# Lane Mtn Silica Quarry & Mill

- **MSHA mine ID:** 4500983
- **Status:** Active
- **Type / commodity:** Surface / Ground Silica
- **Location:** Stevens, WA
- **Operator:** Lane Mt. Silica Co.
- **Controller:** Hemphill Brothers Inc
- **Public source rows linked:** 1,728
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Hemphill Brothers Inc (M00808) → Lane Mt. Silica Co. (L07954) → Lane Mtn Silica Quarry & Mill (4500983)**

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

## Controller and operator valid-time history

- **Martin Marietta Corp et al → Lane Mountain Silica Company:** 1950-01-01 through 1985-07-08; derived from co-tenure at mine 4500983; source `msha-controller-operator-history`.
- **Hemphill Brothers Inc → Hemphill Brothers Inc:** 1985-07-09 through 2013-01-08; derived from co-tenure at mine 4500983; source `msha-controller-operator-history`.
- **Hemphill Brothers Inc → Lane Mountain Silica Company:** 2013-01-09 through 1985-07-08; derived from co-tenure at mine 4500983; source `msha-controller-operator-history`.
- **Hemphill Brothers Inc → Lane Mt. Silica Co.:** 2013-01-09 through current/open; derived from co-tenure at mine 4500983; source `msha-controller-operator-history`.
- **Martin Marietta Corp et al → Lane Mt. Silica Co.:** 2013-01-09 through 1985-07-08; derived from co-tenure at mine 4500983; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 11
- Interval anomalies: 2
- 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: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 8 since 2021:** Accidents and injuries 40 historical accident/injury rows; 0 coded fatalities and 114 lost days across the published record.
2. **COMPLIANCE — 96 since 2021:** Violations and penalties 361 violation rows across the full record; 77 carry an S&S flag and $92,477 appears in current assessed amounts.
3. **HEALTH — 94 samples:** Occupational health samples 87 personal; 7 area. 19 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 10K employee hours and 21 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 192 linked rows:** Contests, conferences and decisions 96 contested-violation rows, 96 civil-penalty docket/decision rows, and 0 conference records linked by issuance number.
6. **CONTRACTORS — 2 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 — 26 since 2021:** Inspections 92 inspection events and 3K 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 56.9300 — 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
- **30 CFR 56.4201 — Inspection.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4201
- **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 56.17001 — Illumination of surface working areas.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-P/section-56.17001
- **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 56.4501 — Fuel lines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4501
- **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.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107

## Source coverage

- **Accident, Injuries, and Illnesses:** 40 rows; 2003-10-29 through 2026-07-15; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1985-07-11 through 1985-07-11; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 7 rows; 2002-04-30 through 2002-11-20; source ID `msha-area-samples`
- **Assessed Violations:** 361 rows; 2000-01-19 through 2026-06-22; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 96 rows; 2010-06-21 through 2026-06-11; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 96 rows; 2005-06-30 through 2026-06-22; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 389 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 75 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 1950-01-01 through 2013-01-09; source ID `msha-controller-operator-history`
- **Inspections:** 92 rows; 2000-01-19 through 2026-09-08; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 36 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 81 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:** 87 rows; 2001-08-29 through 2024-12-03; source ID `msha-personal-health-samples`
- **Violations:** 361 rows; 2000-01-19 through 2026-06-22; 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/lane-mtn-silica-quarry-mill-4500983`
- JSON: `/api/v1/mines/lane-mtn-silica-quarry-mill-4500983`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4500983/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4500983/relationships`
- MCP resource: `mine://4500983/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`