# Black Rose - **MSHA mine ID:** 0503460 - **Status:** Abandoned - **Type / commodity:** Underground / Gold Ore - **Location:** Boulder, CO - **Operator:** Gold Hill Minerals Inc - **Controller:** George Christodoulou; David Badner er al - **Public source rows linked:** 50 - **Source coverage:** 9 / 20 - **Generated:** 2026-10-13T11:26:59.401Z ## Current entity hierarchy **George Christodoulou; David Badner er al (0105261) → Gold Hill Minerals Inc (0124030) → Black Rose (0503460)** Current identity source: `msha-mines`. This is a current snapshot, not a historical claim. ## Controller and operator valid-time history - **Mehl Robert L → Jamestown Mining Company:** 1980-06-01 through 1983-10-12; derived from co-tenure at mine 0503460; source `msha-controller-operator-history`. - **Williams Tom & Michael B Smith → Black Rose Mining Company:** 1983-10-13 through 2007-01-16; derived from co-tenure at mine 0503460; source `msha-controller-operator-history`. - **Merendon Mining (Nevada) Inc → Merendon Mining (Colorado) Inc:** 2007-01-17 through 2012-02-23; derived from co-tenure at mine 0503460; source `msha-controller-operator-history`. - **David Badner er al → Gold Hill Minerals Inc:** 2012-02-24 through current/open; derived from co-tenure at mine 0503460; source `msha-controller-operator-history`. - **George Christodoulou et al → Gold Hill Minerals Inc:** 2012-02-24 through current/open; derived from co-tenure at mine 0503460; 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 — 0 since 2021:** Violations and penalties 8 violation rows across the full record; 1 carry an S&S flag and $1,057 appears in current assessed amounts. 3. **HEALTH — 0 samples:** Occupational health samples No published samples. 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 480 employee hours and 5 summed average employees across reported subunits in the latest published quarter. 5. **LEGAL — 1 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 civil-penalty docket/decision rows, and 1 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 — 0 since 2021:** Inspections 8 inspection events and 84 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.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-A/section-56.1000 - **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 48.25 — 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-B/section-48.25 - **30 CFR 57.3200 — Correction of hazardous conditions.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-B/section-57.3200 - **30 CFR 57.14206 — Securing movable parts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14206 - **30 CFR 41.20 — Legal identity report.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-G/part-41/subpart-C/section-41.20 ## Source coverage - **Addresses of Record:** 1 rows; 2008-07-22 through 2008-07-22; source ID `msha-addresses` - **Assessed Violations:** 7 rows; 2007-01-17 through 2008-06-24; source ID `msha-assessed-violations` - **Conferences:** 1 rows; 2007-08-03 through 2007-08-03; source ID `msha-conferences` - **Controller and Operator History:** 5 rows; 1980-06-01 through 2012-02-24; source ID `msha-controller-operator-history` - **Inspections:** 8 rows; 2007-01-17 through 2008-07-22; source ID `msha-inspections` - **Mine Employment and Production — Quarterly:** 15 rows; unknown through unknown; source ID `msha-mine-production-quarterly` - **Mine Employment and Production — Yearly:** 4 rows; unknown through unknown; source ID `msha-mine-production-yearly` - **Mines:** 1 rows; unknown through unknown; source ID `msha-mines` - **Violations:** 8 rows; 2007-01-17 through 2008-06-24; 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/black-rose-0503460` - JSON: `/api/v1/mines/black-rose-0503460` - Silica records, units, sample status and quarterly means: `/api/v1/mines/0503460/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows) - Relationship JSON: `/api/v1/mines/0503460/relationships` - MCP resource: `mine://0503460/assessment` - Complete Title 30 corpus: `/data/title30-sections.json`