# Twinsburg Development Corp.

- **MSHA mine ID:** 3304204
- **Status:** Abandoned
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Portage, OH
- **Operator:** Twinsburg Development Corp
- **Controller:** Jerome  Osborne
- **Public source rows linked:** 333
- **Source coverage:** 14 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Jerome  Osborne (M08176) → Twinsburg Development Corp (L15314) → Twinsburg Development Corp. (3304204)**

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

## Controller and operator valid-time history

- **Gary  Helf → Aurora Sand & Gravel Company:** 1990-06-01 through 1997-04-13; derived from co-tenure at mine 3304204; source `msha-controller-operator-history`.
- **Jerome  Osborne et al → Twinsburg Development Corp:** 1997-04-14 through current/open; derived from co-tenure at mine 3304204; 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: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 0 since 2021:** Accidents and injuries 4 historical accident/injury rows; 0 coded fatalities and 5 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 92 violation rows across the full record; 32 carry an S&S flag and $37,236 appears in current assessed amounts.
3. **HEALTH — 2 samples:** Occupational health samples 2 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 4K employee hours and 10 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 60 linked rows:** Contests, conferences and decisions 30 contested-violation rows, 30 civil-penalty docket/decision rows, and 0 conference records linked by issuance number.
6. **CONTRACTORS — 1 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 20 inspection events and 372 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 46.11 — Site-specific hazard awareness training.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.11
- **30 CFR 56.3130 — Wall, bank, and slope stability.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-B/section-56.3130
- **30 CFR 56.3200 — Correction of hazardous conditions.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-B/section-56.3200
- **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 56.9300 — Berms or guardrails.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9300
- **30 CFR 56.4203 — Extinguisher recharging or replacement.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4203
- **30 CFR 56.14107 — Moving machine parts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **30 CFR 56.14201 — Conveyor start-up warnings.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14201
- **30 CFR 56.14112 — Construction and maintenance of guards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **30 CFR 56.14109 — Unguarded conveyors with adjacent travelways.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14109

## Source coverage

- **Accident, Injuries, and Illnesses:** 4 rows; 2000-11-21 through 2006-08-21; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2011-12-28 through 2011-12-28; source ID `msha-addresses`
- **Assessed Violations:** 91 rows; 2000-04-11 through 2011-10-18; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 30 rows; 2011-11-21 through 2012-07-24; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 30 rows; 2011-02-15 through 2011-10-18; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 21 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 5 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 2 rows; 1990-06-01 through 1997-04-14; source ID `msha-controller-operator-history`
- **Inspections:** 20 rows; 2000-04-11 through 2011-12-28; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 13 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 21 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:** 2 rows; 2011-02-15 through 2011-02-15; source ID `msha-personal-health-samples`
- **Violations:** 92 rows; 2000-04-11 through 2011-10-18; 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/twinsburg-development-corp-3304204`
- JSON: `/api/v1/mines/twinsburg-development-corp-3304204`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/3304204/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/3304204/relationships`
- MCP resource: `mine://3304204/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`