Assertion: boulder opal | /r/HasProperty | discovered in the town of blackall
Facets:
value: in the middle of queensland
type: LOCATION
value: australia
type: LOCATION
Source sentences:
text: While general Opals have been mined for thousands of years, Boulder Opals were only discovered in 1869 in the town of Blackall in the middle of Queensland, Australia although some claim Boulder Opals were first found in 1849 in Tarravilla.