# Portable Plant #4

- **MSHA mine ID:** 1400156
- **Status:** Abandoned
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** Barry, MO
- **Operator:** Cornejo & Sons LLC
- **Controller:** Summit Materials LLC
- **Public source rows linked:** 760
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Summit Materials LLC (M02046) → Cornejo & Sons LLC (0117666) → Portable Plant #4 (1400156)**

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

## Controller and operator valid-time history

- **George E  Nettels → Midwest Minerals LLC:** 2000-08-01 through 2018-04-26; derived from co-tenure at mine 1400156; source `msha-controller-operator-history`.
- **Summit Materials LLC → Midwest Minerals LLC:** 2018-04-27 through 2018-08-23; derived from co-tenure at mine 1400156; source `msha-controller-operator-history`.
- **Summit Materials LLC → Cornejo & Sons LLC:** 2018-08-24 through current/open; derived from co-tenure at mine 1400156; source `msha-controller-operator-history`.

- History rows: 3
- Typed edges: 8
- 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 — 1 since 2021:** Accidents and injuries 6 historical accident/injury rows; 0 coded fatalities and 4 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 110 violation rows across the full record; 29 carry an S&S flag and $19,776 appears in current assessed amounts.
3. **HEALTH — 18 samples:** Occupational health samples 18 personal. 1 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 10 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 15 linked rows:** Contests, conferences and decisions 6 contested-violation rows, 6 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 — 1 since 2021:** Inspections 40 inspection events and 597 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 56.9300 — Berms or guardrails.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9300
- **30 CFR 46.5 — New miner training.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.5
- **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 56.14130 — Roll-over protective structures (ROPS) and seat belts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14130
- **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 56.4101 — 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 56.12013 — Splices and repairs of power cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12013
- **30 CFR 56.14112 — Construction and maintenance of guards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **30 CFR 56.3200 — Correction of hazardous conditions.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-B/section-56.3200
- **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:** 6 rows; 2010-02-01 through 2021-06-09; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2024-10-08 through 2024-10-08; source ID `msha-addresses`
- **Assessed Violations:** 107 rows; 2003-09-03 through 2020-11-03; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 6 rows; 2007-06-12 through 2009-10-14; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 3 rows; 2007-12-19 through 2007-12-19; source ID `msha-conferences`
- **Contested Violations:** 6 rows; 2006-06-13 through 2007-12-04; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 228 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 61 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 2000-08-01 through 2018-08-24; source ID `msha-controller-operator-history`
- **Inspections:** 40 rows; 2001-02-15 through 2022-06-22; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 139 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 31 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:** 18 rows; 2006-06-13 through 2018-09-05; source ID `msha-personal-health-samples`
- **Violations:** 110 rows; 2003-09-03 through 2020-11-03; 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/portable-plant-4-1400156`
- JSON: `/api/v1/mines/portable-plant-4-1400156`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1400156/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1400156/relationships`
- MCP resource: `mine://1400156/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`