Spoiler warn: there is absolutely no universal ‘best metal detector for gold’. (Even though the GPZ 7000 is near for those of you who will afford to pay for a detector that’s a similar price as a car). There are even techniques for receiving within the problems of Seashore mineralization, https://linuxline.org/blogs/125298/Gold-and-Relic-Hunting-Using-a-Metal-Detector