{"thcode":2,"term":{"code":775,"name":"natural resource extraction","parent":1174,"scope":"Removal of natural materials or properties (such as heat) for use."},"uf":[{"name":"resource extraction","usewith":false}],"bt":[{"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":[{"code":2021,"name":"enhanced oil recovery","parent":775,"scope":"Injection of steam, gas, or other chemical compounds into hydrocarbon reservoirs to stimulate the production of usable oil beyond what is possible through natural pressure, water injection, and pumping at the wellhead."},{"code":2034,"name":"hydraulic fracturing","parent":775,"scope":"Injection of water and other fluids through a well into geologic formations in order to increase the permeability of the rock units and thus permit natural gas or oil to be produced from them."},{"code":749,"name":"mining and quarrying","parent":775,"scope":"Extracting mineral deposits from a pit, tunnel, or excavation."},{"code":1373,"name":"placer deposit mining","parent":775,"scope":"Extraction of minerals, typically metal ores, from unconsolidated surficial materials such as stream sediments."},{"code":1325,"name":"well drilling","parent":775,"scope":"The process of artificial excavation for the purpose of withdrawing water, oil, or gas from underground."}],"rt":[{"code":2047,"name":"beach nourishment","parent":776,"scope":"Transfer of sand from offshore areas to resupply beach areas that have been eroded."}]}