# Hockley Plant

- **MSHA mine ID:** 4103491
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Harris, TX
- **Operator:** Alleyton Resource Company, LLC.
- **Controller:** Summit Materials LLC
- **Public source rows linked:** 552
- **Source coverage:** 14 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Summit Materials LLC (M02046) → Alleyton Resource Company, LLC. (0108226) → Hockley Plant (4103491)**

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

## Controller and operator valid-time history

- **Mid America Materials Company → Hallett Materials:** 1987-10-01 through 2001-08-10; derived from co-tenure at mine 4103491; source `msha-controller-operator-history`.
- **Rasmussen Group Inc → Hallett Materials:** 2001-08-11 through 2021-01-10; derived from co-tenure at mine 4103491; source `msha-controller-operator-history`.
- **Todd  Barten Et Al → Alleyton Resource Company, LLC.:** 2021-01-11 through 2014-01-22; derived from co-tenure at mine 4103491; source `msha-controller-operator-history`.
- **Summit Materials LLC → Alleyton Resource Company, LLC.:** 2021-01-11 through current/open; derived from co-tenure at mine 4103491; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 11
- Interval anomalies: 1
- 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 — 1 since 2021:** Accidents and injuries 2 historical accident/injury rows; 1 coded fatalities and 1 lost days across the published record.
2. **COMPLIANCE — 44 since 2021:** Violations and penalties 97 violation rows across the full record; 28 carry an S&S flag and $33,456 appears in current assessed amounts.
3. **HEALTH — 10 samples:** Occupational health samples 10 personal. 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 — 0 tons:** Quarterly production and employment 3K employee hours and 4 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 8 linked rows:** Contests, conferences and decisions 4 contested-violation rows, 4 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 — 14 since 2021:** Inspections 57 inspection events and 769 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 56.12018 — 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 47.41 — Requirement for container labels.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.41
- **30 CFR 56.9300 — Berms or guardrails.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9300
- **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 46.11 — Site-specific hazard awareness training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.11
- **30 CFR 56.12028 — Testing grounding systems.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12028
- **30 CFR 56.15001 — First-aid materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15001
- **30 CFR 56.11001 — Safe access.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11001
- **30 CFR 56.18010 — First aid.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18010
- **30 CFR 56.12034 — Guarding around lights.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12034

## Source coverage

- **Accident, Injuries, and Illnesses:** 2 rows; 2012-08-13 through 2023-06-01; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2011-08-23 through 2011-08-23; source ID `msha-addresses`
- **Assessed Violations:** 95 rows; 2000-08-03 through 2026-08-13; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2018-08-03 through 2025-12-23; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 4 rows; 2018-02-21 through 2024-03-06; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 43 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 12 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1987-10-01 through 2021-01-11; source ID `msha-controller-operator-history`
- **Inspections:** 57 rows; 2000-08-03 through 2026-08-13; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 184 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 38 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:** 10 rows; 2006-11-02 through 2025-02-05; source ID `msha-personal-health-samples`
- **Violations:** 97 rows; 2000-08-03 through 2026-08-13; 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/hockley-plant-4103491`
- JSON: `/api/v1/mines/hockley-plant-4103491`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4103491/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4103491/relationships`
- MCP resource: `mine://4103491/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`