Hi Matthias, Don't give up just yet on detecting the old dump.Several years ago a buddy of mine and I detected an old dump on the Gulf Coast and it was not only very interesting, it was certainly worth the effort.Don't remember finding any coins, but I did find several discarded silver items. One particular find was a "larger than" palmsized sterling silver, lady's compact. I am pretty sure that dump was loaded with much debris from past hurricane cleanup. You have to consider that cleanup from fires,floods, storms etc. will often end up in the dump, so not everything in a dump will have been discarded because it was worthless and no longer of use. I once salvaged a bunch of goodies from a house fire site with my detector and a potato rake.The site was later scraped off and haulded to the dump.You would be surprised at how well some items can survive a housefire.Some of the coins were fused together and some only needed a cleanup.Use a small coil, crank up the disc. and see what turns up. I bet you will be surprised. HH, Charlie