# Portable Unit #1

- **MSHA mine ID:** 4701111
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** Rock, WI
- **Operator:** Bjoin Limestone Inc
- **Controller:** Kristopher P  Bjoin; Shaun M  Bjoin; Jonathan M  Bjoin
- **Public source rows linked:** 887
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Kristopher P  Bjoin; Shaun M  Bjoin; Jonathan M  Bjoin (0129421) → Bjoin Limestone Inc (L00393) → Portable Unit #1 (4701111)**

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

## Controller and operator valid-time history

- **Onsgard Limestone → Onsgard Limestone:** 1950-01-01 through 1978-06-30; derived from co-tenure at mine 4701111; source `msha-controller-operator-history`.
- **Kathleen M  Bjoin et al → Bjoin Limestone Inc:** 1978-07-01 through 2014-04-30; derived from co-tenure at mine 4701111; source `msha-controller-operator-history`.
- **Shaun M  Bjoin → Bjoin Limestone Inc:** 2014-05-01 through current/open; derived from co-tenure at mine 4701111; source `msha-controller-operator-history`.
- **Kristopher P  Bjoin → Bjoin Limestone Inc:** 2014-05-01 through current/open; derived from co-tenure at mine 4701111; source `msha-controller-operator-history`.
- **Jonathan M  Bjoin → Bjoin Limestone Inc:** 2014-05-01 through current/open; derived from co-tenure at mine 4701111; source `msha-controller-operator-history`.

- History rows: 5
- Typed edges: 10
- 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 3 historical accident/injury rows; 0 coded fatalities and 126 lost days across the published record.
2. **COMPLIANCE — 13 since 2021:** Violations and penalties 137 violation rows across the full record; 31 carry an S&S flag and $16,355 appears in current assessed amounts.
3. **HEALTH — 10 samples:** Occupational health samples 10 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 4K employee hours and 8 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 39 linked rows:** Contests, conferences and decisions 15 contested-violation rows, 23 civil-penalty docket/decision rows, and 1 conference records linked by issuance number.
6. **CONTRACTORS — 3 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 — 10 since 2021:** Inspections 64 inspection events and 975 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 56.14101 — Brakes.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14101
- **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 46.11 — Site-specific hazard awareness training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.11
- **30 CFR 56.15005 — Safety belts and lines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-N/section-56.15005
- **30 CFR 47.44 — Temporary, portable containers.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.44
- **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 56.14107 — 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 56.9300 — 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 46.9 — Records of training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.9
- **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 56.12028 — 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:** 3 rows; 2007-06-15 through 2025-05-30; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2025-11-05 through 2025-11-05; source ID `msha-addresses`
- **Assessed Violations:** 137 rows; 2001-05-15 through 2026-07-22; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 23 rows; 2004-04-27 through 2016-06-30; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 1 rows; 2015-10-30 through 2015-10-30; source ID `msha-conferences`
- **Contested Violations:** 15 rows; 2003-12-03 through 2015-10-07; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 180 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 58 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 5 rows; 1950-01-01 through 1978-07-01; source ID `msha-controller-operator-history`
- **Inspections:** 64 rows; 2000-09-21 through 2026-07-22; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 201 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 51 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:** 10 rows; 2003-12-03 through 2020-03-04; source ID `msha-personal-health-samples`
- **Violations:** 137 rows; 2001-05-15 through 2026-07-22; 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-unit-1-4701111`
- JSON: `/api/v1/mines/portable-unit-1-4701111`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4701111/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4701111/relationships`
- MCP resource: `mine://4701111/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`