Just one metal involved? No.

Hidden text

In a nerdy linguistic way, I find it interesting that the phrase 'the metal', which showed up in four questions, spanned meanings that I reasonably interpreted as potentially including multiple metals (elemental, metaphorical), to a meaning that definitely required a single metal (ending in -um). 'Is the metal copper?' kinda sits in the middle; I perhaps should have suggested assumption checking at that point. As you were.

West of Prague? Yes.

Hidden text

Of course, it's also East of Prague, if you go far enough.

Mount or mountain in the name? There are in fact two acceptable answers on the card. The answer is Yes for one and No for the other. *a little muttering from some of the more literal-minded audience members*
Named on Google Maps? Yes. (Both answers on the card appear on Google Maps.)
Butter Mountain? No. (Interestingly, the second one of those would clearly have been only a marginal Yes in response to Tuj's last question.)

(This one is proving harder than I expected. I hope I haven't been misleading with any of my answers.)