I conducted a hot rock test today i was out metaldetecting the gravle road in front of my house using my compadre and i found a nice hot rock that looked to be basalt and was magnetic about 3/4" x1" i also found a nice copper shellcasing whith no lead in it it was about as big as a penny so i did a comparison whith my musketeer now the compadre in all metal would pick up the hot rock to a depth of 2" whith a eratic sound but the musketeer was well nie silent but hear is whear i was really amazed if i put the copper bullet at 3" deep and the hot rock at 1.5" deep the compadre went silent but the minelab went right thru it i know im missing things whith the compadre du to hot rocks but not whith the minelab listen if you are new to metaldetecting and want a good metal detector get a minelab they are good metaldetecors