# Portable Lime Screen

- **MSHA mine ID:** 1302050
- **Status:** Intermittent
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** Tama, IA
- **Operator:** Cessford Construction Co
- **Controller:** CRH PLC
- **Public source rows linked:** 250
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**CRH PLC (M06183) → Cessford Construction Co (0085824) → Portable Lime Screen (1302050)**

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

## Controller and operator valid-time history

- **Heidi Cessford  Krabbe et al → Cessford Construction Company:** 1985-05-01 through 2007-08-23; derived from co-tenure at mine 1302050; source `msha-controller-operator-history`.
- **CRH PLC → Cessford Construction Company:** 2007-08-24 through 2008-01-08; derived from co-tenure at mine 1302050; source `msha-controller-operator-history`.
- **CRH PLC → Cessford Construction Co:** 2008-01-09 through current/open; derived from co-tenure at mine 1302050; source `msha-controller-operator-history`.

- History rows: 3
- Typed edges: 8
- 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: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 0 since 2021:** Accidents and injuries 7 historical accident/injury rows; 0 coded fatalities and 28 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 54 violation rows across the full record; 14 carry an S&S flag and $6,255 appears in current assessed amounts.
3. **HEALTH — 13 samples:** Occupational health samples 13 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 7K employee hours and 15 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 11 linked rows:** Contests, conferences and decisions 4 contested-violation rows, 4 civil-penalty docket/decision rows, and 3 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 — 3 since 2021:** Inspections 37 inspection events and 360 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 56.11001 — Safe access.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11001
- **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 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 56.11012 — 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 56.12004 — Electrical conductors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **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 56.14132 — 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 56.14101 — Brakes.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14101
- **30 CFR 56.12028 — Testing grounding systems.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12028

## Source coverage

- **Accident, Injuries, and Illnesses:** 7 rows; 2000-05-16 through 2009-10-26; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2026-10-07 through 2026-10-07; source ID `msha-addresses`
- **Assessed Violations:** 53 rows; 2000-08-09 through 2009-05-05; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2009-04-23 through 2010-06-25; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 3 rows; 2000-08-21 through 2006-06-21; source ID `msha-conferences`
- **Contested Violations:** 4 rows; 2008-04-09 through 2009-05-04; source ID `msha-contested-violations`
- **Controller and Operator History:** 3 rows; 1985-05-01 through 2008-01-09; source ID `msha-controller-operator-history`
- **Inspections:** 37 rows; 2000-08-09 through 2023-02-21; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 34 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 36 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:** 13 rows; 2004-11-03 through 2023-02-22; source ID `msha-personal-health-samples`
- **Violations:** 54 rows; 2000-08-09 through 2009-05-05; 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/portable-lime-screen-1302050`
- JSON: `/api/v1/mines/portable-lime-screen-1302050`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1302050/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1302050/relationships`
- MCP resource: `mine://1302050/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`