# Knoxville Mine

- **MSHA mine ID:** 1302217
- **Status:** Abandoned
- **Type / commodity:** Underground / Crushed, Broken Limestone NEC
- **Location:** Marion, IA
- **Operator:** NR Hamm Quarry LLC
- **Controller:** Summit Materials LLC
- **Public source rows linked:** 4,907
- **Source coverage:** 16 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Summit Materials LLC (M02046) → NR Hamm Quarry LLC (L00313) → Knoxville Mine (1302217)**

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

## Controller and operator valid-time history

- **Greg  Bruening → Bruening Rock Products Inc:** 1998-03-01 through 2024-11-24; derived from co-tenure at mine 1302217; source `msha-controller-operator-history`.
- **N R  Hamm → NR Hamm Quarry LLC:** 2024-11-25 through 2012-02-08; derived from co-tenure at mine 1302217; source `msha-controller-operator-history`.
- **Summit Materials LLC → NR Hamm Quarry LLC:** 2024-11-25 through current/open; derived from co-tenure at mine 1302217; source `msha-controller-operator-history`.

- History rows: 3
- Typed edges: 8
- Interval anomalies: 1
- 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 — 3 since 2021:** Accidents and injuries 10 historical accident/injury rows; 0 coded fatalities and 619 lost days across the published record.
2. **COMPLIANCE — 95 since 2021:** Violations and penalties 798 violation rows across the full record; 213 carry an S&S flag and $454,442 appears in current assessed amounts.
3. **HEALTH — 324 samples:** Occupational health samples 289 personal; 35 area. 59 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 3K employee hours and 5 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 259 linked rows:** Contests, conferences and decisions 110 contested-violation rows, 134 civil-penalty docket/decision rows, and 15 conference records linked by issuance number.
6. **CONTRACTORS — 8 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 — 38 since 2021:** Inspections 214 inspection events and 5K 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 57.14101 — Brakes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14101
- **30 CFR 57.8520 — Ventilation plan.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-G/section-57.8520
- **30 CFR 57.4363 — Underground evacuation instruction.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-C/section-57.4363
- **30 CFR 57.4361 — Underground evacuation drills.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-C/section-57.4361
- **30 CFR 57.3200 — Correction of hazardous conditions.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-B/section-57.3200
- **30 CFR 57.6160 — Main facilities.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-E/section-57.6160
- **30 CFR 57.11053 — Escape and evacuation plans.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-J/section-57.11053
- **30 CFR 50.20-1 — General instructions for completing MSHA Form 7000-1.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-C/section-50.20-1
- **30 CFR 57.14207 — Parking procedures for unattended equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14207
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 10 rows; 2000-01-07 through 2025-06-25; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2026-05-28 through 2026-05-28; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 35 rows; 2009-08-13 through 2025-05-07; source ID `msha-area-samples`
- **Assessed Violations:** 780 rows; 2000-03-29 through 2025-12-16; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 134 rows; 2001-11-26 through 2022-02-28; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 15 rows; 2000-06-02 through 2019-09-25; source ID `msha-conferences`
- **Contested Violations:** 110 rows; 2005-06-13 through 2021-04-20; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,794 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 350 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 1998-03-01 through 2024-11-25; source ID `msha-controller-operator-history`
- **Inspections:** 214 rows; 2000-03-29 through 2026-02-23; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 303 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 70 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:** 289 rows; 2002-11-20 through 2025-12-17; source ID `msha-personal-health-samples`
- **Violations:** 798 rows; 2000-03-29 through 2025-12-16; 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/knoxville-mine-1302217`
- JSON: `/api/v1/mines/knoxville-mine-1302217`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1302217/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1302217/relationships`
- MCP resource: `mine://1302217/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`