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MSHA mine register by county

Mines in Montgomery County, Maryland

Montgomery County, Maryland has 6 mines on MSHA's register: 2 active, 4 abandoned. 156 accidents have been reported at these mines between 1983 and 2023. Inspectors have issued 546 citations.

Every mine MSHA has registered in Montgomery County, working or not, with the accident, fatality and citation record each one carries on this site. Active mines are listed first, then the rest by the weight of their record.

Abandoned and historical mine features in Montgomery County →

Mines on register
6
Active
2
Fatalities on record
0
Citations issued
546
0 underground · 5 surface · 1 facilities 0 coal · 6 metal and non-metal 4 abandoned 156 reported accidents, 1983–2023
Local economic context
ⓘ County figures come from the US Census Bureau's American Community Survey, 5-year pooled estimates, so the 2023 vintage covers 2019 through 2023. The Census category is 'mining, quarrying, and oil and gas extraction', which is broader than MSHA jurisdiction and includes oil and gas workers no mine employs. These figures describe the surrounding county, not this mine, and are not a factor in any specific incident.
Montgomery County, Maryland · Population 1,057,586
0.0%
Mining share of county employment
$128,733
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.
On the map 
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MSHA-registered mine, any status

Mines plot only where MSHA holds a surveyed coordinate for the site; mines the agency locates to a town, county or state centroid are in the counts and the list above but not drawn. Click a point for the mine's status and record.

Operators with the most mines herecurrent operator of record
Operator Mines Active Fatalities
Amrize Mid-Atlantic Inc. 1 1 0
B Giancola Stone Quarry 1 0 0
Contee Sand & Gravel Company Inc 1 0 0
H B Mellott Estate Inc 1 0 0
Stoneyhurst Quarries Inc 1 0 0
Tri-State Stone & Building Supply Inc. 1 1 0
Mines in Montgomery County6 on register
  1. Amrize Rockville Quarry
    Surface metal/non-metal · Amrize Mid-Atlantic Inc. · MSHA ID 1800029
    Active
  2. Carderock Quarries
    Surface metal/non-metal · Tri-State Stone & Building Supply Inc. · MSHA ID 1800404
    Active
  3. Stoneyhurst Quarries, Inc.
    Surface metal/non-metal · Stoneyhurst Quarries Inc · MSHA ID 1800032
    Abandoned
  4. B GIANCOLA QUARRY
    Surface metal/non-metal · B Giancola Stone Quarry · MSHA ID 1800562
    Abandoned
  5. Mcceney Pit And Plant
    Surface metal/non-metal · Contee Sand & Gravel Company Inc · MSHA ID 1800421
    Abandoned
  6. Rockville Plant
    Facility metal/non-metal · H B Mellott Estate Inc · MSHA ID 1800636
    Abandoned

Status, type and operator are as reported to MSHA. Fatality and accident counts are MSHA's reportable accident records for the mine; citations are inspector-issued violations on record. Each mine's own page carries the full detail.

Other counties in MarylandAll counties →
How to read these numbers

The register is MSHA's Mine Data Retrieval System: every operation ever assigned a mine ID, including ones abandoned decades ago, so the count is a history of mining in the county, not a count of working mines. A mine's county is the one its operator reported to MSHA. Fatality and accident counts start with MSHA's reportable-accident records (1983 onward); citation counts are inspector-issued violations on record. We are an independent research tool, not MSHA.