Claudio sent us a link about cutting millstones from a quarry before machines. A
provincial park near Nanaimo, BC, Canada includes the remnants of a quarry used
for extracting millstones and even sandstone columns. Steam-powered machines
were used, but I still found it interesting to explore the quarry in person.
Using your favorite search engine, do a search for "images Newcastle Island
quarry" if you are interested.
The millstones from this quarry were mostly used in pulp mills and transported
More photos can be found here:
north of Seattle USA