When you Find a Cabin in the Mountains with a golem nearby, there is usualy always a burried vein or 2 in the area.
There is also RNG factors that somtimes prop the Silver above ground, but the stag hammer trick can help find nodes Closer to the top.
Tediousness of blind digging is also RNG based on the actual spot silver is, though using a Mountain Cabins, as the area can cut down alot of blind digging.