# Milton Plant

- **MSHA mine ID:** 1504266
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Carroll, KY
- **Operator:** Nugent Sand Company
- **Controller:** N S C Corp; Sibo Services Inc
- **Public source rows linked:** 1,437
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**N S C Corp; Sibo Services Inc (M05932) → Nugent Sand Company (L07463) → Milton Plant (1504266)**

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

## Controller and operator valid-time history

- **Martin Marietta Materials Inc → Martin Marietta Aggregates:** 1950-01-01 through 1987-11-23; derived from co-tenure at mine 1504266; source `msha-controller-operator-history`.
- **Sibo Services Inc et al → Nugent Sand Company:** 1987-11-24 through current/open; derived from co-tenure at mine 1504266; source `msha-controller-operator-history`.
- **N S C Corp et al → Nugent Sand Company:** 1987-11-24 through current/open; derived from co-tenure at mine 1504266; 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 — 2 since 2021:** Accidents and injuries 15 historical accident/injury rows; 0 coded fatalities and 148 lost days across the published record.
2. **COMPLIANCE — 22 since 2021:** Violations and penalties 97 violation rows across the full record; 10 carry an S&S flag and $12,125 appears in current assessed amounts.
3. **HEALTH — 44 samples:** Occupational health samples 44 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 21K employee hours and 33 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 8 linked rows:** Contests, conferences and decisions 2 contested-violation rows, 2 civil-penalty docket/decision rows, and 4 conference records linked by issuance number.
6. **CONTRACTORS — 5 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 — 17 since 2021:** Inspections 74 inspection events and 2K 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 56.14100 — Safety defects; examination, correction and records.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **30 CFR 56.12021 — Danger signs.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12021
- **30 CFR 56.12018 — Identification of power switches.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12018
- **30 CFR 50.30 — Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-D/section-50.30
- **30 CFR 56.23002 — Written safety program.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-T/section-56.23002
- **30 CFR 46.8 — Annual refresher training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.8
- **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 56.14201 — Conveyor start-up warnings.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14201
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 15 rows; 2001-05-17 through 2025-01-16; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2011-10-17 through 2011-10-17; source ID `msha-addresses`
- **Assessed Violations:** 95 rows; 2000-01-24 through 2026-06-24; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 2 rows; 2024-09-16 through 2024-09-16; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 4 rows; 2007-11-07 through 2007-11-07; source ID `msha-conferences`
- **Contested Violations:** 2 rows; 2024-02-07 through 2024-02-07; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 694 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 139 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 3 rows; 1950-01-01 through 1987-11-24; source ID `msha-controller-operator-history`
- **Inspections:** 74 rows; 2000-01-24 through 2026-06-23; 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:** 44 rows; 2002-01-30 through 2025-10-21; source ID `msha-personal-health-samples`
- **Violations:** 97 rows; 2000-01-24 through 2026-06-24; 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/milton-plant-1504266`
- JSON: `/api/v1/mines/milton-plant-1504266`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1504266/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1504266/relationships`
- MCP resource: `mine://1504266/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`