Normally, a quicker sweep will find more substantial, deeper gold targets, but will are likely to miss out on modest shallow gold. A slower sweep will have a tendency to get rid of sensitivity to the deepest targets, but will discover compact shallow gold a lot easier. Minelab’s GPX 6000 https://linuxline.org/blogs/125298/Gold-and-Relic-Hunting-Using-a-Metal-Detector