Coin 9 has been found near-ish Las Vegas, NV in the Humboldt-Toiyabe National Forest by Nadine S. Congrats!
The list of possible coin locations has been updated.
NOTE: Others that have been found were not ready to have their clues published but this one did. As an example of where one of these was from the clues to the final location, here are the clues and drawing.
An ancient word that means “Mountain”
Near a major city
Half way to a place of recreation in the winter
In Earth: BTY113.31@60