# Copperstone Mine

- **MSHA mine ID:** 0203000
- **Status:** NonProducing
- **Type / commodity:** Underground / Gold Ore
- **Location:** La Paz, AZ
- **Operator:** Bonanza Explorations, Inc.
- **Controller:** Mining Americas Inc
- **Public source rows linked:** 3,279
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Mining Americas Inc (0192041) → Bonanza Explorations, Inc. (0063543) → Copperstone Mine (0203000)**

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

## Controller and operator valid-time history

- **Richard (Dick)  Merritt → Dick Merritt Construction:** 2002-09-30 through 2005-06-07; derived from co-tenure at mine 0203000; source `msha-controller-operator-history`.
- **American Bonanza Gold Corporation → Bonanza Explorations, Inc.:** 2005-06-08 through 2014-06-26; derived from co-tenure at mine 0203000; source `msha-controller-operator-history`.
- **Sabre Gold Mines Corp → Bonanza Explorations, Inc.:** 2014-06-27 through 2025-02-05; derived from co-tenure at mine 0203000; source `msha-controller-operator-history`.
- **Mining Americas Inc → Bonanza Explorations, Inc.:** 2025-02-06 through current/open; derived from co-tenure at mine 0203000; source `msha-controller-operator-history`.

- History rows: 4
- 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 — 0 since 2021:** Accidents and injuries 25 historical accident/injury rows; 0 coded fatalities and 270 lost days across the published record.
2. **COMPLIANCE — 28 since 2021:** Violations and penalties 171 violation rows across the full record; 48 carry an S&S flag and $38,896 appears in current assessed amounts.
3. **HEALTH — 57 samples:** Occupational health samples 57 personal. 10 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 4K employee hours and 7 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 12 linked rows:** Contests, conferences and decisions 4 contested-violation rows, 4 civil-penalty docket/decision rows, and 4 conference records linked by issuance number.
6. **CONTRACTORS — 10 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 — 30 since 2021:** Inspections 102 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 57.15001 — First aid materials.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-N/section-57.15001
- **30 CFR 50.10 — Immediate notification.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-B/section-50.10
- **30 CFR 57.3200 — Correction of hazardous conditions.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-B/section-57.3200
- **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 57.12018 — Identification of power switches.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12018
- **30 CFR 57.14115 — Stationary grinding machines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14115
- **30 CFR 57.12040 — Installation of operating controls.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12040
- **30 CFR 57.12004 — Electrical conductors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12004
- **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 57.4361 — Underground evacuation drills.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-C/section-57.4361
- **30 CFR 57.3203 — Rock fixtures.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-B/section-57.3203

## Source coverage

- **Accident, Injuries, and Illnesses:** 25 rows; 2006-10-04 through 2019-03-19; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2016-12-21 through 2016-12-21; source ID `msha-addresses`
- **Assessed Violations:** 167 rows; 2003-05-06 through 2025-12-03; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2012-08-14 through 2014-05-09; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 4 rows; 2012-06-25 through 2018-01-04; source ID `msha-conferences`
- **Contested Violations:** 4 rows; 2011-07-26 through 2013-07-30; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 2,006 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 385 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 2002-09-30 through 2005-06-08; source ID `msha-controller-operator-history`
- **Inspections:** 102 rows; 2003-01-07 through 2026-07-13; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 279 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 69 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:** 57 rows; 2003-01-29 through 2026-03-10; source ID `msha-personal-health-samples`
- **Violations:** 171 rows; 2003-05-06 through 2025-12-03; 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/copperstone-mine-0203000`
- JSON: `/api/v1/mines/copperstone-mine-0203000`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0203000/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0203000/relationships`
- MCP resource: `mine://0203000/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`