# Bluestone Quarry & Mill

- **MSHA mine ID:** 5100011
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Traprock
- **Location:** Kauai, HI
- **Operator:** Jas. W Glover Ltd.
- **Controller:** James W Glover Holding Company Ltd
- **Public source rows linked:** 672
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**James W Glover Holding Company Ltd (M34773) → Jas. W Glover Ltd. (L34773) → Bluestone Quarry & Mill (5100011)**

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

## Controller and operator valid-time history

- **David W  Pratt → Grove Farm Rock Company:** 1950-01-01 through 1998-07-19; derived from co-tenure at mine 5100011; source `msha-controller-operator-history`.
- **James W Glover Holding Company Ltd → Jas. W Glover Ltd.:** 1998-07-20 through current/open; derived from co-tenure at mine 5100011; source `msha-controller-operator-history`.

- History rows: 2
- Typed edges: 6
- 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 — 1 since 2021:** Accidents and injuries 25 historical accident/injury rows; 0 coded fatalities and 465 lost days across the published record.
2. **COMPLIANCE — 13 since 2021:** Violations and penalties 131 violation rows across the full record; 34 carry an S&S flag and $25,259 appears in current assessed amounts.
3. **HEALTH — 10 samples:** Occupational health samples 10 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 6K employee hours and 13 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 17 linked rows:** Contests, conferences and decisions 8 contested-violation rows, 8 civil-penalty docket/decision rows, and 1 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 — 17 since 2021:** Inspections 59 inspection events and 1K 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 56.14107 — 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
- **30 CFR 56.12004 — Electrical conductors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **30 CFR 56.14112 — Construction and maintenance of guards.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **30 CFR 56.4101 — Warning signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4101
- **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 56.20003 — Housekeeping.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **30 CFR 56.11001 — Safe access.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11001
- **30 CFR 47.41 — Requirement for container labels.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.41
- **30 CFR 56.12032 — Inspection and cover plates.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 25 rows; 2000-04-27 through 2025-03-27; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1978-02-03 through 1978-02-03; source ID `msha-addresses`
- **Assessed Violations:** 131 rows; 2000-01-10 through 2026-03-11; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 8 rows; 2012-06-06 through 2012-06-06; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 1 rows; 2011-06-02 through 2011-06-02; source ID `msha-conferences`
- **Contested Violations:** 8 rows; 2011-01-25 through 2011-01-31; source ID `msha-contested-violations`
- **Controller and Operator History:** 2 rows; 1950-01-01 through 1998-07-20; source ID `msha-controller-operator-history`
- **Inspections:** 59 rows; 2000-01-10 through 2026-07-07; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 240 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 55 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:** 10 rows; 2004-04-20 through 2024-01-03; source ID `msha-personal-health-samples`
- **Violations:** 131 rows; 2000-01-10 through 2026-03-11; 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/bluestone-quarry-mill-5100011`
- JSON: `/api/v1/mines/bluestone-quarry-mill-5100011`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/5100011/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/5100011/relationships`
- MCP resource: `mine://5100011/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`