| gptkbp:instanceOf | gptkb:cryptocurrency 
 | 
                        
                            
                                | gptkbp:abandoned | yes 
 | 
                        
                            
                                | gptkbp:activePeriod | early 20th century 
 | 
                        
                            
                                | gptkbp:alsoKnownAs | Tri-State mining district 
 | 
                        
                            
                                | gptkbp:centeredIn | gptkb:Picher,_Oklahoma 
 | 
                        
                            
                                | gptkbp:declinedAfter | 1960s 
 | 
                        
                            
                                | gptkbp:environmentalImpact | lead contamination chat piles
 
 | 
                        
                            
                                | gptkbp:EPAInvolvement | gptkb:Tar_Creek_Superfund_site 
 | 
                        
                            
                                | gptkbp:hasResource | gptkb:lead copper
 iron
 silver
 zinc
 cadmium
 
 | 
                        
                            
                                | gptkbp:historicalSignificance | major source of lead for World War I and II 
 | 
                        
                            
                                | gptkbp:locatedIn | gptkb:United_States gptkb:Ottawa_County,_Oklahoma
 
 | 
                        
                            
                                | gptkbp:majorCity | gptkb:Cardin gptkb:Picher
 Commerce
 
 | 
                        
                            
                                | gptkbp:miningEnded | 1967 
 | 
                        
                            
                                | gptkbp:miningStarted | 1900s 
 | 
                        
                            
                                | gptkbp:namedAfter | gptkb:Picher,_Oklahoma 
 | 
                        
                            
                                | gptkbp:notableFor | lead and zinc mining 
 | 
                        
                            
                                | gptkbp:partOf | Tri-State mining district 
 | 
                        
                            
                                | gptkbp:populationDecline | yes 
 | 
                        
                            
                                | gptkbp:significantEvent | evacuation due to contamination 
 | 
                        
                            
                                | gptkbp:SuperfundSite | yes 
 | 
                        
                            
                                | gptkbp:bfsParent | gptkb:Tar_Creek_Superfund_cleanup 
 | 
                        
                            
                                | gptkbp:bfsLayer | 8 
 | 
                        
                            
                                | https://www.w3.org/2000/01/rdf-schema#label | Picher mining district 
 |