# I-12

- **MSHA mine ID:** 4202096
- **Status:** Abandoned
- **Type / commodity:** Underground / Gilsonite
- **Location:** Uintah, UT
- **Operator:** Ziegler Chemical & Mineral Corp
- **Controller:** Gordon S  Ziegler Jr
- **Public source rows linked:** 23
- **Source coverage:** 7 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Gordon S  Ziegler Jr (M01010) → Ziegler Chemical & Mineral Corp (L01159) → I-12 (4202096)**

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

## Controller and operator valid-time history

- **Gordon S  Ziegler Jr → Ziegler Chemical & Mineral Corp:** 1994-03-01 through 1994-06-13; derived from co-tenure at mine 4202096; source `msha-controller-operator-history`.
- **Slaugh Clayton → C L D Inc:** 1994-06-14 through 2000-11-30; derived from co-tenure at mine 4202096; source `msha-controller-operator-history`.
- **Dall  Cook  et al → C & S Mining Inc:** 2000-12-01 through 2001-05-02; derived from co-tenure at mine 4202096; source `msha-controller-operator-history`.
- **Gordon S  Ziegler Jr → Ziegler Chemical & Mineral Corp:** 2001-05-03 through current/open; derived from co-tenure at mine 4202096; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 11
- 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 5 violation rows across the full record; 0 carry an S&S flag and $275 appears in current assessed amounts.
3. **HEALTH — 5 samples:** Occupational health samples 5 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 — No published quarter:** Quarterly production and employment The source remains registered, but no mine-keyed quarterly production row was published.
5. **LEGAL — 0 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 civil-penalty docket/decision rows, and 0 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 2 inspection events and 47 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 57.4402 — Safety can use.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-C/section-57.4402
- **30 CFR 62.120 — Action level.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-M/part-62/section-62.120
- **30 CFR 57.19007 — Overtravel and overspeed devices.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-R/section-57.19007
- **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 48.3 — Training plans; time of submission; where filed; information required; time for approval; method for disapproval; commencement of training; approval of instructors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-48/subpart-A/section-48.3

## Source coverage

- **Addresses of Record:** 1 rows; 2001-02-28 through 2001-02-28; source ID `msha-addresses`
- **Assessed Violations:** 5 rows; 2000-12-20 through 2001-01-03; source ID `msha-assessed-violations`
- **Controller and Operator History:** 4 rows; 1994-03-01 through 2001-05-03; source ID `msha-controller-operator-history`
- **Inspections:** 2 rows; 2000-12-20 through 2001-02-14; source ID `msha-inspections`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Metal and Nonmetal Personal Health Samples:** 5 rows; 2001-01-03 through 2001-01-03; source ID `msha-personal-health-samples`
- **Violations:** 5 rows; 2000-12-20 through 2001-01-03; 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/i-12-4202096`
- JSON: `/api/v1/mines/i-12-4202096`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4202096/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4202096/relationships`
- MCP resource: `mine://4202096/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`