# Firestone Gravel Mine

- **MSHA mine ID:** 0504838
- **Status:** Abandoned
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Weld, CO
- **Operator:** BURNCO Colorado LLC
- **Controller:** Burnco Rock Products Ltd
- **Public source rows linked:** 272
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Burnco Rock Products Ltd (0117981) → BURNCO Colorado LLC (0097925) → Firestone Gravel Mine (0504838)**

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

## Controller and operator valid-time history

- **George W  Hall et al → Hall Irwin Corporation:** 2006-01-24 through 2010-07-13; derived from co-tenure at mine 0504838; source `msha-controller-operator-history`.
- **George W  Hall et al → Hall-Irwin Aggregates LLC:** 2010-07-14 through 2011-07-11; derived from co-tenure at mine 0504838; source `msha-controller-operator-history`.
- **Bret  Hall et al → Hall-Irwin Aggregates LLC:** 2011-07-12 through 2012-06-20; derived from co-tenure at mine 0504838; source `msha-controller-operator-history`.
- **Scott  Masi et al → Hall-Irwin Aggregates LLC:** 2011-07-12 through 2012-06-20; derived from co-tenure at mine 0504838; source `msha-controller-operator-history`.
- **Bret  Hall et al → BURNCO Colorado LLC:** 2012-06-21 through 2017-02-26; derived from co-tenure at mine 0504838; source `msha-controller-operator-history`.
- **Scott  Masi et al → BURNCO Colorado LLC:** 2012-06-21 through 2017-02-26; derived from co-tenure at mine 0504838; source `msha-controller-operator-history`.
- **Burnco Rock Products Ltd → BURNCO Colorado LLC:** 2017-02-27 through current/open; derived from co-tenure at mine 0504838; source `msha-controller-operator-history`.

- History rows: 7
- 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: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 0 since 2021:** Accidents and injuries 5 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 48 violation rows across the full record; 8 carry an S&S flag and $6,577 appears in current assessed amounts.
3. **HEALTH — 17 samples:** Occupational health samples 17 personal. 1 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 — No published quarter:** Quarterly production and employment The source remains registered, but no mine-keyed quarterly production row was published.
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 — 0 since 2021:** Inspections 32 inspection events and 413 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 56.1000 — Notification of commencement of operations and closing of mines.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-A/section-56.1000
- **30 CFR 56.12021 — Danger signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12021
- **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 56.4102 — 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 56.12004 — 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 56.12028 — 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 56.5001 — 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 56.14132 — 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 56.4201 — 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 56.11003 — Construction and maintenance of ladders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11003

## Source coverage

- **Accident, Injuries, and Illnesses:** 5 rows; 2011-05-11 through 2016-06-21; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2019-12-31 through 2019-12-31; source ID `msha-addresses`
- **Assessed Violations:** 48 rows; 2006-07-25 through 2020-05-04; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2014-04-14 through 2018-03-08; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 4 rows; 2013-05-20 through 2017-04-26; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 61 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 16 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 7 rows; 2006-01-24 through 2012-06-21; source ID `msha-controller-operator-history`
- **Inspections:** 32 rows; 2006-06-20 through 2020-04-28; source ID `msha-inspections`
- **Mine Employment and Production — Yearly:** 28 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:** 17 rows; 2010-03-17 through 2017-08-31; source ID `msha-personal-health-samples`
- **Violations:** 48 rows; 2006-07-25 through 2020-05-04; 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/firestone-gravel-mine-0504838`
- JSON: `/api/v1/mines/firestone-gravel-mine-0504838`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0504838/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0504838/relationships`
- MCP resource: `mine://0504838/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`