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MSHA mine register by county

Mines in St. Mary's County, Maryland

St. Mary's County, Maryland has 7 mines on MSHA's register: 2 active, 1 intermittent, 4 abandoned. 59 accidents have been reported at these mines between 1985 and 2025. Inspectors have issued 292 citations.

Every mine MSHA has registered in St. Mary's 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 St. Mary's County →

Mines on register
7
Active
2
Fatalities on record
0
Citations issued
292
0 underground · 7 surface · 0 facilities 0 coal · 7 metal and non-metal 1 intermittent 4 abandoned 59 reported accidents, 1985–2025
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.
St. Mary's County, Maryland · Population 114,372
0.1%
Mining share of county employment
$114,580
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
Chaney Enterprises LTD Partnership 2 0 0
Sustainable Land Use, LLC 2 1 0
Base Company Inc 1 0 0
Sloan Materials, LLC 1 1 0
Vulcan Construction Materials, LP 1 0 0
Mines in St. Mary's County7 on register
  1. Mechanicsville-MD Sand & Gravel
    Surface metal/non-metal · Sustainable Land Use, LLC · MSHA ID 1800574
    Active
  2. ZIMMERMAN MINE
    Surface metal/non-metal · Sloan Materials, LLC · MSHA ID 1800739
    Active
  3. Leonardtown Sand & Gravel
    Surface metal/non-metal · Vulcan Construction Materials, LP · MSHA ID 1800572
    Abandoned
  4. Chaney Enterprises
    Surface metal/non-metal · Chaney Enterprises LTD Partnership · MSHA ID 1800737
    Abandoned
  5. Loveville-MD Sand & Gravel
    Surface metal/non-metal · Sustainable Land Use, LLC · MSHA ID 1800736
    Intermittent
  6. Base Company Incorporated
    Surface metal/non-metal · Base Company Inc · MSHA ID 1800640
    Abandoned
  7. LEONARDTOWN SAND & GRAVEL CO.
    Surface metal/non-metal · Chaney Enterprises Lp · MSHA ID 1800316
    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.