Assertion: asteroid belt's asteroid | /r/HasProperty | good source
Facets:
value: for indium
type: TRANSITIVE-OBJECT
value: for silver
type: TRANSITIVE-OBJECT
value: for gold
type: TRANSITIVE-OBJECT
value: for tin
type: PURPOSE
value: for lead
type: PURPOSE
value: for phosphorous
type: PURPOSE
value: for copper
type: TRANSITIVE-OBJECT
Source sentences:
text: Asteroids can be a good source for silver, phosphorous, tin, gold, lead, indium, and copper.