# Spec Agg Quarry

- **MSHA mine ID:** 0500860
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Sandstone
- **Location:** Jefferson, CO
- **Operator:** Martin Marietta Materials
- **Controller:** Martin Marietta Materials Inc
- **Public source rows linked:** 2,101
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Martin Marietta Materials Inc (M00174) → Martin Marietta Materials (L16197) → Spec Agg Quarry (0500860)**

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

## Controller and operator valid-time history

- **Daniel W  Holloway → Holloway Sand & Gravel Company Inc:** 1950-01-01 through 1979-02-14; derived from co-tenure at mine 0500860; source `msha-controller-operator-history`.
- **M P M Inc → Mobile Premix Concrete Inc:** 1979-02-15 through 1987-04-30; derived from co-tenure at mine 0500860; source `msha-controller-operator-history`.
- **Koppers Co Inc & Redland Plc → Mobile Premix Sand & Gravel:** 1987-05-01 through 1988-06-13; derived from co-tenure at mine 0500860; source `msha-controller-operator-history`.
- **Redland Plc → Western Mobile Denver Aggregate:** 1988-06-14 through 1998-02-10; derived from co-tenure at mine 0500860; source `msha-controller-operator-history`.
- **Lafarge S A → Western Mobile Inc:** 1998-02-11 through 2002-01-30; derived from co-tenure at mine 0500860; source `msha-controller-operator-history`.
- **Lafarge S A → Lafarge West Incorporated:** 2002-01-31 through 2011-12-20; derived from co-tenure at mine 0500860; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Materials:** 2011-12-21 through current/open; derived from co-tenure at mine 0500860; source `msha-controller-operator-history`.
- **Holcim Ltd → Lafarge West Incorporated:** 2015-07-10 through 2011-12-20; derived from co-tenure at mine 0500860; source `msha-controller-operator-history`.

- History rows: 8
- Typed edges: 23
- Interval anomalies: 1
- 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 — 7 since 2021:** Accidents and injuries 46 historical accident/injury rows; 0 coded fatalities and 32 lost days across the published record.
2. **COMPLIANCE — 28 since 2021:** Violations and penalties 116 violation rows across the full record; 18 carry an S&S flag and $20,470 appears in current assessed amounts.
3. **HEALTH — 28 samples:** Occupational health samples 28 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 30K employee hours and 45 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 28 linked rows:** Contests, conferences and decisions 12 contested-violation rows, 12 civil-penalty docket/decision rows, and 4 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 — 34 since 2021:** Inspections 80 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 46.11 — Site-specific hazard awareness training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.11
- **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 56.14100 — Safety defects; examination, correction and records.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **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 56.12004 — 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 56.14101 — Brakes.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14101
- **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 56.12025 — Grounding circuit enclosures.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12025
- **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 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 56.12028 — 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:** 46 rows; 2000-02-15 through 2025-04-08; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2011-10-05 through 2011-10-05; source ID `msha-addresses`
- **Assessed Violations:** 114 rows; 2000-09-21 through 2026-04-29; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 12 rows; 2006-05-23 through 2022-02-19; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 4 rows; 2000-10-16 through 2007-11-20; source ID `msha-conferences`
- **Contested Violations:** 12 rows; 2004-09-28 through 2021-08-04; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,145 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 268 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 8 rows; 1950-01-01 through 2011-12-21; source ID `msha-controller-operator-history`
- **Inspections:** 80 rows; 2000-09-21 through 2026-08-17; 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:** 28 rows; 2002-03-20 through 2025-10-08; source ID `msha-personal-health-samples`
- **Violations:** 116 rows; 2000-09-21 through 2026-08-17; 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/spec-agg-quarry-0500860`
- JSON: `/api/v1/mines/spec-agg-quarry-0500860`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0500860/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0500860/relationships`
- MCP resource: `mine://0500860/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`