Hi Jim,
In every fiction have some truth. During earthquake or underground explosions ,more of soils or objects with piezo-electric property generate very strong electro-static impulse. This is known and usable in geological investigation. But make sparks by little variability of temperature of subsurface layers - it is too bold guess. Maybe this will have effect in desert rocks , where temp variations are from -10 to +80C.
It is interesting to check this idea in experiments.
But I can't see where is Au or another metals in this effect?
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