# Mercer

- **MSHA mine ID:** 3607431
- **Status:** Abandoned
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Mercer, PA
- **Operator:** Three Rivers Aggregates LLC
- **Controller:** Sweet Water Quarries LLC; Three River Agg Holding LLC
- **Public source rows linked:** 591
- **Source coverage:** 12 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Sweet Water Quarries LLC; Three River Agg Holding LLC (0174681) → Three Rivers Aggregates LLC (0109368) → Mercer (3607431)**

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

## Controller and operator valid-time history

- **Gabriel  Sacco → Atlantic Materials Inc:** 1983-02-01 through 1993-03-09; derived from co-tenure at mine 3607431; source `msha-controller-operator-history`.
- **Bruntcliffe Aggregates PLC → Atlantic States Materials Of Pa Inc:** 1993-03-10 through 1997-09-30; derived from co-tenure at mine 3607431; source `msha-controller-operator-history`.
- **Ennstone PLC → Atlantic States Materials of PA Inc:** 1997-10-01 through 2006-05-14; derived from co-tenure at mine 3607431; source `msha-controller-operator-history`.
- **Ennstone PLC → Three Rivers Aggregates:** 2006-05-15 through 2009-06-10; derived from co-tenure at mine 3607431; source `msha-controller-operator-history`.
- **Mark  Elliott → Three Rivers Aggregates:** 2009-06-11 through 2010-04-18; derived from co-tenure at mine 3607431; source `msha-controller-operator-history`.
- **Lindy Paving Incorporated et al → Three Rivers Aggregates LLC:** 2010-04-19 through 2021-12-31; derived from co-tenure at mine 3607431; source `msha-controller-operator-history`.
- **Sweet Water Quarries LLC et al → Three Rivers Aggregates LLC:** 2010-04-19 through 2021-12-31; derived from co-tenure at mine 3607431; source `msha-controller-operator-history`.
- **Sweet Water Quarries LLC et al → Three Rivers Aggregates LLC:** 2022-01-01 through current/open; derived from co-tenure at mine 3607431; source `msha-controller-operator-history`.
- **Three River Agg Holding LLC et al → Three Rivers Aggregates LLC:** 2022-01-01 through current/open; derived from co-tenure at mine 3607431; source `msha-controller-operator-history`.

- History rows: 9
- Typed edges: 21
- 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 15 historical accident/injury rows; 0 coded fatalities and 75 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 54 violation rows across the full record; 10 carry an S&S flag and $5,568 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 3K employee hours and 5 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 0 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 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 — 0 since 2021:** Inspections 41 inspection events and 511 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 56.14132 — Horns and backup alarms.** (5 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132
- **30 CFR 56.15020 — Life jackets and belts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15020
- **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 41.12 — Changes; notification by operator.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-G/part-41/subpart-B/section-41.12
- **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 56.4501 — Fuel lines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4501

## Source coverage

- **Accident, Injuries, and Illnesses:** 15 rows; 2000-05-16 through 2015-04-30; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2016-10-13 through 2016-10-13; source ID `msha-addresses`
- **Assessed Violations:** 54 rows; 2000-08-15 through 2015-12-16; source ID `msha-assessed-violations`
- **Contractor Employment and Production — Quarterly:** 175 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 49 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 9 rows; 1983-02-01 through 2010-04-19; source ID `msha-controller-operator-history`
- **Inspections:** 41 rows; 2000-08-14 through 2015-12-16; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 130 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 34 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; 2000-08-16 through 2013-03-20; source ID `msha-personal-health-samples`
- **Violations:** 54 rows; 2000-08-15 through 2015-12-16; 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/mercer-3607431`
- JSON: `/api/v1/mines/mercer-3607431`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/3607431/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/3607431/relationships`
- MCP resource: `mine://3607431/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`