Mica Mine Ruins

Mica Mine Ruins (HM23C2)

Location: Silver Spring, MD 20902 Montgomery County
Country: United States of America

N 39° 3.704', W 77° 1.565'

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The mine was located in a wooded area on the western bank of the Northwest Branch, which is now adjacent to the Springbrook Forest subdivision.

Mica is a silver-colored, heat resistant rock that can be split into thin transparent sheets. In the late 19th and early 20th centuries, mica was used to make windows in cast-iron heating stoves. Mica was also used for lamp shades, electrical equipment, and cosmetics.

When workable quantities of mica were found here, the Gilmore Mica Mines began operations at this site in 1882. The mine, with a 50-foot vertical shaft, ceased operation in the 1920s, and had largely disappeared by the time the subdivision was built. Look closely at the ground, however, and you might still be able to see traces of shiny mica rock.

"Drink in the beauty ... and wonder at the meaning of what you see." — Rachel Carson, The Sense of Wonder (posthumously 1965)
HM NumberHM23C2
Placed ByMontgomery Parks
Marker ConditionNo reports yet
Date Added Thursday, November 30th, 2017 at 7:02am PST -08:00
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Locationbig map
UTM (WGS84 Datum)18S E 324702 N 4325580
Decimal Degrees39.06173333, -77.02608333
Degrees and Decimal MinutesN 39° 3.704', W 77° 1.565'
Degrees, Minutes and Seconds39° 3' 42.24" N, 77° 1' 33.9" W
Driving DirectionsGoogle Maps
Area Code(s)301, 240, 410
Which side of the road?Marker is on the right when traveling North
Closest Postal AddressAt or near Northwest Branch Trail, Silver Spring MD 20902, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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