Assertion: gypsum | /r/HasProperty | mined near the level of blue river
Facets:
value: from the outcrop
type: LOCATION
value: on the town's original grant
type: LOCATION
Source sentences:
text: Gypsum was mined from the outcrop near the level of Blue River on the town's original grant, and the rock was shipped down the river on barges to a one-kettle mill just south and west of the dam at Blue Rapids.