# Sparta, WI Plant

- **MSHA mine ID:** 4703644
- **Status:** Active
- **Type / commodity:** Surface / Sand, Industrial NEC
- **Location:** Monroe, WI
- **Operator:** U.S.Silica Energy Company
- **Controller:** USS Holdings Inc
- **Public source rows linked:** 975
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**USS Holdings Inc (M11007) → U.S.Silica Energy Company (0202753) → Sparta, WI Plant (4703644)**

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

## Controller and operator valid-time history

- **USS Holdings Inc → U S Silica Company:** 2012-04-10 through 2025-03-27; derived from co-tenure at mine 4703644; source `msha-controller-operator-history`.
- **USS Holdings Inc → U.S.Silica Energy Company:** 2025-03-28 through current/open; derived from co-tenure at mine 4703644; source `msha-controller-operator-history`.

- History rows: 2
- Typed edges: 6
- 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 — 2 since 2021:** Accidents and injuries 19 historical accident/injury rows; 0 coded fatalities and 73 lost days across the published record.
2. **COMPLIANCE — 9 since 2021:** Violations and penalties 41 violation rows across the full record; 9 carry an S&S flag and $6,162 appears in current assessed amounts.
3. **HEALTH — 50 samples:** Occupational health samples 49 personal; 1 area. 2 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 — 15 linked rows:** Contests, conferences and decisions 6 contested-violation rows, 6 civil-penalty docket/decision rows, and 3 conference records linked by issuance number.
6. **CONTRACTORS — 4 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 — 13 since 2021:** Inspections 39 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 56.4501 — Fuel lines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4501
- **30 CFR 56.4201 — Inspection.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4201
- **30 CFR 56.11003 — Construction and maintenance of ladders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11003
- **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 56.12025 — Grounding circuit enclosures.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12025
- **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 56.12004 — 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 56.20003 — 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 56.12013 — Splices and repairs of power cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12013
- **30 CFR 56.11001 — Safe access.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11001
- **30 CFR 56.16007 — Taglines, hitches, and slings.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16007

## Source coverage

- **Accident, Injuries, and Illnesses:** 19 rows; 2012-06-14 through 2025-02-20; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2022-10-17 through 2022-10-17; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 1 rows; 2017-08-31 through 2017-08-31; source ID `msha-area-samples`
- **Assessed Violations:** 38 rows; 2012-09-13 through 2024-01-17; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 6 rows; 2014-05-07 through 2019-08-23; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 3 rows; 2014-03-31 through 2026-03-20; source ID `msha-conferences`
- **Contested Violations:** 6 rows; 2013-05-07 through 2019-02-13; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 618 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 120 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 2 rows; 2012-04-10 through 2025-03-28; source ID `msha-controller-operator-history`
- **Inspections:** 39 rows; 2012-09-13 through 2026-05-12; source ID `msha-inspections`
- **Mine Employment and Production — Yearly:** 31 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:** 49 rows; 2013-02-27 through 2026-01-07; source ID `msha-personal-health-samples`
- **Violations:** 41 rows; 2012-09-13 through 2026-01-06; 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/sparta-wi-plant-4703644`
- JSON: `/api/v1/mines/sparta-wi-plant-4703644`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4703644/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4703644/relationships`
- MCP resource: `mine://4703644/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`