# US Aggregates-Monon Quarry

- **MSHA mine ID:** 1200194
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** White, IN
- **Operator:** US Aggregates LLC
- **Controller:** The Heritage Group
- **Public source rows linked:** 918
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**The Heritage Group (M01806) → US Aggregates LLC (L11249) → US Aggregates-Monon Quarry (1200194)**

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

## Controller and operator valid-time history

- **Medusa Corp → Medusa Aggregates Company:** 1950-01-01 through 1978-12-31; derived from co-tenure at mine 1200194; source `msha-controller-operator-history`.
- **Crane Company → Medusa Aggregates Company:** 1979-01-01 through 1982-12-19; derived from co-tenure at mine 1200194; source `msha-controller-operator-history`.
- **Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, L.P.:** 1982-12-20 through 2007-11-15; derived from co-tenure at mine 1200194; source `msha-controller-operator-history`.
- **Vulcan Materials Company → Vulcan Construction Materials, L.P.:** 2007-11-16 through 2011-09-30; derived from co-tenure at mine 1200194; source `msha-controller-operator-history`.
- **The Heritage Group → Heritage Aggregates, LLC:** 2011-10-01 through 2020-04-20; derived from co-tenure at mine 1200194; source `msha-controller-operator-history`.
- **The Heritage Group → US Aggregates Inc:** 2020-04-21 through 2026-06-17; derived from co-tenure at mine 1200194; source `msha-controller-operator-history`.
- **The Heritage Group → US Aggregates LLC:** 2026-06-18 through current/open; derived from co-tenure at mine 1200194; source `msha-controller-operator-history`.

- History rows: 7
- Typed edges: 19
- 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 — 0 since 2021:** Accidents and injuries 5 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 28 since 2021:** Violations and penalties 79 violation rows across the full record; 29 carry an S&S flag and $20,331 appears in current assessed amounts.
3. **HEALTH — 28 samples:** Occupational health samples 28 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 5K employee hours and 8 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 3 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 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 69 inspection events and 996 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 56.12018 — 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 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 56.12006 — Distribution boxes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12006
- **30 CFR 56.14100 — Safety defects; examination, correction and records.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **30 CFR 56.4402 — Safety can use.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4402
- **30 CFR 56.18002 — Examination of working places.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18002
- **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 56.20003 — 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 56.14207 — 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:** 5 rows; 2000-07-13 through 2010-09-08; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2023-04-27 through 2023-04-27; source ID `msha-addresses`
- **Assessed Violations:** 79 rows; 2000-05-09 through 2026-04-29; source ID `msha-assessed-violations`
- **Conferences:** 3 rows; 2006-09-22 through 2022-05-18; source ID `msha-conferences`
- **Contractor Employment and Production — Quarterly:** 204 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 44 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 7 rows; 1950-01-01 through 2026-06-18; source ID `msha-controller-operator-history`
- **Inspections:** 69 rows; 2000-05-09 through 2026-09-02; 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:** 80 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:** 28 rows; 2001-05-15 through 2026-09-02; source ID `msha-personal-health-samples`
- **Violations:** 79 rows; 2000-05-09 through 2026-04-29; 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/us-aggregates-monon-quarry-1200194`
- JSON: `/api/v1/mines/us-aggregates-monon-quarry-1200194`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1200194/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1200194/relationships`
- MCP resource: `mine://1200194/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`