# Marriottsville Quarry

- **MSHA mine ID:** 1800010
- **Status:** Abandoned
- **Type / commodity:** Surface / Crushed, Broken Limestone NEC
- **Location:** Baltimore, MD
- **Operator:** Bluegrass Materials Company, LLC
- **Controller:** Martin Marietta Materials Inc
- **Public source rows linked:** 1,275
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Martin Marietta Materials Inc (M00174) → Bluegrass Materials Company, LLC (0113025) → Marriottsville Quarry (1800010)**

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

## Controller and operator valid-time history

- **Flintkote Company → Flintkote Stone Products Company:** 1950-01-01 through 1980-04-06; derived from co-tenure at mine 1800010; source `msha-controller-operator-history`.
- **Cimenteries Cbr Cementbedrijven → Genstar Stone Products Company:** 1980-04-07 through 1986-11-03; derived from co-tenure at mine 1800010; source `msha-controller-operator-history`.
- **Redland Plc → Redland Genstar Inc:** 1986-11-04 through 1998-02-10; derived from co-tenure at mine 1800010; source `msha-controller-operator-history`.
- **Lafarge S A → Lafarge Mid-Atlantic, Inc.:** 1998-02-11 through 2009-05-04; derived from co-tenure at mine 1800010; source `msha-controller-operator-history`.
- **Lafarge S A → Lafarge Mid-Atlantic, LLC:** 2009-05-05 through 2014-02-12; derived from co-tenure at mine 1800010; source `msha-controller-operator-history`.
- **Panadero Aggregates Holdings, LLC → Bluegrass Materials Company, LLC:** 2014-02-13 through 2018-04-26; derived from co-tenure at mine 1800010; source `msha-controller-operator-history`.
- **Martin Marietta Materials Inc → Bluegrass Materials Company, LLC:** 2018-04-27 through current/open; derived from co-tenure at mine 1800010; source `msha-controller-operator-history`.

- History rows: 7
- Typed edges: 20
- 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 6 historical accident/injury rows; 0 coded fatalities and 173 lost days across the published record.
2. **COMPLIANCE — 0 since 2021:** Violations and penalties 69 violation rows across the full record; 10 carry an S&S flag and $20,165 appears in current assessed amounts.
3. **HEALTH — 7 samples:** Occupational health samples 7 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 11K employee hours and 23 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 32 linked rows:** Contests, conferences and decisions 12 contested-violation rows, 13 civil-penalty docket/decision rows, and 7 conference records linked by issuance number.
6. **CONTRACTORS — 7 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 34 inspection events and 636 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 56.15005 — 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 46.8 — Annual refresher training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.8
- **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 56.14100 — 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 56.4104 — 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 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 56.14107 — 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.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132
- **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 56.14112 — Construction and maintenance of guards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **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

## Source coverage

- **Accident, Injuries, and Illnesses:** 6 rows; 2000-11-18 through 2007-01-12; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2016-10-21 through 2016-10-21; source ID `msha-addresses`
- **Assessed Violations:** 68 rows; 2001-01-11 through 2014-10-07; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 13 rows; 2003-07-25 through 2010-08-30; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 7 rows; 2002-04-23 through 2007-03-30; source ID `msha-conferences`
- **Contested Violations:** 12 rows; 2004-10-26 through 2009-08-18; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 826 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 155 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 7 rows; 1950-01-01 through 2014-02-13; source ID `msha-controller-operator-history`
- **Inspections:** 34 rows; 2000-08-14 through 2015-10-05; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 36 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 33 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:** 7 rows; 2005-07-21 through 2007-06-21; source ID `msha-personal-health-samples`
- **Violations:** 69 rows; 2001-01-11 through 2014-10-07; 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/marriottsville-quarry-1800010`
- JSON: `/api/v1/mines/marriottsville-quarry-1800010`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/1800010/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/1800010/relationships`
- MCP resource: `mine://1800010/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`