# Arena Plant

- **MSHA mine ID:** 4101495
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Colorado, TX
- **Operator:** Heidelberg Materials Southwest LLC
- **Controller:** Heidelberg Materials AG
- **Public source rows linked:** 1,321
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Heidelberg Materials AG (M00004) → Heidelberg Materials Southwest LLC (0174514) → Arena Plant (4101495)**

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

## Controller and operator valid-time history

- **Ideal Basic Industries Inc → Thorstenberg Materials Company Inc:** 1950-01-01 through 1989-06-08; derived from co-tenure at mine 4101495; source `msha-controller-operator-history`.
- **Holcim Ltd → Holnam Inc:** 1989-06-09 through 1992-06-25; derived from co-tenure at mine 4101495; source `msha-controller-operator-history`.
- **Pioneer International Ltd → Pioneer South Central Inc:** 1992-06-26 through 2000-08-03; derived from co-tenure at mine 4101495; source `msha-controller-operator-history`.
- **Hanson PLC → Hanson Aggregates Central Inc:** 2000-08-04 through 2004-05-09; derived from co-tenure at mine 4101495; source `msha-controller-operator-history`.
- **Hanson PLC → Hanson Aggregates LLC:** 2004-05-10 through 2007-08-22; derived from co-tenure at mine 4101495; source `msha-controller-operator-history`.
- **Heidelberg Materials AG → Hanson Aggregates LLC:** 2007-08-23 through 2020-12-20; derived from co-tenure at mine 4101495; source `msha-controller-operator-history`.
- **Heidelberg Materials AG → Heidelberg Materials Southwest LLC:** 2021-01-01 through current/open; derived from co-tenure at mine 4101495; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Hanson Aggregates LLC:** 2021-10-01 through 2020-12-20; derived from co-tenure at mine 4101495; source `msha-controller-operator-history`.

- History rows: 8
- Typed edges: 22
- 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 — 0 since 2021:** Accidents and injuries 27 historical accident/injury rows; 0 coded fatalities and 414 lost days across the published record.
2. **COMPLIANCE — 57 since 2021:** Violations and penalties 198 violation rows across the full record; 50 carry an S&S flag and $114,941 appears in current assessed amounts.
3. **HEALTH — 27 samples:** Occupational health samples 27 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 21K employee hours and 30 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 22 linked rows:** Contests, conferences and decisions 8 contested-violation rows, 8 civil-penalty docket/decision rows, and 6 conference records linked by issuance number.
6. **CONTRACTORS — 7 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 — 19 since 2021:** Inspections 85 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 56.12018 — Identification of power switches.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12018
- **30 CFR 56.12032 — Inspection and cover plates.** (4 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032
- **30 CFR 56.14100 — Safety defects; examination, correction and records.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **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 56.20003 — 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 56.16006 — Protection of gas cylinder valves.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16006
- **30 CFR 56.14201 — Conveyor start-up warnings.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14201
- **30 CFR 56.11012 — Protection for openings around travelways.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11012

## Source coverage

- **Accident, Injuries, and Illnesses:** 27 rows; 2002-06-06 through 2019-12-08; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1973-08-02 through 1973-08-02; source ID `msha-addresses`
- **Assessed Violations:** 198 rows; 2000-07-25 through 2026-08-19; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 8 rows; 2011-08-16 through 2018-06-06; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 6 rows; 2001-06-19 through 2001-06-19; source ID `msha-conferences`
- **Contested Violations:** 8 rows; 2010-01-20 through 2017-11-14; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 392 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 96 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 8 rows; 1950-01-01 through 2020-12-21; source ID `msha-controller-operator-history`
- **Inspections:** 85 rows; 2000-05-11 through 2026-08-17; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 212 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 54 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:** 27 rows; 2007-04-19 through 2025-09-16; source ID `msha-personal-health-samples`
- **Violations:** 198 rows; 2000-07-25 through 2026-08-19; 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/arena-plant-4101495`
- JSON: `/api/v1/mines/arena-plant-4101495`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4101495/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4101495/relationships`
- MCP resource: `mine://4101495/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`