# AA Limestone

- **MSHA mine ID:** 1517923
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** Carter, KY
- **Operator:** Heidelberg Materials Midwest Agg, Inc.
- **Controller:** Heidelberg Materials AG
- **Public source rows linked:** 1,989
- **Source coverage:** 14 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Heidelberg Materials AG (M00004) → Heidelberg Materials Midwest Agg, Inc. (L16286) → AA Limestone (1517923)**

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

## Controller and operator valid-time history

- **Carolyn K  Spencer → Aa Limestone Inc:** 1997-04-01 through 1999-03-14; derived from co-tenure at mine 1517923; source `msha-controller-operator-history`.
- **Davon Inc → Aa Limestone-Div/Davon Inc:** 1999-03-15 through 2001-03-30; derived from co-tenure at mine 1517923; source `msha-controller-operator-history`.
- **Hanson PLC → Hanson Aggregates Davon, LLC:** 2001-03-31 through 2007-08-22; derived from co-tenure at mine 1517923; source `msha-controller-operator-history`.
- **Heidelberg Materials AG → Hanson Aggregates Davon, LLC:** 2007-08-23 through 2023-03-15; derived from co-tenure at mine 1517923; source `msha-controller-operator-history`.
- **Heidelberg Materials AG → Heidelberg Materials Midwest Agg, Inc.:** 2023-03-16 through current/open; derived from co-tenure at mine 1517923; source `msha-controller-operator-history`.
- **Hanson PLC → Heidelberg Materials Midwest Agg, Inc.:** 2023-03-16 through 2007-08-22; derived from co-tenure at mine 1517923; source `msha-controller-operator-history`.

- History rows: 6
- Typed edges: 15
- 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 — 2 since 2021:** Accidents and injuries 15 historical accident/injury rows; 0 coded fatalities and 350 lost days across the published record.
2. **COMPLIANCE — 38 since 2021:** Violations and penalties 122 violation rows across the full record; 28 carry an S&S flag and $32,541 appears in current assessed amounts.
3. **HEALTH — 39 samples:** Occupational health samples 39 personal. 1 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 12K employee hours and 17 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 8 linked rows:** Contests, conferences and decisions 4 contested-violation rows, 4 civil-penalty docket/decision rows, and 0 conference records linked by issuance number.
6. **CONTRACTORS — 8 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 81 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 56.20003 — Housekeeping.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **30 CFR 56.11001 — Safe access.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11001
- **30 CFR 56.12008 — Insulation and fittings for power wires and cables.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12008
- **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 56.14132 — Horns and backup alarms.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132
- **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 56.14100 — Safety defects; examination, correction and records.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **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
- **30 CFR 56.7002 — Equipment defects.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-F/section-56.7002

## Source coverage

- **Accident, Injuries, and Illnesses:** 15 rows; 2000-01-05 through 2023-03-08; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1998-10-01 through 1998-10-01; source ID `msha-addresses`
- **Assessed Violations:** 122 rows; 2000-06-27 through 2026-06-26; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2011-06-16 through 2013-10-30; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 4 rows; 2009-08-31 through 2013-04-17; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,021 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 235 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 6 rows; 1997-04-01 through 2023-03-16; source ID `msha-controller-operator-history`
- **Inspections:** 81 rows; 2000-01-24 through 2026-06-24; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 268 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 70 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:** 39 rows; 2001-12-20 through 2026-02-06; source ID `msha-personal-health-samples`
- **Violations:** 122 rows; 2000-06-27 through 2026-06-26; 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/aa-limestone-1517923`
- JSON: `/api/v1/mines/aa-limestone-1517923`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1517923/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1517923/relationships`
- MCP resource: `mine://1517923/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`