# Durham Mine & Mill

- **MSHA mine ID:** 1301225
- **Status:** Active
- **Type / commodity:** Underground / Crushed, Broken Limestone NEC
- **Location:** Marion, IA
- **Operator:** Martin Marietta Materials, Inc.
- **Controller:** Martin Marietta Materials Inc
- **Public source rows linked:** 4,866
- **Source coverage:** 16 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Martin Marietta Materials Inc (M00174) → Martin Marietta Materials, Inc. (L16197) → Durham Mine & Mill (1301225)**

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

## Controller and operator valid-time history

- **Martin Marietta Materials Inc et al → Kaser Corp:** 1950-01-01 through 1997-09-04; derived from co-tenure at mine 1301225; source `msha-controller-operator-history`.
- **Kaser Corporation et al → Kaser Corp:** 1950-01-01 through 1997-09-04; derived from co-tenure at mine 1301225; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Aggregates Of Southern Iowa Inc:** 1997-09-05 through 2006-07-12; derived from co-tenure at mine 1301225; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Materials, Inc.:** 2006-07-13 through current/open; derived from co-tenure at mine 1301225; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 10
- 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: 2026-10-13T11:19:05.459773+00:00.

## Assessment signals

1. **SAFETY — 4 since 2021:** Accidents and injuries 27 historical accident/injury rows; 0 coded fatalities and 603 lost days across the published record.
2. **COMPLIANCE — 40 since 2021:** Violations and penalties 424 violation rows across the full record; 99 carry an S&S flag and $130,791 appears in current assessed amounts.
3. **HEALTH — 385 samples:** Occupational health samples 362 personal; 23 area. 41 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 19K employee hours and 33 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 53 linked rows:** Contests, conferences and decisions 22 contested-violation rows, 22 civil-penalty docket/decision rows, and 9 conference records linked by issuance number.
6. **CONTRACTORS — 14 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 — 26 since 2021:** Inspections 159 inspection events and 5K 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 57.12004 — Electrical conductors.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12004
- **30 CFR 57.15030 — Provision and maintenance of self-rescue devices.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-N/section-57.15030
- **30 CFR 57.15031 — Location of self-rescue devices.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-N/section-57.15031
- **30 CFR 57.14112 — Construction and maintenance of guards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14112
- **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 56.14101 — Brakes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14101
- **30 CFR 57.11053 — Escape and evacuation plans.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-J/section-57.11053
- **30 CFR 57.8520 — Ventilation plan.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-G/section-57.8520
- **30 CFR 62.120 — Action level.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-M/part-62/section-62.120

## Source coverage

- **Accident, Injuries, and Illnesses:** 27 rows; 2000-02-09 through 2025-08-14; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1976-04-28 through 1976-04-28; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 23 rows; 2008-08-19 through 2024-11-20; source ID `msha-area-samples`
- **Assessed Violations:** 419 rows; 2000-04-19 through 2025-10-28; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 22 rows; 2012-02-23 through 2017-09-20; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 9 rows; 2000-04-03 through 2021-02-17; source ID `msha-conferences`
- **Contested Violations:** 22 rows; 2011-04-05 through 2017-03-08; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 2,404 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 545 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1950-01-01 through 2006-07-13; source ID `msha-controller-operator-history`
- **Inspections:** 159 rows; 2000-01-19 through 2026-07-06; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 360 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 84 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:** 362 rows; 2002-09-10 through 2025-10-29; source ID `msha-personal-health-samples`
- **Violations:** 424 rows; 2000-04-19 through 2025-10-28; 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/durham-mine-mill-1301225`
- JSON: `/api/v1/mines/durham-mine-mill-1301225`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1301225/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1301225/relationships`
- MCP resource: `mine://1301225/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`