Assertion: metal's ore | /r/HasProperty | heated with reducing agent
Facets:
value: to extract the pure metal
type: PURPOSE
Source sentences:
text: When a metal ore is an ionic compound of that metal and a non-metal, the ore must usually be smelted—heated with a reducing agent—to extract the pure metal.
text: When a metal ore is an ionic compound of that metal and a non-metal, the ore must usually be smelted—heated with a reducing agent—to extract the pure metal.