# Plant #28

- **MSHA mine ID:** 4703084
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** La Crosse, WI
- **Operator:** Milestone Materials Div/Mathy Construction
- **Controller:** Mathy Construction Company
- **Public source rows linked:** 505
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Mathy Construction Company (M00893) → Milestone Materials Div/Mathy Construction (L16472) → Plant #28 (4703084)**

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

## Controller and operator valid-time history

- **Mathy Construction Company → Milestone Materials Div/Mathy Construction:** 1996-08-01 through current/open; derived from co-tenure at mine 4703084; source `msha-controller-operator-history`.

- History rows: 1
- Typed edges: 3
- 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 — 3 since 2021:** Accidents and injuries 6 historical accident/injury rows; 0 coded fatalities and 22 lost days across the published record.
2. **COMPLIANCE — 2 since 2021:** Violations and penalties 29 violation rows across the full record; 8 carry an S&S flag and $3,045 appears in current assessed amounts.
3. **HEALTH — 16 samples:** Occupational health samples 16 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 6 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 14 linked rows:** Contests, conferences and decisions 5 contested-violation rows, 5 civil-penalty docket/decision rows, and 4 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 — 13 since 2021:** Inspections 46 inspection events and 475 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 56.12018 — Identification of power switches.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12018
- **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 56.15005 — Safety belts and lines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15005
- **30 CFR 46.3 — Training plans.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.3
- **30 CFR 56.11003 — Construction and maintenance of ladders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11003
- **30 CFR 46.5 — New miner training.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.5
- **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 56.4101 — Warning signs.** (1 retained recent row) — 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.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107

## Source coverage

- **Accident, Injuries, and Illnesses:** 6 rows; 2001-06-05 through 2025-08-28; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2021-04-29 through 2021-04-29; source ID `msha-addresses`
- **Assessed Violations:** 29 rows; 2000-08-22 through 2025-07-10; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 5 rows; 2019-01-08 through 2024-09-13; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 4 rows; 2016-06-09 through 2016-06-09; source ID `msha-conferences`
- **Contested Violations:** 5 rows; 2016-05-16 through 2024-03-29; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 134 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 29 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 1 rows; 1996-08-01 through 1996-08-01; source ID `msha-controller-operator-history`
- **Inspections:** 46 rows; 2000-06-29 through 2026-05-13; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 169 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 30 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:** 16 rows; 2000-08-22 through 2026-05-14; source ID `msha-personal-health-samples`
- **Violations:** 29 rows; 2000-08-22 through 2025-07-10; 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/plant-28-4703084`
- JSON: `/api/v1/mines/plant-28-4703084`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4703084/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4703084/relationships`
- MCP resource: `mine://4703084/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`