# ALTO BONITO GRAVEL PIT

- **MSHA mine ID:** 4103140
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Starr, TX
- **Operator:** South Texas Sand & Gravel LLC
- **Controller:** EF Sand and Gravel LLC
- **Public source rows linked:** 871
- **Source coverage:** 14 / 20
- **Generated:** 2026-10-18T09:31:49.615Z

## Current entity hierarchy

**EF Sand and Gravel LLC (0170083) → South Texas Sand & Gravel LLC (0167514) → ALTO BONITO GRAVEL PIT (4103140)**

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

## Controller and operator valid-time history

- **Conrado  Guerra → Alto Bonito Gravel Plant:** 1982-10-01 through 1999-12-14; derived from co-tenure at mine 4103140; source `msha-controller-operator-history`.
- **Noe  Paredes-Salazar et al → Starr Aggregates Llc:** 1999-12-15 through 2019-11-30; derived from co-tenure at mine 4103140; source `msha-controller-operator-history`.
- **Melba  Reynolds et al → Starr Aggregates Llc:** 1999-12-15 through 2019-11-30; derived from co-tenure at mine 4103140; source `msha-controller-operator-history`.
- **Epigmenio  Falcon et al → South Texas Sand & Gravel LLC:** 2019-12-01 through 2022-05-11; derived from co-tenure at mine 4103140; source `msha-controller-operator-history`.
- **Melba  Reynolds et al → South Texas Sand & Gravel LLC:** 2019-12-01 through 2022-05-11; derived from co-tenure at mine 4103140; source `msha-controller-operator-history`.
- **EF Sand and Gravel LLC → South Texas Sand & Gravel LLC:** 2022-05-12 through current/open; derived from co-tenure at mine 4103140; source `msha-controller-operator-history`.

- History rows: 6
- Typed edges: 13
- 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: 2026-10-18T09:31:49.615908+00:00.

## Assessment signals

1. **SAFETY — 0 since 2021:** Accidents and injuries 1 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 56 since 2021:** Violations and penalties 233 violation rows across the full record; 80 carry an S&S flag and $104,613 appears in current assessed amounts.
3. **HEALTH — 10 samples:** Occupational health samples 10 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 18K employee hours and 22 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 — 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 — 14 since 2021:** Inspections 81 inspection events and 977 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 56.14107 — Moving machine parts.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **30 CFR 56.20013 — Waste receptacles.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20013
- **30 CFR 56.20003 — Housekeeping.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **30 CFR 56.12008 — Insulation and fittings for power wires and cables.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12008
- **30 CFR 48.28 — Annual refresher training of miners; minimum courses of instruction; hours of instruction.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-48/subpart-B/section-48.28
- **30 CFR 56.11002 — Handrails and toeboards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11002
- **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 56.11012 — Protection for openings around travelways.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11012
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 1 rows; 2012-04-13 through 2012-04-13; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1999-12-15 through 1999-12-15; source ID `msha-addresses`
- **Assessed Violations:** 229 rows; 2000-05-16 through 2026-07-28; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2011-07-13 through 2013-02-28; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 4 rows; 2010-05-25 through 2010-12-08; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 27 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 8 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 6 rows; 1982-10-01 through 2019-12-01; source ID `msha-controller-operator-history`
- **Inspections:** 81 rows; 2000-05-16 through 2026-07-27; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 212 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:** 10 rows; 2010-05-26 through 2026-07-29; source ID `msha-personal-health-samples`
- **Violations:** 233 rows; 2000-05-16 through 2026-07-28; 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/alto-bonito-gravel-pit-4103140`
- JSON: `/api/v1/mines/alto-bonito-gravel-pit-4103140`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4103140/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4103140/relationships`
- MCP resource: `mine://4103140/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`