Assertion: antimony | /r/AtLocation | trace amounts
Facets:
value: in copper
type: LOCATION
value: in lead
type: OTHER
value: in silver
type: LOCATION
Source sentences:
text: Antimony is found in trace amounts in silver, copper and lead ores, and it is usually economically possible, as well as environmentally desirable, to extract the antimony from these ores when they are smelted.
text: Antimony is found in trace quantities in nature but is chiefly obtained from mineral ores such as valentinite (Sb2O3) and stibnite (Sb2S3).
text: Antimony has been found in trace amounts in ancient copper and lead alloys.