# San Isidro North

- **MSHA mine ID:** 4104649
- **Status:** Abandoned
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Webb, TX
- **Operator:** San Isidro Ready Mix Ltd.
- **Controller:** San Isidro Management LC; Blackstone Dilworth 1998 Trust
- **Public source rows linked:** 44
- **Source coverage:** 10 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**San Isidro Management LC; Blackstone Dilworth 1998 Trust (0043493) → San Isidro Ready Mix Ltd. (0052617) → San Isidro North (4104649)**

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

## Controller and operator valid-time history

- **Blackstone Dilworth 1998 Trust et al → San Isidro Ready Mix Ltd.:** 2007-03-02 through current/open; derived from co-tenure at mine 4104649; source `msha-controller-operator-history`.
- **San Isidro Management LC et al → San Isidro Ready Mix Ltd.:** 2007-03-02 through current/open; derived from co-tenure at mine 4104649; source `msha-controller-operator-history`.

- History rows: 2
- Typed edges: 4
- 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 8 violation rows across the full record; 1 carry an S&S flag and $2,700 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 3K employee hours and 5 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 2 linked rows:** Contests, conferences and decisions 0 contested-violation rows, 0 civil-penalty docket/decision rows, and 2 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 7 inspection events and 69 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 56.12027 — Grounding mobile equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12027
- **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 56.12008 — 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 56.14206 — Securing movable parts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14206
- **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 56.16005 — Securing gas cylinders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16005
- **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

## Source coverage

- **Addresses of Record:** 1 rows; 2009-10-01 through 2009-10-01; source ID `msha-addresses`
- **Assessed Violations:** 8 rows; 2008-01-30 through 2008-12-10; source ID `msha-assessed-violations`
- **Conferences:** 2 rows; 2008-04-15 through 2008-04-15; source ID `msha-conferences`
- **Controller and Operator History:** 2 rows; 2007-03-02 through 2007-03-02; source ID `msha-controller-operator-history`
- **Inspections:** 7 rows; 2007-06-20 through 2009-10-15; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 10 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 3 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; 2008-01-30 through 2008-01-30; source ID `msha-personal-health-samples`
- **Violations:** 8 rows; 2008-01-30 through 2008-12-10; 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/san-isidro-north-4104649`
- JSON: `/api/v1/mines/san-isidro-north-4104649`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4104649/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4104649/relationships`
- MCP resource: `mine://4104649/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`