# Plant # 1

- **MSHA mine ID:** 2301929
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** De Kalb, MO
- **Operator:** Martin Marietta Materials, Inc.
- **Controller:** Martin Marietta Materials Inc
- **Public source rows linked:** 869
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Martin Marietta Materials Inc (M00174) → Martin Marietta Materials, Inc. (L16197) → Plant # 1 (2301929)**

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

## Controller and operator valid-time history

- **Everett Holding Co  et al → Everett Quarries Company Inc:** 1985-07-01 through 2011-07-17; derived from co-tenure at mine 2301929; source `msha-controller-operator-history`.
- **Clarkson Construction Co et al → Everett Quarries Company Inc:** 1985-07-01 through 2011-07-17; derived from co-tenure at mine 2301929; source `msha-controller-operator-history`.
- **Ashland Inc → APAC- Kansas, Inc.:** 2011-07-18 through 2006-08-27; derived from co-tenure at mine 2301929; source `msha-controller-operator-history`.
- **CRH PLC → APAC- Kansas, Inc.:** 2011-07-18 through 2016-05-19; derived from co-tenure at mine 2301929; source `msha-controller-operator-history`.
- **Con-Agg Llc → Con-Agg Companies, LLC:** 2016-05-20 through 2010-09-14; derived from co-tenure at mine 2301929; source `msha-controller-operator-history`.
- **Summit Materials LLC → Con-Agg Companies, LLC:** 2016-05-20 through 2026-03-23; derived from co-tenure at mine 2301929; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Materials, Inc.:** 2026-03-24 through current/open; derived from co-tenure at mine 2301929; source `msha-controller-operator-history`.

- History rows: 7
- Typed edges: 17
- Interval anomalies: 2
- 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 — 2 since 2021:** Accidents and injuries 13 historical accident/injury rows; 0 coded fatalities and 137 lost days across the published record.
2. **COMPLIANCE — 17 since 2021:** Violations and penalties 95 violation rows across the full record; 29 carry an S&S flag and $19,439 appears in current assessed amounts.
3. **HEALTH — 33 samples:** Occupational health samples 33 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 7K employee hours and 11 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 26 linked rows:** Contests, conferences and decisions 7 contested-violation rows, 11 civil-penalty docket/decision rows, and 8 conference records linked by issuance number.
6. **CONTRACTORS — 5 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 — 19 since 2021:** Inspections 73 inspection events and 1K 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 56.4203 — Extinguisher recharging or replacement.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4203
- **30 CFR 56.4201 — Inspection.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4201
- **30 CFR 56.14112 — Construction and maintenance of guards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **30 CFR 56.3200 — Correction of hazardous conditions.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-B/section-56.3200
- **30 CFR 56.9300 — Berms or guardrails.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9300
- **30 CFR 56.7002 — Equipment defects.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-F/section-56.7002
- **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 56.12032 — 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
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 13 rows; 2001-05-08 through 2024-06-25; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2019-10-01 through 2019-10-01; source ID `msha-addresses`
- **Assessed Violations:** 91 rows; 2000-03-07 through 2026-03-12; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 11 rows; 2001-01-16 through 2020-09-29; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 8 rows; 2018-05-21 through 2026-01-29; source ID `msha-conferences`
- **Contested Violations:** 7 rows; 2009-06-09 through 2025-09-15; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 136 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 38 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 7 rows; 1985-07-01 through 2026-03-24; source ID `msha-controller-operator-history`
- **Inspections:** 73 rows; 2000-03-07 through 2026-09-02; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 281 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 74 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:** 33 rows; 2004-03-24 through 2025-07-09; source ID `msha-personal-health-samples`
- **Violations:** 95 rows; 2000-03-07 through 2026-09-02; 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-1-2301929`
- JSON: `/api/v1/mines/plant-1-2301929`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/2301929/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/2301929/relationships`
- MCP resource: `mine://2301929/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`