# Highwall Park Surface Mine

- **MSHA mine ID:** 4609612
- **Status:** Active
- **Type / commodity:** Surface / Coal (Bituminous)
- **Location:** Mercer, WV
- **Operator:** Onyx Energy, LLC
- **Controller:** Mohegan Energy Trustees LLC
- **Public source rows linked:** 293
- **Source coverage:** 14 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Mohegan Energy Trustees LLC (0141301) → Onyx Energy, LLC (0098205) → Highwall Park Surface Mine (4609612)**

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

## Controller and operator valid-time history

- **Mohegan Energy Trustees LLC → Onyx Energy, LLC:** 2021-10-25 through 2024-09-03; derived from co-tenure at mine 4609612; source `msha-controller-operator-history`.
- **Richard G  Preservati II → Onyx Energy, LLC:** 2021-10-25 through 2018-05-15; derived from co-tenure at mine 4609612; source `msha-controller-operator-history`.
- **Bobby  Justus → Monument Mining, Inc.:** 2024-09-04 through 2026-09-15; derived from co-tenure at mine 4609612; source `msha-controller-operator-history`.
- **Mohegan Energy Trustees LLC → Onyx Energy, LLC:** 2026-09-16 through current/open; derived from co-tenure at mine 4609612; source `msha-controller-operator-history`.
- **Richard G  Preservati II → Onyx Energy, LLC:** 2026-09-16 through 2018-05-15; derived from co-tenure at mine 4609612; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 11
- Interval anomalies: 2
- 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 — 0 since 2021:** Accidents and injuries 0 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 38 since 2021:** Violations and penalties 38 violation rows across the full record; 8 carry an S&S flag and $17,642 appears in current assessed amounts.
3. **HEALTH — 70 samples:** Occupational health samples 52 coal dust; 8 coal quartz; 10 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 — No published quarter:** Quarterly production and employment The source remains registered, but no mine-keyed quarterly production row was published.
5. **LEGAL — 2 linked rows:** Contests, conferences and decisions 1 contested-violation rows, 1 civil-penalty docket/decision rows, and 0 conference records linked by issuance number.
6. **CONTRACTORS — 1 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 — 7 since 2021:** Inspections 7 inspection events and 271 published inspection hours across the historical record.

## EIA annual operating context

- **Reporting year:** 2024
- **Production:** 18,985 short tons
- **Labor hours:** 2,057
- **Average employees:** 11
- **Coal supply region:** Appalachia Central
- **Union code:** Not published
- **Published rows under this MSHA ID:** 1

## Recent Title 30 crosswalk

Snapshot current through 2026-08-19.

- **30 CFR 71.206 — Quarterly sampling; designated work positions.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-71/subpart-C/section-71.206
- **30 CFR 77.1606 — Loading and haulage equipment; inspection and maintenance.** (5 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-77/subpart-Q/section-77.1606
- **30 CFR 48.31 — Hazard training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-48/subpart-B/section-48.31
- **30 CFR 50.30 — Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-D/section-50.30
- **30 CFR 71.208 — Respirable dust samples; report to operator; posting.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-O/part-71/subpart-C/section-71.208
- **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

## Source coverage

- **Addresses of Record:** 1 rows; 2024-11-14 through 2024-11-14; source ID `msha-addresses`
- **Assessed Violations:** 37 rows; 2024-12-18 through 2026-06-10; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 1 rows; 2026-06-17 through 2026-06-17; source ID `msha-civil-penalty-dockets-decisions`
- **Coal Dust Samples:** 52 rows; 2025-02-25 through 2026-09-18; source ID `msha-coal-dust-samples`
- **Contested Violations:** 1 rows; 2026-02-18 through 2026-02-18; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 107 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 22 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 2021-10-25 through 2026-09-16; source ID `msha-controller-operator-history`
- **Inspections:** 7 rows; 2024-12-18 through 2026-04-13; source ID `msha-inspections`
- **Mine Employment and Production — Yearly:** 3 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Noise Samples:** 10 rows; 2025-02-25 through 2025-11-05; source ID `msha-noise-samples`
- **Quartz Samples — Coal:** 8 rows; 2025-02-25 through 2026-05-27; source ID `msha-quartz-samples`
- **Violations:** 38 rows; 2024-12-18 through 2026-06-10; 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/highwall-park-surface-mine-4609612`
- JSON: `/api/v1/mines/highwall-park-surface-mine-4609612`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4609612/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4609612/relationships`
- MCP resource: `mine://4609612/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`