# Rio Medina

- **MSHA mine ID:** 4103594
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** Medina, TX
- **Operator:** Martin Marietta Materials Southwest LLC
- **Controller:** Martin Marietta Materials Inc
- **Public source rows linked:** 2,265
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Martin Marietta Materials Inc (M00174) → Martin Marietta Materials Southwest LLC (0084984) → Rio Medina (4103594)**

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

## Controller and operator valid-time history

- **Alma  Tausch → Medina Crushed Stone Inc.:** 1990-02-01 through 2009-10-29; derived from co-tenure at mine 4103594; source `msha-controller-operator-history`.
- **Zachary  Tausch  et al → Medina Crushed Stone Inc.:** 2009-10-30 through 2011-06-17; derived from co-tenure at mine 4103594; source `msha-controller-operator-history`.
- **Vernon  Tausch  et al → Medina Crushed Stone Inc.:** 2009-10-30 through 2011-06-17; derived from co-tenure at mine 4103594; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Martin Marietta Materials Southwest LLC:** 2011-06-18 through current/open; derived from co-tenure at mine 4103594; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 9
- 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 — 4 since 2021:** Accidents and injuries 6 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 27 since 2021:** Violations and penalties 159 violation rows across the full record; 38 carry an S&S flag and $50,501 appears in current assessed amounts.
3. **HEALTH — 17 samples:** Occupational health samples 17 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 9K employee hours and 14 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 36 linked rows:** Contests, conferences and decisions 15 contested-violation rows, 15 civil-penalty docket/decision rows, and 6 conference records linked by issuance number.
6. **CONTRACTORS — 7 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 — 13 since 2021:** Inspections 67 inspection events and 869 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 56.14132 — Horns and backup alarms.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132
- **30 CFR 56.18002 — Examination of working places.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18002
- **30 CFR 56.14207 — Parking procedures for unattended equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14207
- **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 56.12032 — Inspection and cover plates.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032
- **30 CFR 56.18010 — First aid.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18010
- **30 CFR 48.29 — Records of training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-48/subpart-B/section-48.29
- **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 56.12008 — Insulation and fittings for power wires and cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12008
- **30 CFR 56.12004 — Electrical conductors.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004

## Source coverage

- **Accident, Injuries, and Illnesses:** 6 rows; 2005-11-10 through 2024-04-12; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1990-02-15 through 1990-02-15; source ID `msha-addresses`
- **Assessed Violations:** 156 rows; 2000-06-22 through 2026-05-18; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 15 rows; 2012-11-09 through 2017-09-22; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 6 rows; 2007-05-11 through 2017-12-13; source ID `msha-conferences`
- **Contested Violations:** 15 rows; 2010-03-17 through 2017-05-25; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,409 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 335 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1990-02-01 through 2011-06-18; source ID `msha-controller-operator-history`
- **Inspections:** 67 rows; 2000-06-22 through 2026-05-18; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 20 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 54 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:** 17 rows; 2003-10-30 through 2023-07-10; source ID `msha-personal-health-samples`
- **Violations:** 159 rows; 2000-06-22 through 2026-05-18; 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/rio-medina-4103594`
- JSON: `/api/v1/mines/rio-medina-4103594`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4103594/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4103594/relationships`
- MCP resource: `mine://4103594/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`