# Menzer Quarry

- **MSHA mine ID:** 0500138
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Stone NEC
- **Location:** El Paso, CO
- **Operator:** Schmidt Aggregates
- **Controller:** Edward C  Levy Jr
- **Public source rows linked:** 3,023
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Edward C  Levy Jr (M05102) → Schmidt Aggregates (L15857) → Menzer Quarry (0500138)**

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

## Controller and operator valid-time history

- **Walter R  Schmidt → Schmidt-Tiago Construction Company:** 1950-01-01 through 1980-07-18; derived from co-tenure at mine 0500138; source `msha-controller-operator-history`.
- **Rogers Construction Inc → Schmidt-Tiago Construction Company:** 1980-07-19 through 1985-03-31; derived from co-tenure at mine 0500138; source `msha-controller-operator-history`.
- **J L Shiely  Company → Cooley Gravel Company Of Colorado Springs Inc:** 1985-04-01 through 1988-07-18; derived from co-tenure at mine 0500138; source `msha-controller-operator-history`.
- **English China Clays PLC → Cooley Gravel Company Of Colorado Springs Inc:** 1988-07-19 through 1990-07-18; derived from co-tenure at mine 0500138; source `msha-controller-operator-history`.
- **Edward C  Levy Jr et al → Schmidt Aggregates:** 1990-07-19 through current/open; derived from co-tenure at mine 0500138; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 15
- 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 — 4 since 2021:** Accidents and injuries 24 historical accident/injury rows; 0 coded fatalities and 771 lost days across the published record.
2. **COMPLIANCE — 74 since 2021:** Violations and penalties 402 violation rows across the full record; 94 carry an S&S flag and $147,648 appears in current assessed amounts.
3. **HEALTH — 63 samples:** Occupational health samples 63 personal. 7 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 11K employee hours and 14 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 98 linked rows:** Contests, conferences and decisions 45 contested-violation rows, 45 civil-penalty docket/decision rows, and 8 conference records linked by issuance number.
6. **CONTRACTORS — 6 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 — 25 since 2021:** Inspections 85 inspection events and 2K 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.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **30 CFR 56.14205 — Machinery, equipment, and tools.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14205
- **30 CFR 56.4104 — Combustible waste.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4104
- **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 56.12032 — 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 56.18002 — 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 56.12004 — Electrical conductors.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **30 CFR 47.44 — Temporary, portable containers.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.44
- **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 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

## Source coverage

- **Accident, Injuries, and Illnesses:** 24 rows; 2000-02-07 through 2024-03-01; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2014-05-21 through 2014-05-21; source ID `msha-addresses`
- **Assessed Violations:** 398 rows; 2000-04-04 through 2026-06-22; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 45 rows; 2001-06-28 through 2012-01-26; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 8 rows; 2004-03-16 through 2007-05-31; source ID `msha-conferences`
- **Contested Violations:** 45 rows; 2005-08-23 through 2011-06-14; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,335 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 345 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 1950-01-01 through 1990-07-19; source ID `msha-controller-operator-history`
- **Inspections:** 85 rows; 2000-01-04 through 2026-10-07; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 212 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 54 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:** 63 rows; 2001-06-27 through 2026-06-23; source ID `msha-personal-health-samples`
- **Violations:** 402 rows; 2000-04-04 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/menzer-quarry-0500138`
- JSON: `/api/v1/mines/menzer-quarry-0500138`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0500138/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0500138/relationships`
- MCP resource: `mine://0500138/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`