# M G Building Materials Aggr Div, LTD

- **MSHA mine ID:** 4104155
- **Status:** Abandoned
- **Type / commodity:** Surface / Dimension Stone NEC
- **Location:** Medina, TX
- **Operator:** M G Building Materials Aggr Div. LTD
- **Controller:** Larry  Grothues; Alen  Grothues
- **Public source rows linked:** 1,578
- **Source coverage:** 12 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Larry  Grothues; Alen  Grothues (0041927) → M G Building Materials Aggr Div. LTD (0051404) → M G Building Materials Aggr Div, LTD (4104155)**

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

## Controller and operator valid-time history

- **Stephen C  Miller  et al → Alamo Reserve Ltd:** 2000-02-01 through 2003-05-05; derived from co-tenure at mine 4104155; source `msha-controller-operator-history`.
- **Larry  Grothues et al → M G Building Materials Aggr Div. LTD:** 2003-05-06 through current/open; derived from co-tenure at mine 4104155; source `msha-controller-operator-history`.
- **Alen  Grothues et al → M G Building Materials Aggr Div. LTD:** 2003-05-06 through current/open; derived from co-tenure at mine 4104155; source `msha-controller-operator-history`.

- History rows: 3
- Typed edges: 7
- 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 3 historical accident/injury rows; 0 coded fatalities and 113 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 105 violation rows across the full record; 30 carry an S&S flag and $16,505 appears in current assessed amounts.
3. **HEALTH — 3 samples:** Occupational health samples 3 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 11K employee hours and 21 summed average employees across reported subunits in the latest published quarter.
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 — 3 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 28 inspection events and 374 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 56.14101 — Brakes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14101
- **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 56.14103 — Operators stations.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14103
- **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 56.11012 — 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 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 56.14112 — 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 56.12018 — 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 56.12016 — Work on electrically-powered equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12016
- **30 CFR 56.14100 — Safety defects; examination, correction and records.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100

## Source coverage

- **Accident, Injuries, and Illnesses:** 3 rows; 2001-05-10 through 2006-02-08; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2007-12-18 through 2007-12-18; source ID `msha-addresses`
- **Assessed Violations:** 105 rows; 2000-04-13 through 2007-05-03; source ID `msha-assessed-violations`
- **Contractor Employment and Production — Quarterly:** 979 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 258 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 2000-02-01 through 2003-05-06; source ID `msha-controller-operator-history`
- **Inspections:** 28 rows; 2000-04-13 through 2007-05-03; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 73 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 19 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:** 3 rows; 2001-02-07 through 2001-02-07; source ID `msha-personal-health-samples`
- **Violations:** 105 rows; 2000-04-13 through 2007-05-03; 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/m-g-building-materials-aggr-div-ltd-4104155`
- JSON: `/api/v1/mines/m-g-building-materials-aggr-div-ltd-4104155`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4104155/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4104155/relationships`
- MCP resource: `mine://4104155/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`