# 3DW Mines

- **MSHA mine ID:** 0500198
- **Status:** Abandoned
- **Type / commodity:** Surface / Fire Clay
- **Location:** Jefferson, CO
- **Operator:** Acme Brick Company
- **Controller:** Berkshire Hathaway Inc
- **Public source rows linked:** 360
- **Source coverage:** 12 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Berkshire Hathaway Inc (M13643) → Acme Brick Company (L17877) → 3DW Mines (0500198)**

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

## Controller and operator valid-time history

- **Kevin  Croke → Denver Brick & Pipe Company:** 1950-01-01 through 1984-01-19; derived from co-tenure at mine 0500198; source `msha-controller-operator-history`.
- **Harold W  Emrich  et al → Denver Brick Company:** 1984-01-20 through 1990-02-25; derived from co-tenure at mine 0500198; source `msha-controller-operator-history`.
- **Jaqueline  Simkin → Denver Brick Company:** 1990-02-26 through 2001-08-30; derived from co-tenure at mine 0500198; source `msha-controller-operator-history`.
- **Berkshire Hathaway Inc → Acme Brick Company:** 2001-08-31 through 2003-02-02; derived from co-tenure at mine 0500198; source `msha-controller-operator-history`.
- **Berkshire Hathaway Inc → Acme Building Brands:** 2003-02-03 through 2005-09-05; derived from co-tenure at mine 0500198; source `msha-controller-operator-history`.
- **Berkshire Hathaway Inc → Acme Brick Company:** 2005-09-06 through current/open; derived from co-tenure at mine 0500198; source `msha-controller-operator-history`.

- History rows: 6
- Typed edges: 17
- 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 0 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 21 violation rows across the full record; 3 carry an S&S flag and $1,999 appears in current assessed amounts.
3. **HEALTH — 2 samples:** Occupational health samples 2 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 0 employee hours and 0 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 — 5 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 18 inspection events and 208 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 56.4230 — Self-propelled equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4230
- **30 CFR 56.4101 — Warning signs.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4101
- **30 CFR 56.14207 — Parking procedures for unattended equipment.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14207
- **30 CFR 46.5 — New miner training.** (3 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.5
- **30 CFR 56.4104 — Combustible waste.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4104
- **30 CFR 56.1000 — Notification of commencement of operations and closing of mines.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-A/section-56.1000
- **30 CFR 50.30 — Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-I/part-50/subpart-D/section-50.30

## Source coverage

- **Addresses of Record:** 1 rows; 2021-05-26 through 2021-05-26; source ID `msha-addresses`
- **Assessed Violations:** 21 rows; 2000-12-28 through 2016-09-21; source ID `msha-assessed-violations`
- **Conferences:** 2 rows; 2005-09-02 through 2008-10-15; source ID `msha-conferences`
- **Contractor Employment and Production — Quarterly:** 124 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 32 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 6 rows; 1950-01-01 through 2005-09-06; source ID `msha-controller-operator-history`
- **Inspections:** 18 rows; 2000-04-19 through 2016-09-21; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 108 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 24 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:** 2 rows; 2016-09-21 through 2016-09-21; source ID `msha-personal-health-samples`
- **Violations:** 21 rows; 2000-12-28 through 2016-09-21; 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/3dw-mines-0500198`
- JSON: `/api/v1/mines/3dw-mines-0500198`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0500198/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0500198/relationships`
- MCP resource: `mine://0500198/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`