The metal from the rock in the Falcon Lake incident was a piece of scrap metal that was already on the rock when the alleged craft landed on it, and partially melted it into some cracks in the rock.
The scrap metal was definitely human scrap metal, nothing special. But it was partially melted into the rock and irradiated.
I also find it intriguing that the Falcon Lake craft was apparently very hot, whereas we have modern thermal readings indicating modern UAP are very cold. The UAP of the Nimitz Event is one such example.
I've assumed that it didn't get renewed seeing as how there hasn't been another season. such a shame.. Honestly surprised it wasn't more popular.