# Riverside Stone

- **MSHA mine ID:** 1500081
- **Status:** NonProducing
- **Type / commodity:** Underground / Crushed, Broken Limestone NEC
- **Location:** Meade, KY
- **Operator:** Mulzer Crushed Stone, Inc
- **Controller:** CRH PLC
- **Public source rows linked:** 4,387
- **Source coverage:** 16 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**CRH PLC (M06183) → Mulzer Crushed Stone, Inc (L00309) → Riverside Stone (1500081)**

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

## Controller and operator valid-time history

- **Pat A  Yager → Yager Materials LLC:** 1950-01-01 through 2019-01-30; derived from co-tenure at mine 1500081; source `msha-controller-operator-history`.
- **Carmeuse Holding SA → Yager Materials LLC:** 2019-01-31 through 2019-06-30; derived from co-tenure at mine 1500081; source `msha-controller-operator-history`.
- **Carmeuse Holding SA → Yager Materials Corp.:** 2019-07-01 through 2024-10-31; derived from co-tenure at mine 1500081; source `msha-controller-operator-history`.
- **Bart  Mulzer et al → Mulzer Crushed Stone, Inc:** 2024-11-01 through 2017-02-09; derived from co-tenure at mine 1500081; source `msha-controller-operator-history`.
- **CRH PLC → Mulzer Crushed Stone, Inc:** 2024-11-01 through current/open; derived from co-tenure at mine 1500081; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 13
- 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: 2026-10-13T11:19:05.459773+00:00.

## Assessment signals

1. **SAFETY — 6 since 2021:** Accidents and injuries 51 historical accident/injury rows; 0 coded fatalities and 738 lost days across the published record.
2. **COMPLIANCE — 142 since 2021:** Violations and penalties 844 violation rows across the full record; 291 carry an S&S flag and $339,941 appears in current assessed amounts.
3. **HEALTH — 426 samples:** Occupational health samples 401 personal; 25 area. 50 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 — 44 linked rows:** Contests, conferences and decisions 19 contested-violation rows, 16 civil-penalty docket/decision rows, and 9 conference records linked by issuance number.
6. **CONTRACTORS — 7 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 — 36 since 2021:** Inspections 200 inspection events and 8K 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 57.14100 — Safety defects; examination, correction and records.** (4 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14100
- **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 57.14107 — Moving machine parts.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14107
- **30 CFR 57.11001 — Safe access.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-J/section-57.11001
- **30 CFR 57.12032 — Inspection and cover plates.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12032
- **30 CFR 57.14101 — Brakes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14101
- **30 CFR 57.12004 — Electrical conductors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12004

## Source coverage

- **Accident, Injuries, and Illnesses:** 51 rows; 2000-02-03 through 2023-05-22; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2026-09-15 through 2026-09-15; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 25 rows; 2010-04-07 through 2023-10-18; source ID `msha-area-samples`
- **Assessed Violations:** 836 rows; 2000-02-08 through 2026-02-10; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 16 rows; 2006-12-29 through 2026-06-11; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 9 rows; 2003-06-18 through 2021-11-17; source ID `msha-conferences`
- **Contested Violations:** 19 rows; 2005-08-30 through 2025-07-15; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,152 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 300 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 1950-01-01 through 2024-11-01; source ID `msha-controller-operator-history`
- **Inspections:** 200 rows; 2000-02-07 through 2026-09-15; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 424 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 103 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:** 401 rows; 2001-02-22 through 2023-12-12; source ID `msha-personal-health-samples`
- **Violations:** 844 rows; 2000-02-08 through 2026-02-10; 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/riverside-stone-1500081`
- JSON: `/api/v1/mines/riverside-stone-1500081`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1500081/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1500081/relationships`
- MCP resource: `mine://1500081/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`