I usually use a pound of FFFF black powder, two feet of cannon fuse, and my 120 lb anvil. I pour the blackpowder down the hole, insert the fuze, bury the powder and end of the fuze, place the anvil over the hole, then light the fuze. I did this about four years ago. I have my first mole/gopher this year since then.
The only drawback is a large hole usually remains after the gopher leaves. Sometimes you have to be careful about the anvil coming out of the sky. It don't always happen, but sometimes it does. /forums/images/graemlins/laugh.gif