Maryland MinePast Producer • Gold
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Unnamed Schist Quarry Near Cabin John ParkPast Producer • Stone, Dimension
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Bethesda MinePast Producer • Gold
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Harrison MinePast Producer • Gold
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Sawyer MinePast Producer • Gold
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Irma MinePast Producer • Gold
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Lynch MinePast Producer • Gold
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Rock Run Gold PlacersOccurrence • Gold
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Tri-State Stone Company QuarryProducer • Stone, Dimension
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Stoneyhurst Quarry Number 3Producer • Stone, Dimension
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Rockville Crushed Stone Co. QuarryProducer • Stone, Crushed/Broken
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Mcceney Pit and PlantPast Producer • Sand and Gravel, Construction
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Sawyer Mine & 5 Additional MinesPast Producer • Gold
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Bethesda MinePast Producer • Gold
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Huddleston MinePast Producer • Gold
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Bogley MinePast Producer • Gold
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Montgomery MinePast Producer • Gold
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Stonyhurst QuarriesPast Producer • Stone
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Unnamed, Near BrookvillePast Producer • Manganese
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Etchison Mine & Lyde Griffith PropertyPast Producer • Chromium
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Stoneyhurst Quarry Number 1Producer • Stone, Dimension
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Toms Run QuarryProducer • Silica
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B. Giancola QuarryProducer • Stone, Crushed/Broken
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Unnamed Schist QuarryPast Producer • Stone, Dimension
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Lynch MinePast Producer • Gold
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Eagle MinePast Producer • Gold
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Miller MinePast Producer • Gold
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Bogley MinePast Producer • Gold
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Harrison MinePast Producer • Gold
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Earth Products Company QuarriesPast Producer • Feldspar
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Ellicott MinePast Producer • Gold
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Sawyer MinePast Producer • Gold
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Tri-State Stone Co. QuarryProducer • Stone, Dimension
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Rock Run Gold PlacersPast Producer • Gold
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Toms Run QuarryPast Producer • Stone, Dimension
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Stoneyhurst Quarry Number 1Past Producer • Stone, Dimension
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Watson MinePast Producer • Gold
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Maryland MinePast Producer • Gold
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Huddleston MinePast Producer • Gold
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B Giancola QuarryProducer • Mica
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Stonyhurst QuarriesProducer • Stone
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Etchison MinePast Producer •
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Gilmore MinePast Producer • Mica
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Brookville MinePast Producer • Manganese
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Rockville Crushed StoneProducer • Stone, Crushed/Broken
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Rockville PlantPast Producer • Stone, Crushed/Broken
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Montgomery MinePast Producer • Gold
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Ford MinePast Producer • Gold
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Stoneyhurst Quarry Number 3Past Producer • Stone, Dimension
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Mcceney PitPast Producer • Sand and Gravel, Construction
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Earth Products Company MinesPast Producer • Feldspar
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Griffith MinePast Producer •
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Bethesda MinePast Producer • Gold
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