# Martin Marietta Merkel Plant

- **MSHA mine ID:** 4103848
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Jones, TX
- **Operator:** Martin Marietta Materials Southwest LLC
- **Controller:** Martin Marietta Materials Inc
- **Public source rows linked:** 757
- **Source coverage:** 14 / 20
- **Generated:** 2026-10-18T09:31:49.615Z

## Current entity hierarchy

**Martin Marietta Materials Inc (M00174) → Martin Marietta Materials Southwest LLC (0084984) → Martin Marietta Merkel Plant (4103848)**

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

## Controller and operator valid-time history

- **Ralph E  Janes III → R .E. Janes Gravel Company:** 1994-11-01 through 2013-12-31; derived from co-tenure at mine 4103848; source `msha-controller-operator-history`.
- **Ralph E  Janes IV et al → R .E. Janes Gravel Company:** 2014-01-01 through 2024-12-12; derived from co-tenure at mine 4103848; source `msha-controller-operator-history`.
- **Brian T  Etchison et al → R .E. Janes Gravel Company:** 2014-01-01 through 2024-12-12; derived from co-tenure at mine 4103848; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Materials Southwest LLC:** 2024-12-13 through current/open; derived from co-tenure at mine 4103848; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 9
- 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: 2026-10-18T09:31:49.615908+00:00.

## Assessment signals

1. **SAFETY — 3 since 2021:** Accidents and injuries 10 historical accident/injury rows; 0 coded fatalities and 338 lost days across the published record.
2. **COMPLIANCE — 39 since 2021:** Violations and penalties 66 violation rows across the full record; 8 carry an S&S flag and $24,896 appears in current assessed amounts.
3. **HEALTH — 38 samples:** Occupational health samples 38 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 18K employee hours and 28 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 10 linked rows:** Contests, conferences and decisions 5 contested-violation rows, 5 civil-penalty docket/decision rows, and 0 conference records linked by issuance number.
6. **CONTRACTORS — 3 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 71 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 48.28 — Annual refresher training of miners; minimum courses of instruction; hours of instruction.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-48/subpart-B/section-48.28
- **30 CFR 41.11 — Notification by operator.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-G/part-41/subpart-B/section-41.11
- **30 CFR 56.4402 — Safety can use.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4402
- **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 50.20-1 — General instructions for completing MSHA Form 7000-1.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-C/section-50.20-1
- **30 CFR 56.20003 — Housekeeping.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **30 CFR 56.4203 — Extinguisher recharging or replacement.** (1 retained recent row) — 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 56.12018 — Identification of power switches.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12018
- **30 CFR 56.14207 — Parking procedures for unattended equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14207

## Source coverage

- **Accident, Injuries, and Illnesses:** 10 rows; 2005-05-26 through 2025-10-10; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1995-04-04 through 1995-04-04; source ID `msha-addresses`
- **Assessed Violations:** 62 rows; 2001-10-10 through 2026-05-06; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 5 rows; 2010-05-12 through 2024-09-20; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 5 rows; 2009-05-20 through 2023-12-12; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 174 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 54 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1994-11-01 through 2024-12-13; source ID `msha-controller-operator-history`
- **Inspections:** 71 rows; 2000-01-05 through 2026-10-06; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 212 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 54 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:** 38 rows; 2004-07-21 through 2020-09-23; source ID `msha-personal-health-samples`
- **Violations:** 66 rows; 2001-10-10 through 2026-10-07; 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/martin-marietta-merkel-plant-4103848`
- JSON: `/api/v1/mines/martin-marietta-merkel-plant-4103848`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4103848/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4103848/relationships`
- MCP resource: `mine://4103848/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`