# GLENROCK MILL

- **MSHA mine ID:** 4801475
- **Status:** Active
- **Type / commodity:** Surface / Leonardite
- **Location:** Converse, WY
- **Operator:** Black Hills Lignite A Limited Liability Co
- **Controller:** Harvest Holdings II LLC
- **Public source rows linked:** 474
- **Source coverage:** 12 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Harvest Holdings II LLC (0198141) → Black Hills Lignite A Limited Liability Co (L09648) → GLENROCK MILL (4801475)**

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

## Controller and operator valid-time history

- **Thomas A  Thorson et al → Black Hills Lignite A Limited Liability Co:** 1987-08-01 through 2020-01-16; derived from co-tenure at mine 4801475; source `msha-controller-operator-history`.
- **Michael  Farmar et al → Black Hills Lignite A Limited Liability Co:** 2020-01-17 through 2025-06-30; derived from co-tenure at mine 4801475; source `msha-controller-operator-history`.
- **Brad  Knickel et al → Black Hills Lignite A Limited Liability Co:** 2020-01-17 through 2025-06-30; derived from co-tenure at mine 4801475; source `msha-controller-operator-history`.
- **Harvest Holdings II LLC → Black Hills Lignite A Limited Liability Co:** 2025-07-01 through current/open; derived from co-tenure at mine 4801475; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 8
- 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 26 historical accident/injury rows; 0 coded fatalities and 246 lost days across the published record.
2. **COMPLIANCE — 22 since 2021:** Violations and penalties 94 violation rows across the full record; 14 carry an S&S flag and $21,828 appears in current assessed amounts.
3. **HEALTH — 44 samples:** Occupational health samples 38 personal; 6 area. 3 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 4K employee hours and 6 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 1 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 civil-penalty docket/decision rows, and 1 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 78 inspection events and 1K 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 56.15006 — Protective equipment and clothing for hazards and irritants.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15006
- **30 CFR 56.12032 — Inspection and cover plates.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032
- **30 CFR 56.12028 — Testing grounding systems.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12028
- **30 CFR 56.12030 — Correction of dangerous conditions.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12030
- **30 CFR 56.4101 — Warning signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4101
- **30 CFR 56.14205 — Machinery, equipment, and tools.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14205
- **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 56.12018 — Identification of power switches.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12018
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 26 rows; 2000-10-09 through 2019-05-06; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2015-07-14 through 2015-07-14; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 6 rows; 2022-12-08 through 2022-12-08; source ID `msha-area-samples`
- **Assessed Violations:** 92 rows; 2000-01-19 through 2026-03-17; source ID `msha-assessed-violations`
- **Conferences:** 1 rows; 2021-08-31 through 2021-08-31; source ID `msha-conferences`
- **Controller and Operator History:** 4 rows; 1987-08-01 through 1987-08-01; source ID `msha-controller-operator-history`
- **Inspections:** 78 rows; 2000-01-18 through 2026-09-24; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 106 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:** 38 rows; 2004-03-03 through 2026-03-17; source ID `msha-personal-health-samples`
- **Violations:** 94 rows; 2000-01-19 through 2026-09-24; 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/glenrock-mill-4801475`
- JSON: `/api/v1/mines/glenrock-mill-4801475`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4801475/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4801475/relationships`
- MCP resource: `mine://4801475/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`