# Lotawana Quarry

- **MSHA mine ID:** 2301889
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** Jackson, MO
- **Operator:** Martin Marietta Materials, Inc.
- **Controller:** Martin Marietta Materials Inc
- **Public source rows linked:** 2,764
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Martin Marietta Materials Inc (M00174) → Martin Marietta Materials, Inc. (L16197) → Lotawana Quarry (2301889)**

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

## Controller and operator valid-time history

- **Barber & Sons Company → Barber & Sons Aggregate:** 1984-02-01 through 2019-09-15; derived from co-tenure at mine 2301889; source `msha-controller-operator-history`.
- **N R  Hamm → N R Hamm Quarry LLC:** 2019-09-16 through 2012-02-08; derived from co-tenure at mine 2301889; source `msha-controller-operator-history`.
- **Summit Materials LLC → N R Hamm Quarry LLC:** 2019-09-16 through 2026-03-22; derived from co-tenure at mine 2301889; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Materials, Inc.:** 2026-03-23 through current/open; derived from co-tenure at mine 2301889; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 11
- 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 — 5 since 2021:** Accidents and injuries 11 historical accident/injury rows; 0 coded fatalities and 155 lost days across the published record.
2. **COMPLIANCE — 26 since 2021:** Violations and penalties 484 violation rows across the full record; 179 carry an S&S flag and $396,312 appears in current assessed amounts.
3. **HEALTH — 73 samples:** Occupational health samples 73 personal. 12 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 10K employee hours and 18 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 348 linked rows:** Contests, conferences and decisions 171 contested-violation rows, 170 civil-penalty docket/decision rows, and 7 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 — 19 since 2021:** Inspections 103 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 56.14100 — 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 56.12004 — 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 56.12013 — Splices and repairs of power cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12013
- **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
- **30 CFR 56.14112 — Construction and maintenance of guards.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **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 56.14207 — 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
- **30 CFR 46.9 — Records of training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.9
- **30 CFR 56.18002 — Examination of working places.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18002

## Source coverage

- **Accident, Injuries, and Illnesses:** 11 rows; 2000-01-29 through 2024-01-03; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2019-09-18 through 2019-09-18; source ID `msha-addresses`
- **Assessed Violations:** 473 rows; 2000-05-11 through 2026-05-05; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 170 rows; 2010-01-08 through 2026-02-10; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 7 rows; 2020-12-03 through 2023-10-16; source ID `msha-conferences`
- **Contested Violations:** 171 rows; 2007-07-31 through 2023-10-12; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 722 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 186 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1984-02-01 through 2026-03-23; source ID `msha-controller-operator-history`
- **Inspections:** 103 rows; 2000-05-11 through 2026-05-13; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 283 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 75 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:** 73 rows; 2001-06-13 through 2025-06-17; source ID `msha-personal-health-samples`
- **Violations:** 484 rows; 2000-05-11 through 2026-05-05; 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/lotawana-quarry-2301889`
- JSON: `/api/v1/mines/lotawana-quarry-2301889`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/2301889/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/2301889/relationships`
- MCP resource: `mine://2301889/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`