Gilberton is named for John Gilbert, a coal mine owner.

Entity and relation annotations:
id: 0
type: entity
value: text: Gilberton
labels: <Location>
id: 1
type: entity
value: text: John Gilbert
labels: <Person>
id: 2
type: entity
value: text: coal mine owner
labels: <Title>
type: relation
to_id: 2
labels: Person:holds_title:Title
from_id: 1