One of the mysteries of the English language finally explained.
A stamp mill utilizing a steam hammer, formerly used in the United States for crushing ore.
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. In some forms from the name of W. Ball + stamp.
Ball stamp/ˌbɔːl ˈstamp/
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