# Mobile Crusher #1

- **MSHA mine ID:** 3502906
- **Status:** Intermittent
- **Type / commodity:** Surface / Crushed, Broken Stone NEC
- **Location:** Douglas, OR
- **Operator:** Knife River Materials
- **Controller:** Knife River Corporation
- **Public source rows linked:** 338
- **Source coverage:** 14 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Knife River Corporation (0176802) → Knife River Materials (0052886) → Mobile Crusher #1 (3502906)**

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

## Controller and operator valid-time history

- **Charles W  Royers → Charles Royers Company:** 1979-01-01 through 1990-08-26; derived from co-tenure at mine 3502906; source `msha-controller-operator-history`.
- **Leroy  Bracelin  et al → Bracelin-Yeager Div. of LTM Inc.:** 1990-08-27 through 2001-09-30; derived from co-tenure at mine 3502906; source `msha-controller-operator-history`.
- **Irv  Yeager  et al → Bracelin-Yeager Div. of LTM Inc.:** 1990-08-27 through 2001-09-30; derived from co-tenure at mine 3502906; source `msha-controller-operator-history`.
- **MDU Resources Group Inc → Bracelin-Yeager Umpqua River Navigation:** 2001-10-01 through 2007-07-02; derived from co-tenure at mine 3502906; source `msha-controller-operator-history`.
- **MDU Resources Group Inc → Knife River Materials:** 2007-07-03 through 2023-05-31; derived from co-tenure at mine 3502906; source `msha-controller-operator-history`.
- **Knife River Corporation → Knife River Materials:** 2023-06-01 through current/open; derived from co-tenure at mine 3502906; source `msha-controller-operator-history`.

- History rows: 6
- Typed edges: 15
- 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 1 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 4 since 2021:** Violations and penalties 43 violation rows across the full record; 9 carry an S&S flag and $4,573 appears in current assessed amounts.
3. **HEALTH — 15 samples:** Occupational health samples 14 personal; 1 area. 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 2K employee hours and 7 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 46 linked rows:** Contests, conferences and decisions 20 contested-violation rows, 20 civil-penalty docket/decision rows, and 6 conference records linked by issuance number.
6. **CONTRACTORS — 0 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 — 10 since 2021:** Inspections 49 inspection events and 759 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 56.12008 — Insulation and fittings for power wires and cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12008
- **30 CFR 56.12032 — Inspection and cover plates.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032
- **30 CFR 56.4101 — Warning signs.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4101
- **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 56.12002 — Controls and switches.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12002
- **30 CFR 56.12028 — Testing grounding systems.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12028
- **30 CFR 56.16005 — Securing gas cylinders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16005
- **30 CFR 56.11001 — Safe access.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11001
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 1 rows; 2001-09-10 through 2001-09-10; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2025-01-01 through 2025-01-01; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 1 rows; 2005-08-24 through 2005-08-24; source ID `msha-area-samples`
- **Assessed Violations:** 43 rows; 2001-05-30 through 2026-06-17; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 20 rows; 2011-04-06 through 2012-08-09; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 6 rows; 2006-05-30 through 2021-02-23; source ID `msha-conferences`
- **Contested Violations:** 20 rows; 2008-06-11 through 2010-06-16; source ID `msha-contested-violations`
- **Controller and Operator History:** 6 rows; 1979-01-01 through 2007-07-03; source ID `msha-controller-operator-history`
- **Inspections:** 49 rows; 2000-07-27 through 2026-06-16; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 106 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 27 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:** 14 rows; 2003-09-11 through 2026-06-17; source ID `msha-personal-health-samples`
- **Violations:** 43 rows; 2001-05-30 through 2026-06-17; 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/mobile-crusher-1-3502906`
- JSON: `/api/v1/mines/mobile-crusher-1-3502906`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/3502906/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/3502906/relationships`
- MCP resource: `mine://3502906/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`