Definition of Ball stamp in English:

Ball stamp

Pronunciation /ˌbɔːl ˈstamp/

noun

(also Ball's stamp)
historical
  • A stamp mill utilizing a steam hammer, formerly used in the United States for crushing ore.

Origin

Mid 19th century; earliest use found in Mining Magazine & Journal Geology. In some forms from the genitive of the name of W. Ball, the inventor + stamp.