56.5001 — Exposure limits for airborne contaminants.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-D/section-56.5001
- **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 56.14107 — 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 56.12032 — 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

## Source coverage

- **Addresses of Record:** 1 rows; 2001-06-06 through 2001-06-06; source ID `msha-addresses`
- **Assessed Violations:** 6 rows; 2000-08-01 through 2000-09-26; source ID `msha-assessed-violations`
- **Controller and Operator History:** 2 rows; 2000-07-01 through 2001-04-04; source ID `msha-controller-operator-history`
- **Inspections:** 3 rows; 2000-07-24 through 2001-06-06; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 1 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Metal and Nonmetal Personal Health Samples:** 2 rows; 2000-08-02 through 2000-08-02; source ID `msha-personal-health-samples`
- **Violations:** 6 rows; 2000-08-01 through 2000-09-26; 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/443-crusher-2003161`
- JSON: `/api/v1/mines/443-crusher-2003161`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/2003161/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/2003161/relationships`
- MCP resource: `mine://2003161/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`