# Crusher #43519

- **MSHA mine ID:** 2102718
- **Status:** Intermittent
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Beltrami, MN
- **Operator:** Northstar Materials Inc dba Knife River Materials
- **Controller:** Knife River Corporation
- **Public source rows linked:** 381
- **Source coverage:** 12 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Knife River Corporation (0176802) → Northstar Materials Inc dba Knife River Materials (0051129) → Crusher #43519 (2102718)**

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

## Controller and operator valid-time history

- **W T  Thorson → Thorson Inc:** 1979-01-01 through 2003-04-13; derived from co-tenure at mine 2102718; source `msha-controller-operator-history`.
- **MDU Resources Group Inc → Northstar Materials Inc dba Knife River Materials:** 2003-04-14 through 2023-05-31; derived from co-tenure at mine 2102718; source `msha-controller-operator-history`.
- **Knife River Corporation → Northstar Materials Inc dba Knife River Materials:** 2023-06-01 through current/open; derived from co-tenure at mine 2102718; 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 3 historical accident/injury rows; 0 coded fatalities and 311 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 52 violation rows across the full record; 14 carry an S&S flag and $5,928 appears in current assessed amounts.
3. **HEALTH — 11 samples:** Occupational health samples 11 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 2K employee hours and 8 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 18 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 14 civil-penalty docket/decision rows, and 4 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 — 6 since 2021:** Inspections 33 inspection events and 309 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 56.14112 — Construction and maintenance of guards.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **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 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 56.4201 — 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 56.12004 — Electrical conductors.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **30 CFR 56.1000 — Notification of commencement of operations and closing of mines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-A/section-56.1000
- **30 CFR 56.15005 — Safety belts and lines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15005
- **30 CFR 56.14110 — Flying or falling materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14110

## Source coverage

- **Accident, Injuries, and Illnesses:** 3 rows; 2002-07-16 through 2023-06-14; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2003-05-07 through 2003-05-07; source ID `msha-addresses`
- **Assessed Violations:** 51 rows; 2000-06-01 through 2019-10-08; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 14 rows; 2001-04-04 through 2001-04-04; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 4 rows; 2019-01-03 through 2019-01-03; source ID `msha-conferences`
- **Controller and Operator History:** 3 rows; 1979-01-01 through 2003-04-14; source ID `msha-controller-operator-history`
- **Inspections:** 33 rows; 2000-05-31 through 2026-08-25; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 165 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 43 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:** 11 rows; 2003-10-08 through 2024-05-29; source ID `msha-personal-health-samples`
- **Violations:** 52 rows; 2000-06-01 through 2019-10-08; 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/crusher-43519-2102718`
- JSON: `/api/v1/mines/crusher-43519-2102718`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/2102718/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/2102718/relationships`
- MCP resource: `mine://2102718/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`