We have a piece of slate (5' x 4' x 4'') on top of our [b]water well [/b]which has unfortunately broken into three pieces. I intend to rebuild the top part of the well surround (sandstone) to reseat this slate. I have removed the slate pieces and want to know what type of morter would be best to use on sandstone blocks [I will be increasing the above ground part of the well from ~6'' to 18''].
Also would it be possible to repair the piece of slate. I was thinking of drilling holes and using stainless pins with a suitable epoxy??