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Greenstone Quarry, GAF Ruberoid Mill, Blue Ridge Summit, Adams Co., Pennsylvania, USA
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Greenstone Quarry, GAF Ruberoid Mill, Blue Ridge Summit, Adams Co., Pennsylvania, USA

Photo: M.Heintzelman
Latitude: 39°44'50"N
Longitude: 77°27'19"W
In 1923 the Funkhouser Company of Hagerstown acquired the operation and started to supply natural greenstone for roofing shingles. The Ruberoid Corp acquired the plant in 1959 and GAF Corp assumed control in 1967.

Native copper occurs in quartz veins and epidote-rhyolite host rock. Secondary copper mineralization is present. Epidote-rhyolite is quarried for use as an aggregate in the production of roofing shingles. The operation currently includes 625 acres housing quarries, mills and color processing units.

Mineral List


6 entries listed. 6 valid minerals.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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