DuckCorp Dico

Found one definition

1.                 From en.wiktionary.org:
                   
   
   
                   
                     
   [blackball]
   
   ** English
   
   
   *** Proper noun
   [en-prop]
   
    1. [en] , with a history of gold and coal mining.
   *** References
   
    - NZ Topo Map (see https://www.topomap.co.nz/NZTopoMap/nz39726/Blackball/)
   *** Further reading
   [Blackball#Other]