I have been hunting a gravle barr, and it is full of all kinds of rocks from mild granite to limestone to the more mineralized granites and lots of Basalt of all nasty kinds, and i think the basalt makes up over 50% I have been leaving the bliss behind, ---For the folowing reasons, that really badd rock i found well the bliss can get a dime under it even in disq, but i have to be within 1" of the stone , or it will not sound off, then I found a worse rock, and the bliss was not up to my standards, barly making a diggable sound , it just does not do as well because of the uneven teraine so I have been using the Gold bug with the 5" coil and getting good results in all metal , I ground balance at 89 on a hot rock and start searching some rocks sound off because they have less minerals but I have been ok with that , but i am able to get thru the badd stuff better and am pulling out some stuff , I did a test on the badd rock and the gold bug got the target thru the mineralized stone far beter and deeper , so I have been using the all metal , I would love to try a whites TDI on this gravle as it is full of basalt but the Gold bug has been doing well , I keep wanting to sell the Bug but just have not figured I should do that .