# Silt Plant

- **MSHA mine ID:** 0504881
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Garfield, CO
- **Operator:** Western Slope Materials, LLC
- **Controller:** David  Stewart; Travis J Stewart
- **Public source rows linked:** 853
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**David  Stewart; Travis J Stewart (0131241) → Western Slope Materials, LLC (0110845) → Silt Plant (0504881)**

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

## Controller and operator valid-time history

- **Wiliam M  Roberts → Silt Sand and Gravel:** 2007-09-04 through 2010-06-16; derived from co-tenure at mine 0504881; source `msha-controller-operator-history`.
- **Travis J  Stewart et al → Western Slope Materials, LLC:** 2010-06-17 through 2016-10-04; derived from co-tenure at mine 0504881; source `msha-controller-operator-history`.
- **William M  Roberts et al → Western Slope Materials, LLC:** 2010-06-17 through 2016-10-04; derived from co-tenure at mine 0504881; source `msha-controller-operator-history`.
- **Travis J Stewart et al → Western Slope Materials, LLC:** 2016-10-05 through current/open; derived from co-tenure at mine 0504881; source `msha-controller-operator-history`.
- **David  Stewart et al → Western Slope Materials, LLC:** 2016-10-05 through current/open; derived from co-tenure at mine 0504881; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 10
- 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 — 3 since 2021:** Accidents and injuries 3 historical accident/injury rows; 0 coded fatalities and 589 lost days across the published record.
2. **COMPLIANCE — 8 since 2021:** Violations and penalties 52 violation rows across the full record; 12 carry an S&S flag and $11,860 appears in current assessed amounts.
3. **HEALTH — 29 samples:** Occupational health samples 28 personal; 1 area. 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 6K employee hours and 10 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 8 linked rows:** Contests, conferences and decisions 4 contested-violation rows, 4 civil-penalty docket/decision rows, and 0 conference records linked by issuance number.
6. **CONTRACTORS — 1 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 — 17 since 2021:** Inspections 50 inspection events and 690 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 56.14132 — 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 56.14100 — 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 56.16009 — Suspended loads.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16009
- **30 CFR 46.3 — Training plans.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.3
- **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 56.12032 — 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 56.4201 — Inspection.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4201
- **30 CFR 56.4203 — Extinguisher recharging or replacement.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4203
- **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 56.14103 — Operators stations.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14103
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 3 rows; 2024-01-26 through 2025-04-24; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2011-10-04 through 2011-10-04; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 1 rows; 2014-08-20 through 2014-08-20; source ID `msha-area-samples`
- **Assessed Violations:** 51 rows; 2008-10-29 through 2025-01-29; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2015-02-06 through 2016-06-24; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 4 rows; 2014-03-18 through 2015-10-20; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 430 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 30 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 2007-09-04 through 2010-06-17; source ID `msha-controller-operator-history`
- **Inspections:** 50 rows; 2008-03-13 through 2026-07-28; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 153 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 40 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; 2009-11-24 through 2025-12-17; source ID `msha-personal-health-samples`
- **Violations:** 52 rows; 2008-10-29 through 2025-01-29; 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/silt-plant-0504881`
- JSON: `/api/v1/mines/silt-plant-0504881`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0504881/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0504881/relationships`
- MCP resource: `mine://0504881/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`