# Colorado Quartz

- **MSHA mine ID:** 0403828
- **Status:** Abandoned
- **Type / commodity:** Underground / Gold Ore
- **Location:** Mariposa, CA
- **Operator:** Colorado Quartz Gold Corp
- **Controller:** Dave C  Varabioff
- **Public source rows linked:** 177
- **Source coverage:** 10 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Dave C  Varabioff (0148883) → Colorado Quartz Gold Corp (L10885) → Colorado Quartz (0403828)**

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

## Controller and operator valid-time history

- **Colorado Minerals Unlimited → Colorado Minerals Unlimited:** 1950-01-01 through 1982-04-27; derived from co-tenure at mine 0403828; source `msha-controller-operator-history`.
- **John E  Newman et al → Western States Mining Company Inc:** 1982-04-28 through 1988-12-12; derived from co-tenure at mine 0403828; source `msha-controller-operator-history`.
- **Larry E  Lehto → Colorado Quartz Gold Corp:** 1988-12-13 through 2009-03-03; derived from co-tenure at mine 0403828; source `msha-controller-operator-history`.
- **Lance W  Barker → Colorado Quartz Gold Corp:** 2009-03-04 through 2017-09-09; derived from co-tenure at mine 0403828; source `msha-controller-operator-history`.
- **Dave C  Varabioff → Colorado Quartz Gold Corp:** 2017-09-10 through current/open; derived from co-tenure at mine 0403828; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 13
- 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 0 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 10 since 2021:** Violations and penalties 43 violation rows across the full record; 11 carry an S&S flag and $5,027 appears in current assessed amounts.
3. **HEALTH — 1 samples:** Occupational health samples 1 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 4 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 4 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 civil-penalty docket/decision rows, and 4 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 — 3 since 2021:** Inspections 16 inspection events and 297 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 57.4201 — Inspection.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-C/section-57.4201
- **30 CFR 57.11001 — Safe access.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-J/section-57.11001
- **30 CFR 57.8520 — Ventilation plan.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-G/section-57.8520
- **30 CFR 49.3 — Alternative mine rescue capability for small and remote mines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-49/subpart-A/section-49.3
- **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 57.8527 — Oxygen-deficiency testing.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-G/section-57.8527
- **30 CFR 57.12028 — Testing grounding systems.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-K/section-57.12028
- **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 48.8 — Annual refresher training of miners; minimum courses of instruction; hours of instruction.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-48/subpart-A/section-48.8
- **30 CFR 57.1000 — Notification of commencement of operations and closing of mines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-A/section-57.1000
- **30 CFR 48.11 — Hazard training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-48/subpart-A/section-48.11
- **30 CFR 48.5 — Training of new miners; minimum courses of instruction; hours of instruction.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-48/subpart-A/section-48.5

## Source coverage

- **Addresses of Record:** 1 rows; 2023-03-20 through 2023-03-20; source ID `msha-addresses`
- **Assessed Violations:** 43 rows; 2000-01-12 through 2023-03-16; source ID `msha-assessed-violations`
- **Conferences:** 4 rows; 2013-03-20 through 2013-03-20; source ID `msha-conferences`
- **Controller and Operator History:** 5 rows; 1950-01-01 through 1988-12-13; source ID `msha-controller-operator-history`
- **Inspections:** 16 rows; 2000-01-11 through 2023-03-06; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 49 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 14 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:** 1 rows; 2012-03-13 through 2012-03-13; source ID `msha-personal-health-samples`
- **Violations:** 43 rows; 2000-01-12 through 2023-03-16; 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/colorado-quartz-0403828`
- JSON: `/api/v1/mines/colorado-quartz-0403828`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0403828/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0403828/relationships`
- MCP resource: `mine://0403828/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`