# PWP #6

- **MSHA mine ID:** 1300919
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Polk, IA
- **Operator:** Hallett Materials
- **Controller:** CRH PLC
- **Public source rows linked:** 560
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**CRH PLC (M06183) → Hallett Materials (0085824) → PWP #6 (1300919)**

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

## Controller and operator valid-time history

- **Farge Construction Company Inc → Estherville Sand & Gravel Inc:** 1950-01-01 through 2000-04-02; derived from co-tenure at mine 1300919; source `msha-controller-operator-history`.
- **Matt D  Petersen et al → Estherville Rock & Gravel:** 2000-04-03 through 2002-04-10; derived from co-tenure at mine 1300919; source `msha-controller-operator-history`.
- **Darrin L  Kruse et al → Estherville Rock & Gravel:** 2000-04-03 through 2002-04-10; derived from co-tenure at mine 1300919; source `msha-controller-operator-history`.
- **Matt D  Petersen et al → K P Materials, Inc.:** 2002-04-11 through 2005-09-15; derived from co-tenure at mine 1300919; source `msha-controller-operator-history`.
- **Darrin L  Kruse et al → K P Materials, Inc.:** 2002-04-11 through 2005-09-15; derived from co-tenure at mine 1300919; source `msha-controller-operator-history`.
- **CRH PLC → Hallett Materials Inc:** 2005-09-16 through 2008-01-02; derived from co-tenure at mine 1300919; source `msha-controller-operator-history`.
- **Rasmussen Group Inc → Hallett Materials Inc:** 2005-09-16 through 2001-08-10; derived from co-tenure at mine 1300919; source `msha-controller-operator-history`.
- **CRH PLC → Hallett Materials:** 2008-01-03 through current/open; derived from co-tenure at mine 1300919; source `msha-controller-operator-history`.

- History rows: 8
- Typed edges: 19
- 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 — 2 since 2021:** Accidents and injuries 3 historical accident/injury rows; 0 coded fatalities and 151 lost days across the published record.
2. **COMPLIANCE — 4 since 2021:** Violations and penalties 78 violation rows across the full record; 19 carry an S&S flag and $8,096 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 1K employee hours and 4 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 13 linked rows:** Contests, conferences and decisions 4 contested-violation rows, 7 civil-penalty docket/decision rows, and 2 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 — 8 since 2021:** Inspections 45 inspection events and 520 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 46.9 — Records of training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.9
- **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 56.4601 — Oxygen cylinder storage.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4601
- **30 CFR 50.30 — Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-D/section-50.30
- **30 CFR 56.14205 — Machinery, equipment, and tools.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14205
- **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 56.14107 — Moving machine parts.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **30 CFR 46.5 — New miner training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.5
- **30 CFR 56.12004 — Electrical conductors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **30 CFR 56.4101 — Warning signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4101
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 3 rows; 2001-08-14 through 2024-04-22; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2025-06-17 through 2025-06-17; source ID `msha-addresses`
- **Assessed Violations:** 74 rows; 2000-09-13 through 2026-02-18; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 7 rows; 2001-12-27 through 2014-08-20; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 2 rows; 2004-06-15 through 2004-06-15; source ID `msha-conferences`
- **Contested Violations:** 4 rows; 2008-04-16 through 2014-04-01; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 39 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 11 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 8 rows; 1950-01-01 through 2008-01-03; source ID `msha-controller-operator-history`
- **Inspections:** 45 rows; 2000-09-13 through 2026-09-14; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 209 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 50 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; 2002-07-31 through 2026-09-15; source ID `msha-personal-health-samples`
- **Violations:** 78 rows; 2000-09-13 through 2026-09-15; 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/pwp-6-1300919`
- JSON: `/api/v1/mines/pwp-6-1300919`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1300919/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1300919/relationships`
- MCP resource: `mine://1300919/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`