# SILVER BELL MINING LLC

- **MSHA mine ID:** 0200134
- **Status:** Active
- **Type / commodity:** Surface / Copper Ore NEC
- **Location:** Pima, AZ
- **Operator:** ASARCO LLC, a Delaware Limited Liability Company
- **Controller:** Grupo Mexico S A B de C V
- **Public source rows linked:** 6,722
- **Source coverage:** 16 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Grupo Mexico S A B de C V (M13109) → ASARCO LLC, a Delaware Limited Liability Company (L17191) → SILVER BELL MINING LLC (0200134)**

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

## Controller and operator valid-time history

- **Asarco Inc → Silver Bell Mining Llc:** 1950-01-01 through 2000-02-29; derived from co-tenure at mine 0200134; source `msha-controller-operator-history`.
- **Grupo Mexico S A B de C V → ASARCO LLC, a Delaware Limited Liability Company:** 2000-03-01 through current/open; derived from co-tenure at mine 0200134; source `msha-controller-operator-history`.

- History rows: 2
- Typed edges: 6
- 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 — 24 since 2021:** Accidents and injuries 185 historical accident/injury rows; 0 coded fatalities and 3,310 lost days across the published record.
2. **COMPLIANCE — 44 since 2021:** Violations and penalties 447 violation rows across the full record; 77 carry an S&S flag and $181,056 appears in current assessed amounts.
3. **HEALTH — 97 samples:** Occupational health samples 91 personal; 6 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 109K employee hours and 208 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 111 linked rows:** Contests, conferences and decisions 44 contested-violation rows, 46 civil-penalty docket/decision rows, and 21 conference records linked by issuance number.
6. **CONTRACTORS — 21 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 — 28 since 2021:** Inspections 116 inspection events and 4K 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 56.14101 — 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 56.12004 — 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 56.23002 — Written safety program.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-T/section-56.23002
- **30 CFR 56.23003 — Requirements for written safety program.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-T/section-56.23003
- **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 50.30 — Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-D/section-50.30
- **30 CFR 56.12018 — Identification of power switches.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12018
- **30 CFR 48.27 — Training of miners assigned to a task in which they have had no previous experience; minimum courses of instruction.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-48/subpart-B/section-48.27
- **30 CFR 56.15001 — First-aid materials.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15001

## Source coverage

- **Accident, Injuries, and Illnesses:** 185 rows; 2000-03-31 through 2026-07-28; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2026-02-24 through 2026-02-24; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 6 rows; 2004-03-11 through 2010-12-22; source ID `msha-area-samples`
- **Assessed Violations:** 444 rows; 2000-03-30 through 2026-08-23; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 46 rows; 2002-02-27 through 2024-11-25; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 21 rows; 2000-11-02 through 2021-10-12; source ID `msha-conferences`
- **Contested Violations:** 44 rows; 2007-03-01 through 2026-02-18; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 4,094 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 825 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 2 rows; 1950-01-01 through 2000-03-01; source ID `msha-controller-operator-history`
- **Inspections:** 116 rows; 2000-03-27 through 2026-10-06; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 318 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 81 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:** 91 rows; 2004-03-11 through 2025-04-02; source ID `msha-personal-health-samples`
- **Violations:** 447 rows; 2000-03-30 through 2026-08-23; 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/silver-bell-mining-llc-0200134`
- JSON: `/api/v1/mines/silver-bell-mining-llc-0200134`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0200134/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0200134/relationships`
- MCP resource: `mine://0200134/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`