# Portable Crusher #1

- **MSHA mine ID:** 0504202
- **Status:** Abandoned
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Jefferson, CO
- **Operator:** Asphalt Paving Company
- **Controller:** Jeffrey W  Keller; John M  Keller
- **Public source rows linked:** 154
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Jeffrey W  Keller; John M  Keller (M01715) → Asphalt Paving Company (L01904) → Portable Crusher #1 (0504202)**

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

## Controller and operator valid-time history

- **John M  Keller  et al → Asphalt Paving Company:** 1987-01-01 through current/open; derived from co-tenure at mine 0504202; source `msha-controller-operator-history`.
- **Jeffrey W  Keller  et al → Asphalt Paving Company:** 1987-01-01 through current/open; derived from co-tenure at mine 0504202; source `msha-controller-operator-history`.

- History rows: 2
- Typed edges: 4
- 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: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 0 since 2021:** Accidents and injuries 1 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 47 violation rows across the full record; 18 carry an S&S flag and $5,829 appears in current assessed amounts.
3. **HEALTH — 2 samples:** Occupational health samples 2 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 1K employee hours and 3 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 12 linked rows:** Contests, conferences and decisions 5 contested-violation rows, 5 civil-penalty docket/decision rows, and 2 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 12 inspection events and 138 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 56.12030 — Correction of dangerous conditions.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12030
- **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 56.4601 — Oxygen cylinder storage.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4601
- **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 56.12008 — Insulation and fittings for power wires and cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12008
- **30 CFR 56.12004 — Electrical conductors.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **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 56.14112 — 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 56.14107 — 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

## Source coverage

- **Accident, Injuries, and Illnesses:** 1 rows; 2001-05-15 through 2001-05-15; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2009-01-15 through 2009-01-15; source ID `msha-addresses`
- **Assessed Violations:** 47 rows; 2000-05-04 through 2008-07-01; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 5 rows; 2006-06-27 through 2007-02-15; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 2 rows; 2000-06-13 through 2000-06-13; source ID `msha-conferences`
- **Contested Violations:** 5 rows; 2005-06-07 through 2006-08-09; source ID `msha-contested-violations`
- **Controller and Operator History:** 2 rows; 1987-01-01 through 1987-01-01; source ID `msha-controller-operator-history`
- **Inspections:** 12 rows; 2000-05-04 through 2008-07-14; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 14 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 15 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:** 2 rows; 2005-06-08 through 2005-06-08; source ID `msha-personal-health-samples`
- **Violations:** 47 rows; 2000-05-04 through 2008-07-01; 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/portable-crusher-1-0504202`
- JSON: `/api/v1/mines/portable-crusher-1-0504202`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0504202/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0504202/relationships`
- MCP resource: `mine://0504202/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`