# Sanderling Dredge

- **MSHA mine ID:** 4503687
- **Status:** Active
- **Type / commodity:** Surface / Sand, Industrial NEC
- **Location:** Columbia, OR
- **Operator:** CalPortland Company
- **Controller:** Taiheiyo Cement Corp
- **Public source rows linked:** 243
- **Source coverage:** 11 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Taiheiyo Cement Corp (M07897) → CalPortland Company (L11900) → Sanderling Dredge (4503687)**

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

## Controller and operator valid-time history

- **Taiheiyo Cement Corp → CalPortland Company:** 2011-01-04 through current/open; derived from co-tenure at mine 4503687; 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 — 4 since 2021:** Accidents and injuries 7 historical accident/injury rows; 0 coded fatalities and 24 lost days across the published record.
2. **COMPLIANCE — 7 since 2021:** Violations and penalties 17 violation rows across the full record; 3 carry an S&S flag and $9,958 appears in current assessed amounts.
3. **HEALTH — 4 samples:** Occupational health samples 4 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 2K employee hours and 7 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 — 13 since 2021:** Inspections 36 inspection events and 320 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 56.12028 — Testing grounding systems.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12028
- **30 CFR 50.20-1 — General instructions for completing MSHA Form 7000-1.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-C/section-50.20-1
- **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 56.12004 — Electrical conductors.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **30 CFR 56.12002 — Controls and switches.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12002
- **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 56.4530 — Exits.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4530
- **30 CFR 41.12 — Changes; notification by operator.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-G/part-41/subpart-B/section-41.12
- **30 CFR 56.14100 — Safety defects; examination, correction and records.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **30 CFR 56.15020 — Life jackets and belts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15020

## Source coverage

- **Accident, Injuries, and Illnesses:** 7 rows; 2014-01-07 through 2025-05-28; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2011-11-22 through 2011-11-22; source ID `msha-addresses`
- **Assessed Violations:** 17 rows; 2013-01-17 through 2025-02-05; source ID `msha-assessed-violations`
- **Conferences:** 2 rows; 2018-05-21 through 2020-03-19; source ID `msha-conferences`
- **Controller and Operator History:** 1 rows; 2011-01-04 through 2011-01-04; source ID `msha-controller-operator-history`
- **Inspections:** 36 rows; 2011-06-02 through 2026-05-28; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 124 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 33 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:** 4 rows; 2020-09-02 through 2025-02-06; source ID `msha-personal-health-samples`
- **Violations:** 17 rows; 2013-01-17 through 2025-02-05; 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/sanderling-dredge-4503687`
- JSON: `/api/v1/mines/sanderling-dredge-4503687`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4503687/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4503687/relationships`
- MCP resource: `mine://4503687/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`