{"thcode":2,"term":{"code":1724,"name":"mine drainage","parent":1723,"scope":"Introduction of harmful substances into the environment from mines and tailings."},"uf":[],"bt":[{"code":1723,"name":"industrial pollution","parent":769,"scope":"Introduction of harmful substances into the environment by manufacturing, power generation, mining, or material processing."},{"code":769,"name":"contamination and pollution","parent":1174,"scope":"Introduction of harmful substances into the environment by human action or natural processes."},{"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":[{"code":2276,"name":"acid neutralizing potential","parent":1367,"scope":"Geochemical capacity of earth materials to affect the pH of waters flowing through them."},{"code":2275,"name":"acid-base accounting","parent":189,"scope":"An analytical procedure that provides values to help assess the acid-producing and acid-neutralizing potential of overburden rocks prior to coal mining and other large-scale excavations."},{"code":750,"name":"mining hazards","parent":548,"scope":"Dangerous conditions which result from the extraction of naturally occurring mineral deposits.  Includes tunnel collapses, fires, and explosions."}]}