yeah I got that. But since you said that gold spawns in sharp localized spikes far apart distribution wise and the prospecting pick interpolates data from bordering chunks, getting any reading at all on density search for gold should mean that the chunk near the sample taken is one of those localized spikes. Because if what you say is true and that gold "veins" are small only one or two chunks at most with a lot of empty space in between to form lots of tiny individual spikes on the heat maps the game uses for ore distribution, that means you do not really get percentages guiding towards a high concentration area like copper for example with "veins" hundreds of chunks wide with probability of up to 30% in the center of the heat map peak. You cant get those percentage readings because there are no high percentage areas so to speak. A reading for gold on density search is more like a boolean answer of "true, you are on a node" as soon as you get any. Or you get "false, you are in the empty space between nodes" when you are between the nodes. The nodes are never close enough to get you any readings like the gradients of poor, decent etc or the percentages. Because the nodes are too far apart for any interpolation but as soon as you are directly on one, there would be enough of it to give you a poor reading. Which I got on two locations.
Finding most ores with the prospecting pic is like walking barefoot in the dark on a carpet trying to find a puddle in the room. You can actually feel the carpet getting from humid to moist to wet and at some point you step into the puddle.
Finding gold if what you say is true, is like walking the same room barefoot in the dark only that you dont look for a puddle. Its a bunch of single lego pieces spread around couple of meters apart. You wont feel anything most of the time. But once you find a "reading" by stepping on it. You should be pretty certain its there.