# Casper Pit

- **MSHA mine ID:** 4800715
- **Status:** Temporarily Idled
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Natrona, WY
- **Operator:** JTL Group, Inc.
- **Controller:** Knife River Corporation
- **Public source rows linked:** 319
- **Source coverage:** 12 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Knife River Corporation (0176802) → JTL Group, Inc. (0075003) → Casper Pit (4800715)**

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

## Controller and operator valid-time history

- **United Companies → Casper Concrete Company:** 1950-01-01 through 1990-06-30; derived from co-tenure at mine 4800715; source `msha-controller-operator-history`.
- **JTL Group Inc → Jtl Group Inc:** 1990-07-01 through 1999-08-31; derived from co-tenure at mine 4800715; source `msha-controller-operator-history`.
- **MDU Resources Group Inc → JTL Group, Inc.:** 1999-09-01 through 2023-05-31; derived from co-tenure at mine 4800715; source `msha-controller-operator-history`.
- **Knife River Corporation → JTL Group, Inc.:** 2023-06-01 through current/open; derived from co-tenure at mine 4800715; source `msha-controller-operator-history`.

- History rows: 4
- Typed edges: 11
- 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 — 0 since 2021:** Accidents and injuries 3 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 2 since 2021:** Violations and penalties 32 violation rows across the full record; 3 carry an S&S flag and $7,234 appears in current assessed amounts.
3. **HEALTH — 16 samples:** Occupational health samples 16 personal. 1 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 0 employee hours and 0 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 4 linked rows:** Contests, conferences and decisions 2 contested-violation rows, 2 civil-penalty docket/decision rows, and 0 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 — 5 since 2021:** Inspections 40 inspection events and 492 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 56.1000 — Notification of commencement of operations and closing of mines.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-A/section-56.1000
- **30 CFR 56.12013 — Splices and repairs of power cables.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12013
- **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 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 57.14109 — Unguarded conveyors with adjacent travelways.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-57/subpart-M/section-57.14109
- **30 CFR 56.4201 — Inspection.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4201
- **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 56.14100 — 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 56.14107 — 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 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

## Source coverage

- **Accident, Injuries, and Illnesses:** 3 rows; 2001-12-05 through 2004-06-22; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2025-04-09 through 2025-04-09; source ID `msha-addresses`
- **Assessed Violations:** 32 rows; 2003-12-09 through 2022-07-13; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 2 rows; 2020-12-11 through 2020-12-11; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 2 rows; 2020-03-25 through 2020-03-25; source ID `msha-contested-violations`
- **Controller and Operator History:** 4 rows; 1950-01-01 through 1999-09-01; source ID `msha-controller-operator-history`
- **Inspections:** 40 rows; 2001-03-28 through 2024-03-25; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 152 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 34 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:** 16 rows; 2002-05-21 through 2014-10-23; source ID `msha-personal-health-samples`
- **Violations:** 32 rows; 2003-12-09 through 2022-07-13; 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/casper-pit-4800715`
- JSON: `/api/v1/mines/casper-pit-4800715`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4800715/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4800715/relationships`
- MCP resource: `mine://4800715/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`