# El Dorado Quarry

- **MSHA mine ID:** 2602278
- **Status:** Abandoned
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Clark, NV
- **Operator:** CEMEX Construction Materials Pacific LLC
- **Controller:** Cemex S A
- **Public source rows linked:** 751
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Cemex S A (M09149) → CEMEX Construction Materials Pacific LLC (0103149) → El Dorado Quarry (2602278)**

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

## Controller and operator valid-time history

- **Frank S  Lopke → Lopke Granite Products Inc:** 1995-05-01 through 1998-01-23; derived from co-tenure at mine 2602278; source `msha-controller-operator-history`.
- **Hanson PLC → Hanson Aggregates-Las Vegas Inc:** 1998-01-24 through 2001-09-16; derived from co-tenure at mine 2602278; source `msha-controller-operator-history`.
- **CSR Ltd → CEMEX:** 2001-09-17 through 2003-03-31; derived from co-tenure at mine 2602278; source `msha-controller-operator-history`.
- **Rinker Group Ltd → CEMEX:** 2003-04-01 through 2007-07-09; derived from co-tenure at mine 2602278; source `msha-controller-operator-history`.
- **Cemex S A → CEMEX:** 2007-07-10 through 2009-07-05; derived from co-tenure at mine 2602278; source `msha-controller-operator-history`.
- **Cemex S A → CEMEX Construction Materials Pacific LLC:** 2009-07-06 through current/open; derived from co-tenure at mine 2602278; source `msha-controller-operator-history`.

- History rows: 6
- Typed edges: 16
- 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 8 historical accident/injury rows; 0 coded fatalities and 33 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 129 violation rows across the full record; 14 carry an S&S flag and $23,960 appears in current assessed amounts.
3. **HEALTH — 24 samples:** Occupational health samples 24 personal. 2 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 0 employee hours and 0 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 25 linked rows:** Contests, conferences and decisions 6 contested-violation rows, 6 civil-penalty docket/decision rows, and 13 conference records linked by issuance number.
6. **CONTRACTORS — 3 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 — 0 since 2021:** Inspections 34 inspection events and 774 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 45.4 — Independent contractor register.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-G/part-45/section-45.4
- **30 CFR 56.18010 — First aid.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18010
- **30 CFR 56.4011 — Abandoned electric circuits.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4011
- **30 CFR 56.3200 — Correction of hazardous conditions.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-B/section-56.3200
- **30 CFR 41.12 — Changes; notification by operator.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-G/part-41/subpart-B/section-41.12
- **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
- **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 56.4102 — Spillage and leakage.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4102
- **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 56.14115 — Stationary grinding machines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14115
- **30 CFR 56.13021 — High-pressure hose connections.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-L/section-56.13021
- **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

- **Accident, Injuries, and Illnesses:** 8 rows; 2000-08-01 through 2007-02-14; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2009-10-05 through 2009-10-05; source ID `msha-addresses`
- **Assessed Violations:** 128 rows; 2000-08-08 through 2008-11-04; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 6 rows; 2008-04-10 through 2008-04-10; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 13 rows; 2000-10-24 through 2007-07-12; source ID `msha-conferences`
- **Contested Violations:** 6 rows; 2007-01-09 through 2007-01-10; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 252 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 61 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 6 rows; 1995-05-01 through 2009-07-06; source ID `msha-controller-operator-history`
- **Inspections:** 34 rows; 2000-08-07 through 2008-11-24; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 65 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 17 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:** 24 rows; 2000-08-08 through 2008-01-16; source ID `msha-personal-health-samples`
- **Violations:** 129 rows; 2000-08-08 through 2008-11-04; 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/el-dorado-quarry-2602278`
- JSON: `/api/v1/mines/el-dorado-quarry-2602278`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/2602278/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/2602278/relationships`
- MCP resource: `mine://2602278/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`