# GREBNER-OLESON PIT

- **MSHA mine ID:** 1301615
- **Status:** Active
- **Type / commodity:** Surface / Gypsum
- **Location:** Webster, IA
- **Operator:** Gold Bond Building Products, LLC
- **Controller:** NG Operations LLC
- **Public source rows linked:** 1,187
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**NG Operations LLC (0160281) → Gold Bond Building Products, LLC (0175133) → GREBNER-OLESON PIT (1301615)**

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

## Controller and operator valid-time history

- **Lafarge S A → Gold Bond Building Products:** 1950-01-01 through 1993-06-30; derived from co-tenure at mine 1301615; source `msha-controller-operator-history`.
- **National Gypsum Company → National Gypsum Company:** 1993-07-01 through 1995-09-20; derived from co-tenure at mine 1301615; source `msha-controller-operator-history`.
- **Spangler Companies Inc → National Gypsum Company:** 1995-09-21 through 2020-12-31; derived from co-tenure at mine 1301615; source `msha-controller-operator-history`.
- **NG Operations LLC → Gold Bond Building Products, LLC:** 2021-01-01 through current/open; derived from co-tenure at mine 1301615; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 12
- 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 — 2 since 2021:** Accidents and injuries 6 historical accident/injury rows; 0 coded fatalities and 685 lost days across the published record.
2. **COMPLIANCE — 28 since 2021:** Violations and penalties 95 violation rows across the full record; 10 carry an S&S flag and $17,346 appears in current assessed amounts.
3. **HEALTH — 18 samples:** Occupational health samples 18 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 6K employee hours and 12 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 15 linked rows:** Contests, conferences and decisions 5 contested-violation rows, 8 civil-penalty docket/decision rows, and 2 conference records linked by issuance number.
6. **CONTRACTORS — 2 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 — 24 since 2021:** Inspections 71 inspection events and 764 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 56.14206 — 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 56.14100 — 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 56.14132 — Horns and backup alarms.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132
- **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
- **30 CFR 48.26 — Experienced miner training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-48/subpart-B/section-48.26
- **30 CFR 56.4402 — Safety can use.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4402
- **30 CFR 56.4201 — Inspection.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4201
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 6 rows; 2000-12-20 through 2026-05-01; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 1975-01-29 through 1975-01-29; source ID `msha-addresses`
- **Assessed Violations:** 95 rows; 2001-06-11 through 2025-10-20; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 8 rows; 2000-12-12 through 2017-09-27; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 2 rows; 2006-12-12 through 2006-12-12; source ID `msha-conferences`
- **Contested Violations:** 5 rows; 2009-05-07 through 2017-03-06; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 499 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 128 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 4 rows; 1950-01-01 through 2021-01-01; source ID `msha-controller-operator-history`
- **Inspections:** 71 rows; 2001-01-03 through 2026-09-15; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 202 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 52 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:** 18 rows; 2001-06-11 through 2025-10-21; source ID `msha-personal-health-samples`
- **Violations:** 95 rows; 2001-06-11 through 2025-10-20; 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/grebner-oleson-pit-1301615`
- JSON: `/api/v1/mines/grebner-oleson-pit-1301615`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1301615/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1301615/relationships`
- MCP resource: `mine://1301615/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`