Assertion: dickinson county lignite | /r/HasProperty | mined to limited extent
Facets:
value: from seams
type: LOCATION
Source sentences:
text: The Mitchell County lignite was known and mined to a limited extent as early as 1875 (Gray, 1875, p. 34) from seams reported to have been from 15 to 30 inches thick although later reports gave the coal a thickness of 12 to 14 inches.