Today, concrete foundation piers from a placer chromite processing plant are visible beside Black Run. The plant was built during World War I for the recovery of placer chromite, probably for munitions.
Serpentine, a geological outcrop of rare, light-green rock found only in three small geographic areas in all of North America, has soil so low in essential nutrients and so high in some metals that most ordinary plants will not grow. The barrens have their own community of plants, some of them globally-rare, with practically no species in common with the surrounding forests and fields.
Typically, serpentine barrens contain scrub oak, pine, cedar and unique wildflowers. Some areas dominated by grasses are known as true prairies. Some areas with scattered trees are known as a savannah, which can survive and prosper with occasional fires.