# Bear Butte Quarry

- **MSHA mine ID:** 0405687
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Stone NEC
- **Location:** Humboldt, CA
- **Operator:** Kernen Construction
- **Controller:** Scott  Farley; Kurt  Kernen
- **Public source rows linked:** 382
- **Source coverage:** 10 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Scott  Farley; Kurt  Kernen (M11952) → Kernen Construction (L15674) → Bear Butte Quarry (0405687)**

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

## Controller and operator valid-time history

- **Kurt  Kernen et al → Kernen Construction:** 2006-05-26 through 2016-04-09; derived from co-tenure at mine 0405687; source `msha-controller-operator-history`.
- **Scott  Farley et al → Kernen Construction:** 2006-05-26 through 2016-04-09; derived from co-tenure at mine 0405687; source `msha-controller-operator-history`.
- **Shawn T  Studebaker → Laytonville Rock:** 2016-04-10 through 2021-04-06; derived from co-tenure at mine 0405687; source `msha-controller-operator-history`.
- **Kurt  Kernen et al → Kernen Construction:** 2021-04-07 through current/open; derived from co-tenure at mine 0405687; source `msha-controller-operator-history`.
- **Scott  Farley et al → Kernen Construction:** 2021-04-07 through current/open; derived from co-tenure at mine 0405687; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 10
- 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 — 17 since 2021:** Violations and penalties 64 violation rows across the full record; 12 carry an S&S flag and $8,870 appears in current assessed amounts.
3. **HEALTH — 7 samples:** Occupational health samples 7 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 4 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 5 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 civil-penalty docket/decision rows, and 5 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 — 14 since 2021:** Inspections 43 inspection events and 541 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 56.15001 — 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
- **30 CFR 56.18002 — Examination of working places.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18002
- **30 CFR 56.4130 — Electric substations and liquid storage facilities.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4130
- **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
- **30 CFR 46.7 — New task training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.7
- **30 CFR 56.14207 — Parking procedures for unattended equipment.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14207
- **30 CFR 56.14206 — Securing movable parts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14206
- **30 CFR 56.9301 — Dump site restraints.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9301
- **30 CFR 56.14132 — Horns and backup alarms.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132
- **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 56.9300 — Berms or guardrails.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9300

## Source coverage

- **Addresses of Record:** 1 rows; 2017-07-09 through 2017-07-09; source ID `msha-addresses`
- **Assessed Violations:** 62 rows; 2006-07-11 through 2025-12-02; source ID `msha-assessed-violations`
- **Conferences:** 5 rows; 2015-07-10 through 2015-07-10; source ID `msha-conferences`
- **Controller and Operator History:** 5 rows; 2006-05-26 through 2021-04-07; source ID `msha-controller-operator-history`
- **Inspections:** 43 rows; 2006-07-11 through 2026-06-22; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 156 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 38 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:** 7 rows; 2011-04-19 through 2026-06-24; source ID `msha-personal-health-samples`
- **Violations:** 64 rows; 2006-07-11 through 2025-12-02; 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/bear-butte-quarry-0405687`
- JSON: `/api/v1/mines/bear-butte-quarry-0405687`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0405687/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0405687/relationships`
- MCP resource: `mine://0405687/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`