Red, you are right if it is a cylinder 3 feet radius and 3 feet height. 47 yards. You're cylinder guess was as legitimate as my cone or square but it looks like it is 6 foot squares since 60 yards was mentioned. That's a lot of dirt. 4 yards per tree. Oh my back hurts just thinking about it.
I've got six jars of blackberry jelly cooling and the dishes washed. From licking the pot it looks like it will set up really well.
My son and I spread 24 yards of mulch on a clients beds one summer.
Thank God for a strong healthy kid. He wheelbarrowed it and I spread.
We thought we'd never see the end of that mountain of mulch.
I don't offer that service anymore. I rarely have the pleasure of my boys company and muscles on a job these days, and I'm just getting too old to work like that anymore.
NYboy, I hope you can round up some strong young men to help you with your project!