# North Indianapolis Underground Quarry

- **MSHA mine ID:** 1201993
- **Status:** NonProducing
- **Type / commodity:** Underground / Crushed, Broken Limestone NEC
- **Location:** Hamilton, IN
- **Operator:** Martin Marietta Materials Inc
- **Controller:** Martin Marietta Materials Inc
- **Public source rows linked:** 2,537
- **Source coverage:** 16 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Martin Marietta Materials Inc (M00174) → Martin Marietta Materials Inc (L16197) → North Indianapolis Underground Quarry (1201993)**

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

## Controller and operator valid-time history

- **American Aggregates Corp → American Aggregates Corp:** 1986-12-01 through 1987-02-28; derived from co-tenure at mine 1201993; source `msha-controller-operator-history`.
- **Consolidated Gold Fields Limited → American Aggregates Corp:** 1987-03-01 through 1989-08-09; derived from co-tenure at mine 1201993; source `msha-controller-operator-history`.
- **Hanson PLC → American Aggregates Corp:** 1989-08-10 through 1990-02-01; derived from co-tenure at mine 1201993; source `msha-controller-operator-history`.
- **CSR Ltd → American Aggregates Corp:** 1990-02-02 through 1997-05-27; derived from co-tenure at mine 1201993; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Aggregates:** 1997-05-28 through 2002-06-03; derived from co-tenure at mine 1201993; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Materials, Inc.:** 2002-06-04 through 2003-02-20; derived from co-tenure at mine 1201993; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Aggregates:** 2003-02-21 through 2005-05-19; derived from co-tenure at mine 1201993; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Materials Inc:** 2005-05-20 through current/open; derived from co-tenure at mine 1201993; source `msha-controller-operator-history`.

- History rows: 8
- Typed edges: 21
- 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 — 1 since 2021:** Accidents and injuries 17 historical accident/injury rows; 0 coded fatalities and 273 lost days across the published record.
2. **COMPLIANCE — 72 since 2021:** Violations and penalties 190 violation rows across the full record; 63 carry an S&S flag and $76,343 appears in current assessed amounts.
3. **HEALTH — 254 samples:** Occupational health samples 229 personal; 25 area. 28 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 8K employee hours and 15 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 21 linked rows:** Contests, conferences and decisions 10 contested-violation rows, 10 civil-penalty docket/decision rows, and 1 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 — 35 since 2021:** Inspections 142 inspection events and 3K 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 57.3200 — Correction of hazardous conditions.** (4 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-B/section-57.3200
- **30 CFR 57.4500 — Heat sources.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-C/section-57.4500
- **30 CFR 57.6306 — Loading, blasting, and security.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-E/section-57.6306
- **30 CFR 57.11051 — Escape routes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-J/section-57.11051
- **30 CFR 57.3360 — Ground support use.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-B/section-57.3360
- **30 CFR 57.14100 — Safety defects; examination, correction and records.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14100
- **30 CFR 57.12008 — Insulation and fittings for power wires and cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12008
- **30 CFR 57.12030 — Correction of dangerous conditions.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12030
- **30 CFR 57.12001 — Circuit overload protection.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12001

## Source coverage

- **Accident, Injuries, and Illnesses:** 17 rows; 2000-10-03 through 2024-10-10; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2026-08-17 through 2026-08-17; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 25 rows; 2008-09-24 through 2026-08-10; source ID `msha-area-samples`
- **Assessed Violations:** 187 rows; 2000-06-28 through 2026-04-15; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 10 rows; 2012-10-10 through 2021-10-05; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 1 rows; 2015-02-03 through 2015-02-03; source ID `msha-conferences`
- **Contested Violations:** 10 rows; 2011-10-11 through 2021-04-27; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,335 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 342 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 8 rows; 1986-12-01 through 2005-05-20; source ID `msha-controller-operator-history`
- **Inspections:** 142 rows; 2000-01-13 through 2026-08-03; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 12 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 27 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:** 229 rows; 2002-07-30 through 2026-08-10; source ID `msha-personal-health-samples`
- **Violations:** 190 rows; 2000-06-28 through 2026-04-15; 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-indianapolis-underground-quarry-1201993`
- JSON: `/api/v1/mines/north-indianapolis-underground-quarry-1201993`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1201993/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1201993/relationships`
- MCP resource: `mine://1201993/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`