#placer_mining  mining valuable minerals from a placer by washing or dredging
  supertype:  #mining__excavation  the act of extracting ores or coal etc from the earth
     supertype:  #production  (economics) manufacturing or mining or growing something (usually in large quantities) for sale; "he introduced more efficient methods of production"
        supertype:  #industry.business_enterprise__manufacture  the organized action of making of goods and services for sale; "American industry is making increased use of computers to control production"
           supertype:  #business_enterprise__commercial_enterprise__business  the activity of providing goods and services involving financial and commercial and industrial aspects; "computers are now widely used in business"
              supertype:  #commercialism__commerce__mercantilism  transactions having the objective of supplying commodities
                 supertype:  #transaction__dealing__dealings  the act of transacting within or between groups (as carrying on commercial activities); "no transactions are possible without him"; "he has always been honest is his dealings with me"
                    supertype:  #group_action__groupaction  action taken by a group of people
                       supertype:  #human_action__humanaction__act__human_activity__humanactivity  something that people do or cause to happen
                          supertype:  pm#process__proces  situation commonly considered as making a change during some period of time
                             supertype:  pm#situation  something that "occurs" in a real/imaginary region of time and space
                                supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                             supertype:  pm#process_or_process_description
                                supertype:  pm#processing_thing
                                   supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                                      supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                          supertype:  sumo#process__proces__physicalsituation  intuitively, the class of things that happen and have temporal parts or stages; examples include extended events like a football match or a race, actions like pursuing and reading, and biological processes; sumo#process is not identical to pm#situation because an instance of pm#situation is not necessarily an instance of sumo#physical
                             supertype:  pm#situation  something that "occurs" in a real/imaginary region of time and space
                             supertype:  pm#process_or_process_description
                             supertype:  sumo#physical__physical_thing  an entity that has a location in space-time; locations are themselves understood to have a location in space-time; click here for more details on the identical category sowa#physical_thing
                                supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

No statement uses or specializes #placer_mining; click here to add one.