# Jaw Plant and Cone Plant

- **MSHA mine ID:** 2103508
- **Status:** Abandoned
- **Type / commodity:** Surface / Crushed, Broken Stone NEC
- **Location:** Benton, MN
- **Operator:** Helmin Construction
- **Controller:** Katherine L  Novak; Luke E  Helmin
- **Public source rows linked:** 344
- **Source coverage:** 11 / 20
- **Generated:** 2026-10-18T09:31:49.615Z

## Current entity hierarchy

**Katherine L  Novak; Luke E  Helmin (0106781) → Helmin Construction (0084744) → Jaw Plant and Cone Plant (2103508)**

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

## Controller and operator valid-time history

- **William E  Helmin → Helmin Construction:** 2005-07-19 through 2007-07-15; derived from co-tenure at mine 2103508; source `msha-controller-operator-history`.
- **William E  Helmin → Helmin Construction:** 2007-07-16 through 2012-10-11; derived from co-tenure at mine 2103508; source `msha-controller-operator-history`.
- **Luke E  Helmin et al → Helmin Construction:** 2012-10-12 through current/open; derived from co-tenure at mine 2103508; source `msha-controller-operator-history`.
- **Katherine L  Novak et al → Helmin Construction:** 2012-10-12 through current/open; derived from co-tenure at mine 2103508; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 9
- 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: 2026-10-18T09:31:49.615908+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 — 14 since 2021:** Violations and penalties 46 violation rows across the full record; 9 carry an S&S flag and $5,947 appears in current assessed amounts.
3. **HEALTH — 5 samples:** Occupational health samples 5 personal. 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 3 employee hours and 1 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 2 linked rows:** Contests, conferences and decisions 1 contested-violation rows, 1 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 — 7 since 2021:** Inspections 32 inspection events and 256 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 56.1000 — 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 50.30 — Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.** (10 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-D/section-50.30
- **30 CFR 56.12005 — Protection of power conductors from mobile equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12005

## Source coverage

- **Addresses of Record:** 1 rows; 2026-02-05 through 2026-02-05; source ID `msha-addresses`
- **Assessed Violations:** 46 rows; 2006-05-31 through 2025-05-15; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 1 rows; 2010-05-21 through 2010-05-21; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 1 rows; 2009-05-26 through 2009-05-26; source ID `msha-contested-violations`
- **Controller and Operator History:** 4 rows; 2005-07-09 through 2007-07-16; source ID `msha-controller-operator-history`
- **Inspections:** 32 rows; 2006-05-31 through 2025-12-02; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 166 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 41 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:** 5 rows; 2011-07-12 through 2019-07-09; source ID `msha-personal-health-samples`
- **Violations:** 46 rows; 2006-05-31 through 2025-05-15; 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/jaw-plant-and-cone-plant-2103508`
- JSON: `/api/v1/mines/jaw-plant-and-cone-plant-2103508`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/2103508/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/2103508/relationships`
- MCP resource: `mine://2103508/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`