# Snyder Quarry

- **MSHA mine ID:** 0500444
- **Status:** Abandoned
- **Type / commodity:** Surface / Crushed, Broken Stone NEC
- **Location:** El Paso, CO
- **Operator:** Castle Concrete Aggregates
- **Controller:** Continental Materials Corp
- **Public source rows linked:** 154
- **Source coverage:** 12 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Continental Materials Corp (M00196) → Castle Concrete Aggregates (L00235) → Snyder Quarry (0500444)**

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

## Controller and operator valid-time history

- **Continental Materials Corp → Castle Concrete Aggregates:** 1950-01-01 through current/open; derived from co-tenure at mine 0500444; source `msha-controller-operator-history`.

- History rows: 1
- Typed edges: 3
- 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 5 historical accident/injury rows; 0 coded fatalities and 117 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 26 violation rows across the full record; 7 carry an S&S flag and $8,624 appears in current assessed amounts.
3. **HEALTH — 15 samples:** Occupational health samples 15 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 3K employee hours and 7 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 2 linked rows:** Contests, conferences and decisions 1 contested-violation rows, 1 civil-penalty docket/decision rows, and 0 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 — 0 since 2021:** Inspections 17 inspection events and 336 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 56.14207 — Parking procedures for unattended equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14207
- **30 CFR 56.12002 — Controls and switches.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12002
- **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 56.5002 — Exposure monitoring.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-D/section-56.5002
- **30 CFR 56.5001 — Exposure limits for airborne contaminants.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-D/section-56.5001
- **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 56.14132 — 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 56.14101 — Brakes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14101
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 5 rows; 2009-05-09 through 2013-04-30; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2014-08-19 through 2014-08-19; source ID `msha-addresses`
- **Assessed Violations:** 25 rows; 2000-05-09 through 2013-01-24; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 1 rows; 2010-09-23 through 2010-09-23; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 1 rows; 2009-05-11 through 2009-05-11; source ID `msha-contested-violations`
- **Controller and Operator History:** 1 rows; 1950-01-01 through 1950-01-01; source ID `msha-controller-operator-history`
- **Inspections:** 17 rows; 2000-01-19 through 2013-04-30; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 48 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 13 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:** 15 rows; 2010-03-09 through 2013-04-04; source ID `msha-personal-health-samples`
- **Violations:** 26 rows; 2000-05-09 through 2013-04-30; 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/snyder-quarry-0500444`
- JSON: `/api/v1/mines/snyder-quarry-0500444`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0500444/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0500444/relationships`
- MCP resource: `mine://0500444/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`