# NORTH BRIDGEPORT QUARRY

- **MSHA mine ID:** 4103360
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** Wise, TX
- **Operator:** Martin Marietta Materials Soutwest, LLC
- **Controller:** Martin Marietta Materials Inc
- **Public source rows linked:** 4,154
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Martin Marietta Materials Inc (M00174) → Martin Marietta Materials Soutwest, LLC (0084984) → NORTH BRIDGEPORT QUARRY (4103360)**

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

## Controller and operator valid-time history

- **John R  Marriott et al → Marock Inc:** 1986-01-01 through 1990-01-30; derived from co-tenure at mine 4103360; source `msha-controller-operator-history`.
- **Connie  Spradley → Marock Inc:** 1990-01-31 through 1999-09-03; derived from co-tenure at mine 4103360; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Materials Of Texas Incorporated:** 1999-09-04 through 2006-04-30; derived from co-tenure at mine 4103360; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Materials, Inc.:** 2006-05-01 through 2025-05-08; derived from co-tenure at mine 4103360; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Materials Soutwest, LLC:** 2025-05-09 through current/open; derived from co-tenure at mine 4103360; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 15
- 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: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 7 since 2021:** Accidents and injuries 51 historical accident/injury rows; 0 coded fatalities and 734 lost days across the published record.
2. **COMPLIANCE — 44 since 2021:** Violations and penalties 136 violation rows across the full record; 26 carry an S&S flag and $18,296 appears in current assessed amounts.
3. **HEALTH — 47 samples:** Occupational health samples 47 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 28K employee hours and 66 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 27 linked rows:** Contests, conferences and decisions 2 contested-violation rows, 8 civil-penalty docket/decision rows, and 17 conference records linked by issuance number.
6. **CONTRACTORS — 17 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 — 15 since 2021:** Inspections 76 inspection events and 2K 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 56.11012 — Protection for openings around travelways.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11012
- **30 CFR 56.9300 — Berms or guardrails.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9300
- **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 56.14207 — Parking procedures for unattended equipment.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14207
- **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 56.12004 — 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 56.14100 — Safety defects; examination, correction and records.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **30 CFR 56.12032 — Inspection and cover plates.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032

## Source coverage

- **Accident, Injuries, and Illnesses:** 51 rows; 2000-01-06 through 2026-03-23; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1986-01-17 through 1986-01-17; source ID `msha-addresses`
- **Assessed Violations:** 125 rows; 2000-05-09 through 2025-10-08; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 8 rows; 2001-10-11 through 2017-07-26; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 17 rows; 2000-12-06 through 2013-04-12; source ID `msha-conferences`
- **Contested Violations:** 2 rows; 2009-05-12 through 2016-10-13; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 2,950 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 656 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 1986-01-01 through 2025-05-09; source ID `msha-controller-operator-history`
- **Inspections:** 76 rows; 2000-05-03 through 2026-08-31; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 25 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:** 47 rows; 2001-09-12 through 2025-02-04; source ID `msha-personal-health-samples`
- **Violations:** 136 rows; 2000-05-09 through 2026-08-31; 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/north-bridgeport-quarry-4103360`
- JSON: `/api/v1/mines/north-bridgeport-quarry-4103360`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4103360/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4103360/relationships`
- MCP resource: `mine://4103360/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`