# 43526 - **MSHA mine ID:** 2103110 - **Status:** Abandoned - **Type / commodity:** Surface / Construction Sand and Gravel - **Location:** Beltrami, MN - **Operator:** Northstar Materials Inc. - **Controller:** Knife River Corporation - **Public source rows linked:** 109 - **Source coverage:** 10 / 20 - **Generated:** 2026-10-13T11:26:59.401Z ## Current entity hierarchy **Knife River Corporation (0176802) → Northstar Materials Inc. (0051129) → 43526 (2103110)** 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:** 1995-10-01 through 2003-08-20; derived from co-tenure at mine 2103110; source `msha-controller-operator-history`. - **MDU Resources Group Inc → Northstar Materials Inc:** 2003-08-21 through 2023-05-31; derived from co-tenure at mine 2103110; source `msha-controller-operator-history`. - **Knife River Corporation → Northstar Materials Inc:** 2023-06-01 through current/open; derived from co-tenure at mine 2103110; 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 — 0 since 2021:** Accidents and injuries 0 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record. 2. **COMPLIANCE — 0 since 2021:** Violations and penalties 25 violation rows across the full record; 6 carry an S&S flag and $1,231 appears in current assessed amounts. 3. **HEALTH — 2 samples:** Occupational health samples 2 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 0 employee hours and 0 summed average employees across reported subunits in the latest published quarter. 5. **LEGAL — 24 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 24 civil-penalty docket/decision rows, and 0 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 — 0 since 2021:** Inspections 6 inspection events and 62 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 56.18002 — Examination of working places.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18002 - **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 56.11012 — Protection for openings around travelways.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11012 - **30 CFR 56.14100 — Safety defects; examination, correction and records.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100 - **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 56.14107 — Moving machine parts.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107 - **30 CFR 62.120 — Action level.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-M/part-62/section-62.120 - **30 CFR 56.15001 — First-aid materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15001 ## Source coverage - **Addresses of Record:** 1 rows; 2004-07-06 through 2004-07-06; source ID `msha-addresses` - **Assessed Violations:** 25 rows; 2002-05-06 through 2002-10-02; source ID `msha-assessed-violations` - **Civil Penalty Dockets and Decisions:** 24 rows; 2003-02-28 through 2003-04-21; source ID `msha-civil-penalty-dockets-decisions` - **Controller and Operator History:** 3 rows; 1995-10-01 through 2003-08-21; source ID `msha-controller-operator-history` - **Inspections:** 6 rows; 2002-05-06 through 2003-12-18; source ID `msha-inspections` - **Mine Employment and Production — Quarterly:** 19 rows; unknown through unknown; source ID `msha-mine-production-quarterly` - **Mine Employment and Production — Yearly:** 3 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:** 2 rows; 2002-05-07 through 2002-05-07; source ID `msha-personal-health-samples` - **Violations:** 25 rows; 2002-05-06 through 2002-10-02; 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/43526-2103110` - JSON: `/api/v1/mines/43526-2103110` - Silica records, units, sample status and quarterly means: `/api/v1/mines/2103110/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows) - Relationship JSON: `/api/v1/mines/2103110/relationships` - MCP resource: `mine://2103110/assessment` - Complete Title 30 corpus: `/data/title30-sections.json`