This information suggests that traditional smelting came to an end around the turn of the 19th early 20th century, particularly in the last section. I would expect new tools also became available. Fascinating, wish I could get of hold of these videos. I think I have been a lucky chap.
http://homepages.ucalgary.ca/~ndavid...age/video.html
I have sent an email to ask about getting copies and maybe in DVD form.