We have gotten permission to go over some land that once had a one room school around 1900. Also an old store from the same time period. The old store is still there but the old schoolhouse was taken down for the lumber approx 1935. It has been farmed for 80 years. It is clay soil & rocky. How deep might coins or relics be after 100 years? I doubt the children had much money unless it was pennies. I have the silver umax & unfortunately don't have any other coils yet. From what I have read it sounds like a larger than standard coil would go deeper but hopefully we will find some treasures. The store was owned by my husbands maternal great grandfather it would really mean alot to us to find some treasures. His mother attended the school for at least one year until a new school was built. This is our first hunt on old family property. Thanks for any tips Cathy in NC