Assertion: anthracite | /r/HasProperty | mined in a 480-square-mile area
Facets:
value: historically
type: TEMPORAL
value: in the northeastern region of pennsylvania
type: LOCATION
Source sentences:
text: Historically, anthracite was mined in a 480-square-mile area in the northeastern region of Pennsylvania, primarily in Lackawanna, Luzerne, and Schuylkill counties.