I spent most of my life farming in NE Iowa. Dad had a sawmill as a 2nd occupation. It uses a 48" diameter circular blade. Long before this type of band saws were used. Belt driven by a John Deere 820 tractor. People would bring logs & we sawed them & charged according to what the log "squared at" & the length. Piled the slabs on a row. let them dry a year & start another row. Cut from the year old row & sold as firewood.
The blade had round "tooth holders". First the disposable teeth were sharpened with a hand file, later with an electrical grinder, the forerunner of the Dremel.
The worst logs were cut from in peoples yards. We hit nails, hammock holders, horseshoes, rifle shells, etc. The bigger things ruined every tooth.
Working around a mill was darn hard work. Dad enjoyed it & I think that a big reason for doing it, was to keep my brother & I tired & our eyes burning from sawdust. At the end of the day, we had NO DEISIRE to go out raising heck or courting the Ladies at night.
Dad split the income 3 ways, between himself & my brother. That was our spending money.