Data / Mines / Maryland / Stone mines
Stone mines in Maryland: 29 open mines and MSHA citations
MSHA lists 29 open stone mines in Maryland, run by 22 operators and employing 863 people. Since January 1, 2022 its inspectors issued 653 citations and orders there with $316,360 in proposed penalties, and operators reported 71 injury or illness cases. The operators with the most open mines are Bluegrass Materials Company, LLC; Vulcan Construction Materials, LLC; Laurel Sand & Gravel, Inc.. Data from MSHA, November 6, 2026.
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- Open mines
- 29
- Operators
- 22
- Employees
- 863
- Active
- 25
- Temporarily Idled
- 3
- Intermittent
- 1
- Citations and orders since January 1, 2022
- 653
- Significant and substantial
- 102 (15.6%)
- Closure orders
- 7
- High negligence or reckless
- 24
- Proposed penalties
- $316,360
- Amount paid so far
- $309,462
- Inspections
- 388
- Inspector hours on site
- 6,128
- Citations per inspection
- 1.68 (all mines 2.30)
- Accident reports
- 75
- Injury and illness cases
- 71
- Fatalities
- 0
- Latest MSHA record
- November 2, 2026
Operators with the most open mines in Maryland
Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Bluegrass Materials Company, LLC | 5 | 128 | 38 | $6,502 | 6 |
| Vulcan Construction Materials, LLC | 2 | 106 | 22 | $3,958 | 11 |
| Laurel Sand & Gravel, Inc. | 2 | 47 | 16 | $2,944 | 7 |
| Martin Marietta Materials, Inc. | 2 | 27 | 2 | $302 | 2 |
| Holcim (US) Incorporated | 1 | 106 | 213 | $145,856 | 12 |
| Lehigh Cement Company LLC | 1 | 175 | 142 | $93,542 | 14 |
| Amrize Mid-Atlantic Inc. | 1 | 24 | 58 | $32,772 | 1 |
| Savage Stone, LLC | 1 | 54 | 26 | $4,176 | 2 |
| Patapsco Natural Stone Quarry LLC | 1 | 5 | 24 | $5,914 | 0 |
| York Building Products Co Inc | 1 | 25 | 19 | $3,309 | 6 |
| Allan Myers Materials, MD | 1 | 32 | 15 | $2,191 | 1 |
| Maryland Minerals Inc | 1 | 15 | 15 | $1,891 | 1 |
| M & S Stone Quarries Inc | 1 | 3 | 13 | $2,029 | 0 |
| Bedrock Enterprises, Inc | 1 | 4 | 12 | $5,422 | 0 |
| S W Barrick & Sons | 1 | 56 | 12 | $1,762 | 5 |
| Tri-State Stone & Building Supply Inc. | 1 | 22 | 12 | $1,732 | 1 |
| Allegany Aggregates Inc | 1 | 16 | 5 | $747 | 1 |
| Ritchie Trucking & Excavating, Inc. | 1 | 2 | 4 | $572 | 0 |
| Tamko Building Products LLC | 1 | 6 | 4 | $592 | 1 |
| Scott's Hauling and Excavating | 1 | 3 | 1 | $147 | 0 |
| Butler Artcraft Stone Corporation | 1 | 1 | 0 | $0 | 0 |
| Renard Lakes Holdings, LLC | 1 | 6 | 0 | $0 | 0 |
Operators with the most citations in Maryland
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Holcim (US) Incorporated | 1 | 106 | 213 | $145,856 | 12 |
| Lehigh Cement Company LLC | 1 | 175 | 142 | $93,542 | 14 |
| Amrize Mid-Atlantic Inc. | 1 | 24 | 58 | $32,772 | 1 |
| Bluegrass Materials Company, LLC | 5 | 128 | 38 | $6,502 | 6 |
| Savage Stone, LLC | 1 | 54 | 26 | $4,176 | 2 |
| Patapsco Natural Stone Quarry LLC | 1 | 5 | 24 | $5,914 | 0 |
| Vulcan Construction Materials, LLC | 2 | 106 | 22 | $3,958 | 11 |
| York Building Products Co Inc | 1 | 25 | 19 | $3,309 | 6 |
| Laurel Sand & Gravel, Inc. | 2 | 47 | 16 | $2,944 | 7 |
| Allan Myers Materials, MD | 1 | 32 | 15 | $2,191 | 1 |
| Maryland Minerals Inc | 1 | 15 | 15 | $1,891 | 1 |
| M & S Stone Quarries Inc | 1 | 3 | 13 | $2,029 | 0 |
| Bedrock Enterprises, Inc | 1 | 4 | 12 | $5,422 | 0 |
| S W Barrick & Sons | 1 | 56 | 12 | $1,762 | 5 |
| Tri-State Stone & Building Supply Inc. | 1 | 22 | 12 | $1,732 | 1 |
| Allegany Aggregates Inc | 1 | 16 | 5 | $747 | 1 |
| Ritchie Trucking & Excavating, Inc. | 1 | 2 | 4 | $572 | 0 |
| Tamko Building Products LLC | 1 | 6 | 4 | $592 | 1 |
| Martin Marietta Materials, Inc. | 2 | 27 | 2 | $302 | 2 |
| Scott's Hauling and Excavating | 1 | 3 | 1 | $147 | 0 |
| Butler Artcraft Stone Corporation | 1 | 1 | 0 | $0 | 0 |
| Renard Lakes Holdings, LLC | 1 | 6 | 0 | $0 | 0 |
Mines with the most citations
Open mines, ranked by citations and orders since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Amrize Hagerstown Facility | Holcim (US) Incorporated | Washington County, MD | Cement | 106 | 213 |
| Union Bridge MD | Lehigh Cement Company LLC | Carroll County, MD | Cement | 175 | 142 |
| Amrize Rockville Quarry | Amrize Mid-Atlantic Inc. | Montgomery County, MD | Crushed, broken granite | 24 | 58 |
| Savage Stone | Savage Stone, LLC | Howard County, MD | Crushed, broken granite | 54 | 26 |
| Patapsco Natural Stone Quarry LLC | Patapsco Natural Stone Quarry LLC | Howard County, MD | Dimension granite | 5 | 24 |
| Texas Quarry | Bluegrass Materials Company, LLC | Baltimore County, MD | Crushed, broken limestone | 38 | 21 |
| Principio Quarry | York Building Products Co Inc | Cecil County, MD | Crushed, broken granite | 25 | 19 |
| Havre De Grace Quarry | Vulcan Construction Materials, LLC | Harford County, MD | Crushed, broken traprock | 74 | 16 |
| Elk Mills Quarry | Allan Myers Materials, MD | Cecil County, MD | Crushed, broken granite | 32 | 15 |
| Thayerville Mine | Maryland Minerals Inc | Garrett County, MD | Crushed, broken limestone | 15 | 15 |
| M & S Stone Quarries Inc | M & S Stone Quarries Inc | Garrett County, MD | Dimension sandstone | 3 | 13 |
| S W Barrick & Sons | S W Barrick & Sons | Frederick County, MD | Crushed, broken limestone | 56 | 12 |
| Laurel Hill Quarry | Laurel Sand & Gravel, Inc. | Frederick County, MD | Crushed, broken stone | 29 | 12 |
| Carderock Quarries | Tri-State Stone & Building Supply Inc. | Montgomery County, MD | Crushed, broken stone | 22 | 12 |
| Bedrock Enterprises Inc | Bedrock Enterprises, Inc | Garrett County, MD | Dimension sandstone | 4 | 12 |
| Frederick Quarry | Bluegrass Materials Company, LLC | Frederick County, MD | Crushed, broken limestone | 27 | 7 |
| Frederick Quarry | Vulcan Construction Materials, LLC | Frederick County, MD | Crushed, broken limestone | 32 | 6 |
| North East Quarry | Bluegrass Materials Company, LLC | Cecil County, MD | Crushed, broken granite | 31 | 5 |
| Bedrock Quarry | Allegany Aggregates Inc | Allegany County, MD | Crushed, broken limestone | 16 | 5 |
| Beaver Creek Quarry | Laurel Sand & Gravel, Inc. | Washington County, MD | Crushed, broken limestone | 18 | 4 |
| Frederick Grinding Plant | Tamko Building Products LLC | Frederick County, MD | Crushed, broken limestone | 6 | 4 |
| Sand Bank Quarry | Ritchie Trucking & Excavating, Inc. | Allegany County, MD | Crushed, broken stone | 2 | 4 |
| Medford Quarry | Bluegrass Materials Company, LLC | Carroll County, MD | Crushed, broken limestone | 14 | 3 |
| Churchville Quarry | Bluegrass Materials Company, LLC | Harford County, MD | Dimension stone | 18 | 2 |
| Pinesburg Quarry | Martin Marietta Materials, Inc. | Washington County, MD | Crushed, broken limestone | 17 | 1 |
| Boonsboro Quarry | Martin Marietta Materials, Inc. | Washington County, MD | Crushed, broken limestone | 10 | 1 |
| Kpi-Jci 4250 | Scott's Hauling and Excavating | Washington County, MD | Crushed, broken limestone | 3 | 1 |
| Smith 301 Pitt | Renard Lakes Holdings, LLC | Prince Georges County, MD | Crushed, broken granite | 6 | 0 |
| Butler Artcraft Stone Corporation | Butler Artcraft Stone Corporation | Baltimore County, MD | Dimension stone | 1 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Crushed, broken limestone | 12 | 41.4% |
| Crushed, broken granite | 6 | 20.7% |
| Crushed, broken stone | 3 | 10.3% |
| Dimension stone | 2 | 6.9% |
| Cement | 2 | 6.9% |
| Dimension sandstone | 2 | 6.9% |
| Dimension granite | 1 | 3.4% |
| Crushed, broken traprock | 1 | 3.4% |
Citations and injury cases by year
Calendar years since 2022; 2026 runs to the date of the MSHA files.
| Year | Citations and orders | Significant and substantial | Proposed penalties | Injury and illness cases |
|---|---|---|---|---|
| 2022 | 123 | 19 | $52,873 | 12 |
| 2023 | 173 | 33 | $74,789 | 14 |
| 2024 | 115 | 14 | $59,920 | 16 |
| 2025 | 118 | 21 | $101,385 | 15 |
| 2026 | 124 | 15 | $27,393 | 14 |
Standards cited most at stone mines in Maryland
Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.
| Standard | What the part covers | Citations |
|---|---|---|
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 97 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 55 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 43 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 38 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 28 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 20 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 20 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 19 |
| 30 CFR 56.16005 | Surface metal and nonmetal mines | 19 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 18 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 16 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 14 |
| 30 CFR 47.41 | Hazard communication | 12 |
| 30 CFR 56.20011 | Surface metal and nonmetal mines | 11 |
| 30 CFR 56.14109 | Surface metal and nonmetal mines | 10 |
Injury and illness cases at stone mines in Maryland
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 50 |
| No lost time, or an occupational illness | 21 |
What the accident reports at stone mines in Maryland describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 34 |
| Handtools (nonpowered) | 16 |
| Slip or fall of person | 9 |
| Machinery | 5 |
| Powered haulage | 3 |
| Other | 3 |
| Disorders (physical agents) | 1 |
| Fire | 1 |
| Electrical | 1 |
| Striking or bumping | 1 |
Equipment named in accident reports at stone mines in Maryland
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 17 |
| Hand tools (powered) | 2 |
| Trucks | 2 |
| Shovel | 2 |
| Crane | 2 |
| Forklift | 1 |
| Welding machine | 1 |
| Elevator | 1 |
| Fan | 1 |
| Front-end loader | 1 |
Updated November 6, 2026. Read from US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets. US government work, public domain. Counts come from the MSHA files published on November 6, 2026. An open mine is one MSHA lists as Active, Intermittent, New Mine, Temporarily Idled or NonProducing; 13,673 were open that day. Citations, penalties, inspections and accident reports run from January 1, 2022. A citation is an inspector's allegation and an operator can contest it; the penalty is the amount MSHA first proposed, before any contest or settlement. An operator is the legal entity MSHA assesses, and a parent company is its controller. Mines run by sole proprietors or by individuals are counted in every total and are not named. This page uses MSHA data and is not endorsed or certified by MSHA. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.