# HC Wyeville Mine

- **MSHA mine ID:** 4703611
- **Status:** Active
- **Type / commodity:** Surface / Sand, Industrial NEC
- **Location:** Monroe, WI
- **Operator:** HC Wyeville Operating LLC
- **Controller:** Iron Oak Energy Solutions LLC
- **Public source rows linked:** 1,360
- **Source coverage:** 12 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Iron Oak Energy Solutions LLC (0189021) → HC Wyeville Operating LLC (0118489) → HC Wyeville Mine (4703611)**

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

## Controller and operator valid-time history

- **Hi-Crush Proppants LLC → HC Wyeville Operating LLC:** 2011-06-18 through 2012-08-22; derived from co-tenure at mine 4703611; source `msha-controller-operator-history`.
- **Hi-Crush Inc → HC Wyeville Operating LLC:** 2012-08-23 through 2024-08-04; derived from co-tenure at mine 4703611; source `msha-controller-operator-history`.
- **HC Minerals Inc → HC Wyeville Operating LLC:** 2024-08-05 through 2025-08-10; derived from co-tenure at mine 4703611; source `msha-controller-operator-history`.
- **Iron Oak Energy Solutions LLC → HC Wyeville Operating LLC:** 2025-08-11 through current/open; derived from co-tenure at mine 4703611; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 9
- 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 — 8 since 2021:** Accidents and injuries 29 historical accident/injury rows; 0 coded fatalities and 150 lost days across the published record.
2. **COMPLIANCE — 37 since 2021:** Violations and penalties 119 violation rows across the full record; 27 carry an S&S flag and $18,289 appears in current assessed amounts.
3. **HEALTH — 53 samples:** Occupational health samples 53 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 — No published quarter:** Quarterly production and employment The source remains registered, but no mine-keyed quarterly production row was published.
5. **LEGAL — 4 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 civil-penalty docket/decision rows, and 4 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 — 21 since 2021:** Inspections 54 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 56.12004 — Electrical conductors.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **30 CFR 56.4200 — General requirements.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4200
- **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 56.12028 — Testing grounding systems.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12028
- **30 CFR 56.4104 — Combustible waste.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4104
- **30 CFR 56.14214 — Train warnings.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14214
- **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 56.12008 — Insulation and fittings for power wires and cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12008
- **30 CFR 56.16005 — Securing gas cylinders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16005
- **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 47.44 — Temporary, portable containers.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.44

## Source coverage

- **Accident, Injuries, and Illnesses:** 29 rows; 2013-05-04 through 2026-07-08; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2011-07-11 through 2011-07-11; source ID `msha-addresses`
- **Assessed Violations:** 118 rows; 2011-08-16 through 2026-03-30; source ID `msha-assessed-violations`
- **Conferences:** 4 rows; 2015-09-09 through 2017-06-14; source ID `msha-conferences`
- **Contractor Employment and Production — Quarterly:** 798 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 147 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 2011-06-18 through 2011-06-18; source ID `msha-controller-operator-history`
- **Inspections:** 54 rows; 2011-08-16 through 2026-05-11; source ID `msha-inspections`
- **Mine Employment and Production — Yearly:** 32 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:** 53 rows; 2011-08-17 through 2026-01-22; source ID `msha-personal-health-samples`
- **Violations:** 119 rows; 2011-08-16 through 2026-03-30; 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/hc-wyeville-mine-4703611`
- JSON: `/api/v1/mines/hc-wyeville-mine-4703611`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4703611/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4703611/relationships`
- MCP resource: `mine://4703611/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`