# HILLTOP MINE

- **MSHA mine ID:** 3401903
- **Status:** Active
- **Type / commodity:** Surface / Dimension Limestone
- **Location:** Le Flore, OK
- **Operator:** TerraCore Materials, LLC
- **Controller:** Michael Chad  Robinson; Mason  Warren
- **Public source rows linked:** 469
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Michael Chad  Robinson; Mason  Warren (0199484) → TerraCore Materials, LLC (0208454) → HILLTOP MINE (3401903)**

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

## Controller and operator valid-time history

- **Tommy  Caldwell  et al → Bluebird Stone:** 2002-10-28 through 2008-01-01; derived from co-tenure at mine 3401903; source `msha-controller-operator-history`.
- **Danny  Caldwell  et al → Bluebird Stone:** 2002-10-28 through 2008-01-01; derived from co-tenure at mine 3401903; source `msha-controller-operator-history`.
- **Danny  Caldwell  et al → Bluebird Stone:** 2008-01-02 through 2016-01-31; derived from co-tenure at mine 3401903; source `msha-controller-operator-history`.
- **Tommy  Caldwell  et al → Bluebird Stone:** 2008-01-02 through 2016-01-31; derived from co-tenure at mine 3401903; source `msha-controller-operator-history`.
- **Tommy  Caldwell → Bluebird Stone:** 2016-02-01 through 2026-04-12; derived from co-tenure at mine 3401903; source `msha-controller-operator-history`.
- **Michael Chad  Robinson et al → TerraCore Materials, LLC:** 2026-04-13 through current/open; derived from co-tenure at mine 3401903; source `msha-controller-operator-history`.
- **Mason  Warren et al → TerraCore Materials, LLC:** 2026-04-13 through current/open; derived from co-tenure at mine 3401903; source `msha-controller-operator-history`.

- History rows: 7
- Typed edges: 14
- 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 — 22 since 2021:** Violations and penalties 59 violation rows across the full record; 21 carry an S&S flag and $8,133 appears in current assessed amounts.
3. **HEALTH — 16 samples:** Occupational health samples 16 personal. 3 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 679 employee hours and 3 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 8 linked rows:** Contests, conferences and decisions 4 contested-violation rows, 4 civil-penalty docket/decision rows, and 0 conference records linked by issuance number.
6. **CONTRACTORS — 2 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 — 12 since 2021:** Inspections 42 inspection events and 523 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 56.12018 — Identification of power switches.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12018
- **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 56.11003 — Construction and maintenance of ladders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11003
- **30 CFR 56.4201 — Inspection.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4201
- **30 CFR 56.14132 — Horns and backup alarms.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132
- **30 CFR 56.12028 — Testing grounding systems.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12028
- **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 56.23002 — Written safety program.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-T/section-56.23002
- **30 CFR 56.4101 — Warning signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4101
- **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

## Source coverage

- **Addresses of Record:** 1 rows; 2019-02-08 through 2019-02-08; source ID `msha-addresses`
- **Assessed Violations:** 56 rows; 2005-03-10 through 2026-07-23; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2010-05-12 through 2018-07-11; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 4 rows; 2009-04-23 through 2017-10-18; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 36 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 13 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 7 rows; 2002-10-28 through 2026-04-13; source ID `msha-controller-operator-history`
- **Inspections:** 42 rows; 2005-03-10 through 2026-07-21; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 184 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 46 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:** 16 rows; 2010-02-18 through 2025-09-25; source ID `msha-personal-health-samples`
- **Violations:** 59 rows; 2005-03-10 through 2026-07-23; 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/hilltop-mine-3401903`
- JSON: `/api/v1/mines/hilltop-mine-3401903`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/3401903/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/3401903/relationships`
- MCP resource: `mine://3401903/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`