How concentrated would a metal ore need to be to be extractable by a suitable plant?

So there is a Minecraft mod that includes various oreberry bushes. One for gold, one for silver, etc. Now I know that various plants can extract specific minerals in higher quantities that what would normally be expected, so my question revolves around concentrations in the environment. If I wanted a plant that extracted, say gold, from the environment and produce pea-sized nodules of pure gold how concentrated would the gold have to be to have a bush actually do this? I think it would be interesting to have a bush that a harvest gave a couple dozen of these little balls of pure metal instead of normal fruits. I know that this might make propagation of the bush difficult, so maybe in addition to the ore, the plant also produces something like hollow seed pods and to keep refreshing the minerals maybe the plant lives in or near an area of frequent volcanic activity...

posted over 9 years ago

Brad‭

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