# Subtropolis

- **MSHA mine ID:** 3304547
- **Status:** Active
- **Type / commodity:** Underground / Crushed, Broken Limestone NEC
- **Location:** Mahoning, OH
- **Operator:** Subtropolis Mining Co.
- **Controller:** W Thomas  Mackall
- **Public source rows linked:** 3,228
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**W Thomas  Mackall (C00082) → Subtropolis Mining Co. (0062063) → Subtropolis (3304547)**

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

## Controller and operator valid-time history

- **W Thomas  Mackall et al → Subtropolis Mining Co.:** 2005-07-18 through current/open; derived from co-tenure at mine 3304547; source `msha-controller-operator-history`.

- History rows: 1
- Typed edges: 3
- 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 — 2 since 2021:** Accidents and injuries 29 historical accident/injury rows; 1 coded fatalities and 871 lost days across the published record.
2. **COMPLIANCE — 103 since 2021:** Violations and penalties 540 violation rows across the full record; 115 carry an S&S flag and $169,092 appears in current assessed amounts.
3. **HEALTH — 451 samples:** Occupational health samples 424 personal; 27 area. 38 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 — 97 linked rows:** Contests, conferences and decisions 42 contested-violation rows, 38 civil-penalty docket/decision rows, and 17 conference records linked by issuance number.
6. **CONTRACTORS — 9 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 — 36 since 2021:** Inspections 138 inspection events and 5K 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 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 57.4533 — Mine opening vicinity.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-C/section-57.4533
- **30 CFR 57.4462 — Storage of combustible liquids underground.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-C/section-57.4462
- **30 CFR 57.4460 — Storage of flammable liquids underground.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-C/section-57.4460
- **30 CFR 57.3200 — Correction of hazardous conditions.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-B/section-57.3200
- **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 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 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

## Source coverage

- **Accident, Injuries, and Illnesses:** 29 rows; 2005-08-15 through 2025-03-03; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2005-07-26 through 2005-07-26; source ID `msha-addresses`
- **Metal and Nonmetal Area Samples:** 27 rows; 2009-02-24 through 2025-10-07; source ID `msha-area-samples`
- **Assessed Violations:** 535 rows; 2005-09-08 through 2026-07-17; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 38 rows; 2013-01-03 through 2019-07-18; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 17 rows; 2011-05-06 through 2019-05-03; source ID `msha-conferences`
- **Contested Violations:** 42 rows; 2011-04-25 through 2019-01-23; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,071 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 280 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 1 rows; 2005-07-18 through 2005-07-18; source ID `msha-controller-operator-history`
- **Inspections:** 138 rows; 2005-09-08 through 2026-07-24; source ID `msha-inspections`
- **Mine Employment and Production — Yearly:** 84 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:** 424 rows; 2007-01-23 through 2026-04-15; source ID `msha-personal-health-samples`
- **Violations:** 540 rows; 2005-09-08 through 2026-07-17; 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/subtropolis-3304547`
- JSON: `/api/v1/mines/subtropolis-3304547`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/3304547/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/3304547/relationships`
- MCP resource: `mine://3304547/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`