# PORTABLE # 2

- **MSHA mine ID:** 3503519
- **Status:** Intermittent
- **Type / commodity:** Surface / Crushed, Broken Stone NEC
- **Location:** Jefferson, OR
- **Operator:** 4 R Equipment LLC
- **Controller:** Ron  Robinson Jr; Ryan C  Clark
- **Public source rows linked:** 628
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Ron  Robinson Jr; Ryan C  Clark (0136901) → 4 R Equipment LLC (L15996) → PORTABLE # 2 (3503519)**

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

## Controller and operator valid-time history

- **Ron  Robinson Jr → 4 R Equipment LLC:** 2001-01-01 through 2016-04-12; derived from co-tenure at mine 3503519; source `msha-controller-operator-history`.
- **Ryan C  Clark et al → 4 R Equipment LLC:** 2016-04-13 through current/open; derived from co-tenure at mine 3503519; source `msha-controller-operator-history`.
- **Ron  Robinson Jr et al → 4 R Equipment LLC:** 2016-04-13 through current/open; derived from co-tenure at mine 3503519; source `msha-controller-operator-history`.

- History rows: 3
- 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 — 1 since 2021:** Accidents and injuries 3 historical accident/injury rows; 0 coded fatalities and 97 lost days across the published record.
2. **COMPLIANCE — 31 since 2021:** Violations and penalties 139 violation rows across the full record; 32 carry an S&S flag and $23,869 appears in current assessed amounts.
3. **HEALTH — 22 samples:** Occupational health samples 22 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 368 employee hours and 5 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 27 linked rows:** Contests, conferences and decisions 12 contested-violation rows, 12 civil-penalty docket/decision rows, and 3 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 — 14 since 2021:** Inspections 55 inspection events and 764 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 56.23002 — Written safety program.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-T/section-56.23002
- **30 CFR 56.11003 — Construction and maintenance of ladders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11003
- **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 56.14112 — 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 56.11002 — Handrails and toeboards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11002
- **30 CFR 56.12004 — Electrical conductors.** (4 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **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 56.11011 — Use of ladders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11011
- **30 CFR 56.14132 — Horns and backup alarms.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132

## Source coverage

- **Accident, Injuries, and Illnesses:** 3 rows; 2002-08-22 through 2025-03-10; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2026-02-26 through 2026-02-26; source ID `msha-addresses`
- **Assessed Violations:** 138 rows; 2001-04-04 through 2026-06-30; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 12 rows; 2010-05-20 through 2018-11-28; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 3 rows; 2005-02-07 through 2006-12-07; source ID `msha-conferences`
- **Contested Violations:** 12 rows; 2009-03-31 through 2018-03-08; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 2 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 1 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 2001-01-01 through 2001-01-01; source ID `msha-controller-operator-history`
- **Inspections:** 55 rows; 2001-04-04 through 2026-06-29; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 201 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 35 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:** 22 rows; 2003-03-05 through 2025-03-26; source ID `msha-personal-health-samples`
- **Violations:** 139 rows; 2001-04-04 through 2026-06-30; 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-2-3503519`
- JSON: `/api/v1/mines/portable-2-3503519`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/3503519/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/3503519/relationships`
- MCP resource: `mine://3503519/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`