Indeed, the latest finding I am aware of is an intricate gear-train – that is, a device on which gears travel – made of pure aluminium, found embedded and fossilised in a piece of coal 310 million years old. But, up to the early 1800s, no-one could ostensibly smelt bauxite (aluminium ore): it was only made possible by electrolysis; i.e. only after the discovery of electricity.
The gear-train was discovered by a Vladivostok, Russia resident in 2013. He took it for scientific examination…but, in typical fashion, no convention was held to discuss what ought to be yet another game-changing discovery. Ask any professor of archaeology or history.