# US Silica-Voca Plant

- **MSHA mine ID:** 4104855
- **Status:** Abandoned
- **Type / commodity:** Surface / Crushed, Broken Sandstone
- **Location:** Mcculloch, TX
- **Operator:** U. S. Silica Company
- **Controller:** USS Holdings Inc
- **Public source rows linked:** 647
- **Source coverage:** 14 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**USS Holdings Inc (M11007) → U. S. Silica Company (L14417) → US Silica-Voca Plant (4104855)**

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

## Controller and operator valid-time history

- **Kimberly  Bowron et al → Cadre Material Products, LLC:** 2011-02-17 through 2014-07-30; derived from co-tenure at mine 4104855; source `msha-controller-operator-history`.
- **USS Holdings Inc → Cadre Material Products, LLC:** 2014-07-31 through 2019-05-16; derived from co-tenure at mine 4104855; source `msha-controller-operator-history`.
- **USS Holdings Inc → U. S. Silica Company:** 2019-05-17 through current/open; derived from co-tenure at mine 4104855; source `msha-controller-operator-history`.

- History rows: 3
- 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: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 0 since 2021:** Accidents and injuries 30 historical accident/injury rows; 0 coded fatalities and 562 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 61 violation rows across the full record; 10 carry an S&S flag and $17,799 appears in current assessed amounts.
3. **HEALTH — 22 samples:** Occupational health samples 22 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 — 3 linked rows:** Contests, conferences and decisions 1 contested-violation rows, 1 civil-penalty docket/decision rows, and 1 conference records linked by issuance number.
6. **CONTRACTORS — 6 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 — 0 since 2021:** Inspections 23 inspection events and 420 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 56.12028 — 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 56.14130 — Roll-over protective structures (ROPS) and seat belts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14130
- **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 48.28 — Annual refresher training of miners; minimum courses of instruction; hours of instruction.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-48/subpart-B/section-48.28
- **30 CFR 56.4203 — Extinguisher recharging or replacement.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4203
- **30 CFR 56.14205 — Machinery, equipment, and tools.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14205
- **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 56.20011 — Barricades and warning signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20011
- **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 56.20003 — 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 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
- **30 CFR 56.14207 — Parking procedures for unattended equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14207

## Source coverage

- **Accident, Injuries, and Illnesses:** 30 rows; 2011-06-05 through 2018-05-10; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2020-08-25 through 2020-08-25; source ID `msha-addresses`
- **Assessed Violations:** 61 rows; 2011-03-29 through 2019-03-12; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 1 rows; 2015-08-31 through 2015-08-31; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 1 rows; 2018-09-18 through 2018-09-18; source ID `msha-conferences`
- **Contested Violations:** 1 rows; 2015-01-21 through 2015-01-21; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 335 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 80 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 2011-02-17 through 2019-05-17; source ID `msha-controller-operator-history`
- **Inspections:** 23 rows; 2011-03-28 through 2019-03-21; source ID `msha-inspections`
- **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:** 22 rows; 2011-09-08 through 2016-10-12; source ID `msha-personal-health-samples`
- **Violations:** 61 rows; 2011-03-29 through 2019-03-12; 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/us-silica-voca-plant-4104855`
- JSON: `/api/v1/mines/us-silica-voca-plant-4104855`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4104855/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4104855/relationships`
- MCP resource: `mine://4104855/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`