I also searched for info. on sawmills in Montgomery Co., Ark, as an ancestor died in a sawmill accident. I would suggest seeing what sites Cyndi's List has for the topic, as there is a site specifically dealing with sawmills in Arkansas. Sorry I can't provide the address here.
Also, I found the information I was looking for in a compilation of newspaper clippings produced by the county historical society. As a fundraiser for the historical society, the members diligently transcribed the newspapers in their archives. It was worth the price because I found more than three references to the family I was researching, as well as detailed information on the death of the young ancestor. Good luck.