Alluvial rich area sitting above the Pegmatite corridorSome guys here do not have any clue about geology. You do not need to drill holes into alluvium. Everything you need is on the surface.
Alluvium is "An unconsolidated accumulation of stream-deposited sediments, including sands, silts, clays, or gravels"
How do you drill holes into an unconsolidated accumulation?