{"thcode":2,"term":{"code":1373,"name":"placer deposit mining","parent":775,"scope":"Extraction of minerals, typically metal ores, from unconsolidated surficial materials such as stream sediments."},"uf":[],"bt":[{"code":775,"name":"natural resource extraction","parent":1174,"scope":"Removal of natural materials or properties (such as heat) for use."},{"code":1174,"name":"topics","parent":1,"scope":"Themes, subjects, and concerns for which USGS information resources are relevant."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[],"rt":[]}