# A24

- **MSHA mine ID:** 1518837
- **Status:** Abandoned
- **Type / commodity:** Surface / Coal (Bituminous)
- **Location:** Martin, KY
- **Operator:** Hendrickson Equipment, Inc.
- **Controller:** Leonard  Hendrickson
- **Public source rows linked:** 270
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Leonard  Hendrickson (C15954) → Hendrickson Equipment, Inc. (P24456) → A24 (1518837)**

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

## Controller and operator valid-time history

- **Leonard  Hendrickson et al → Hendrickson Drilling LLC:** 2004-12-30 through 2010-04-22; derived from co-tenure at mine 1518837; source `msha-controller-operator-history`.
- **Robert  Hendrickson et al → Hendrickson Drilling LLC:** 2004-12-30 through 2010-04-22; derived from co-tenure at mine 1518837; source `msha-controller-operator-history`.
- **Leonard  Hendrickson → Hendrickson Drilling LLC:** 2010-04-23 through 2011-11-08; derived from co-tenure at mine 1518837; source `msha-controller-operator-history`.
- **Ryan  Johns → Rhyno Corp LLC:** 2011-11-09 through 2018-10-11; derived from co-tenure at mine 1518837; source `msha-controller-operator-history`.
- **Leonard  Hendrickson → Hendrickson Equipment, Inc.:** 2018-10-12 through current/open; derived from co-tenure at mine 1518837; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 12
- 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 — 0 since 2021:** Accidents and injuries 0 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 1 since 2021:** Violations and penalties 35 violation rows across the full record; 14 carry an S&S flag and $7,596 appears in current assessed amounts.
3. **HEALTH — 61 samples:** Occupational health samples 37 coal dust; 24 noise. 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 0 employee hours and 0 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 7 linked rows:** Contests, conferences and decisions 1 contested-violation rows, 1 civil-penalty docket/decision rows, and 5 conference records linked by issuance number.
6. **CONTRACTORS — 0 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 — 14 since 2021:** Inspections 41 inspection events and 668 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 77.208 — Storage of materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-C/section-77.208
- **30 CFR 77.1104 — Accumulations of combustible materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-L/section-77.1104
- **30 CFR 77.400 — Mechanical equipment guards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-E/section-77.400
- **30 CFR 71.400 — Bathing facilities; change rooms; sanitary flush toilet facilities.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-71/subpart-E/section-71.400
- **30 CFR 77.1000 — Highwalls, pits and spoil banks; plans.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-K/section-77.1000
- **30 CFR 77.1713 — Daily inspection of surface coal mine; certified person; reports of inspection.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-R/section-77.1713
- **30 CFR 77.1605 — Loading and haulage equipment; installations.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-Q/section-77.1605
- **30 CFR 77.1501 — Auger mining; inspections.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-P/section-77.1501
- **30 CFR 77.1102 — Warning signs; smoking and open flame.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-L/section-77.1102
- **30 CFR 77.1004 — Ground control; inspection and maintenance; general.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-K/section-77.1004
- **30 CFR 77.1100 — Fire protection; training and organization.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-L/section-77.1100

## Source coverage

- **Addresses of Record:** 1 rows; 2025-07-02 through 2025-07-02; source ID `msha-addresses`
- **Assessed Violations:** 35 rows; 2005-02-28 through 2022-08-04; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 1 rows; 2019-09-11 through 2019-09-11; source ID `msha-civil-penalty-dockets-decisions`
- **Coal Dust Samples:** 37 rows; 2005-07-28 through 2023-12-08; source ID `msha-coal-dust-samples`
- **Conferences:** 5 rows; 2006-03-15 through 2011-10-20; source ID `msha-conferences`
- **Contested Violations:** 1 rows; 2019-05-07 through 2019-05-07; source ID `msha-contested-violations`
- **Controller and Operator History:** 5 rows; 2004-12-30 through 2018-10-12; source ID `msha-controller-operator-history`
- **Inspections:** 41 rows; 2005-02-28 through 2025-06-02; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 66 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 18 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Noise Samples:** 24 rows; 2006-02-27 through 2023-12-08; source ID `msha-noise-samples`
- **Violations:** 35 rows; 2005-02-28 through 2022-08-04; 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/a24-1518837`
- JSON: `/api/v1/mines/a24-1518837`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1518837/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1518837/relationships`
- MCP resource: `mine://1518837/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`