# UNION BRIDGE MD

- **MSHA mine ID:** 1800017
- **Status:** Active
- **Type / commodity:** Facility / Cement
- **Location:** Carroll, MD
- **Operator:** Heidelberg Materials US Cement LLC
- **Controller:** Heidelberg Materials AG
- **Public source rows linked:** 15,243
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Heidelberg Materials AG (M00004) → Heidelberg Materials US Cement LLC (L17551) → UNION BRIDGE MD (1800017)**

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

## Controller and operator valid-time history

- **Heidelberg Materials AG → Lehigh Portland Cement Company:** 1950-01-01 through 2002-01-31; derived from co-tenure at mine 1800017; source `msha-controller-operator-history`.
- **Heidelberg Materials AG → Heidelberg Materials US Cement LLC:** 2002-02-01 through current/open; derived from co-tenure at mine 1800017; 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: 2026-10-13T11:19:05.459773+00:00.

## Assessment signals

1. **SAFETY — 17 since 2021:** Accidents and injuries 419 historical accident/injury rows; 0 coded fatalities and 4,501 lost days across the published record.
2. **COMPLIANCE — 199 since 2021:** Violations and penalties 1,361 violation rows across the full record; 325 carry an S&S flag and $652,382 appears in current assessed amounts.
3. **HEALTH — 108 samples:** Occupational health samples 108 personal. 7 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 84K employee hours and 152 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 233 linked rows:** Contests, conferences and decisions 97 contested-violation rows, 108 civil-penalty docket/decision rows, and 28 conference records linked by issuance number.
6. **CONTRACTORS — 106 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 — 37 since 2021:** Inspections 161 inspection events and 9K 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 56.14105 — Procedures during repairs or maintenance.** (4 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14105
- **30 CFR 56.12032 — Inspection and cover plates.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032
- **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 56.16005 — Securing gas cylinders.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16005
- **30 CFR 56.20003 — Housekeeping.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 419 rows; 2000-01-18 through 2026-09-09; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1979-05-30 through 1979-05-30; source ID `msha-addresses`
- **Assessed Violations:** 1,339 rows; 2000-04-25 through 2026-07-21; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 108 rows; 2000-10-12 through 2026-04-20; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 28 rows; 2002-11-05 through 2025-09-30; source ID `msha-conferences`
- **Contested Violations:** 97 rows; 2002-10-22 through 2026-07-15; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 9,259 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 1,960 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 2 rows; 1950-01-01 through 2002-02-01; source ID `msha-controller-operator-history`
- **Inspections:** 161 rows; 2000-04-25 through 2026-09-28; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 318 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 81 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:** 108 rows; 2000-08-31 through 2025-05-20; source ID `msha-personal-health-samples`
- **Violations:** 1,361 rows; 2000-04-25 through 2026-09-29; 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/union-bridge-md-1800017`
- JSON: `/api/v1/mines/union-bridge-md-1800017`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1800017/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1800017/relationships`
- MCP resource: `mine://1800017/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`