# Wyoming Hereford Ranch Pit

- **MSHA mine ID:** 0503839
- **Status:** Abandoned
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Larimer, CO
- **Operator:** Don Kehn Construction Inc
- **Controller:** Don  Kehn
- **Public source rows linked:** 334
- **Source coverage:** 12 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Don  Kehn (M04977) → Don Kehn Construction Inc (L06242) → Wyoming Hereford Ranch Pit (0503839)**

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

## Controller and operator valid-time history

- **Don  Kehn → Don Kehn Construction Inc:** 1983-03-01 through current/open; derived from co-tenure at mine 0503839; 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: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 0 since 2021:** Accidents and injuries 2 historical accident/injury rows; 0 coded fatalities and 7 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 106 violation rows across the full record; 34 carry an S&S flag and $31,728 appears in current assessed amounts.
3. **HEALTH — 5 samples:** Occupational health samples 5 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 1K employee hours and 4 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 39 linked rows:** Contests, conferences and decisions 19 contested-violation rows, 20 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 — 0 since 2021:** Inspections 42 inspection events and 429 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 41.11 — Notification by operator.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-G/part-41/subpart-B/section-41.11
- **30 CFR 46.6 — Newly hired experienced miner training.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.6
- **30 CFR 56.14101 — Brakes.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14101
- **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 56.12004 — 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 56.12028 — 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
- **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 56.18002 — Examination of working places.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18002
- **30 CFR 46.5 — New miner training.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.5

## Source coverage

- **Accident, Injuries, and Illnesses:** 2 rows; 2003-07-11 through 2003-08-19; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2021-05-25 through 2021-05-25; source ID `msha-addresses`
- **Assessed Violations:** 104 rows; 2000-02-08 through 2019-06-11; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 20 rows; 2003-01-22 through 2013-08-15; source ID `msha-civil-penalty-dockets-decisions`
- **Contested Violations:** 19 rows; 2007-11-27 through 2012-09-10; source ID `msha-contested-violations`
- **Controller and Operator History:** 1 rows; 1983-03-01 through 1983-03-01; source ID `msha-controller-operator-history`
- **Inspections:** 42 rows; 2000-02-08 through 2020-03-30; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 12 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 21 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:** 5 rows; 2003-05-14 through 2019-06-12; source ID `msha-personal-health-samples`
- **Violations:** 106 rows; 2000-02-08 through 2019-06-11; 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/wyoming-hereford-ranch-pit-0503839`
- JSON: `/api/v1/mines/wyoming-hereford-ranch-pit-0503839`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0503839/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0503839/relationships`
- MCP resource: `mine://0503839/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`