Although , once a thriving , profitable businesses , there are no longer any active quarries operating in the Amberg area .
However , in 1929 , 500 - 600 cars of this stone was sold to the Universal Granite Company of Milwaukee to be used as breakwater stone .
Once a thriving , profitable businesses , there are no longer any active quarries operating in the Amberg area .
However , in 1929 , 500 - 600 cars of this stone was sold to the Universal Granite Company of Milwaukee to be used as breakwater stone .