# G E M Materials Inc

- **MSHA mine ID:** 4101903
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Bexar, TX
- **Operator:** G E M Materials Inc
- **Controller:** Janice  Friesenhahn
- **Public source rows linked:** 513
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Janice  Friesenhahn (M33465) → G E M Materials Inc (L33465) → G E M Materials Inc (4101903)**

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

## Controller and operator valid-time history

- **Janice  Friesenhahn et al → G E M Materials Inc:** 1950-01-01 through current/open; derived from co-tenure at mine 4101903; source `msha-controller-operator-history`.

- History rows: 1
- Typed edges: 3
- 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 — 26 since 2021:** Violations and penalties 82 violation rows across the full record; 14 carry an S&S flag and $9,245 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 5K employee hours and 7 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 63 inspection events and 613 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 56.9100 — Traffic control.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9100
- **30 CFR 56.12023 — Guarding electrical connections and resistor grids.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12023
- **30 CFR 56.14100 — Safety defects; examination, correction and records.** (4 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **30 CFR 56.4130 — Electric substations and liquid storage facilities.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4130
- **30 CFR 56.4200 — General requirements.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4200
- **30 CFR 56.4500 — Heat sources.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4500
- **30 CFR 56.9300 — Berms or guardrails.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9300

## Source coverage

- **Addresses of Record:** 1 rows; 1999-05-11 through 1999-05-11; source ID `msha-addresses`
- **Assessed Violations:** 82 rows; 2000-05-31 through 2026-05-12; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2008-06-18 through 2014-08-11; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 4 rows; 2007-05-30 through 2013-11-21; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 4 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 2 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 1 rows; 1950-01-01 through 1950-01-01; source ID `msha-controller-operator-history`
- **Inspections:** 63 rows; 2000-05-31 through 2026-05-18; 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:** 3 rows; 2013-08-28 through 2024-02-22; source ID `msha-personal-health-samples`
- **Violations:** 82 rows; 2000-05-31 through 2026-05-12; 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/g-e-m-materials-inc-4101903`
- JSON: `/api/v1/mines/g-e-m-materials-inc-4101903`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4101903/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4101903/relationships`
- MCP resource: `mine://4101903/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`