Is it possible to mine your coins?
Unfortunately, PLEX tokens cannot be mined. They can only be minted during the Pre-ICO and ICO.
Is this a security token or a utility token?
It's a utility token
Will the marketplace show the products cost in USD/ GBP or Plex tokens? Sorry if this has been asked earlier.
Looking at their MVP, the prices are quoted in USD. Now I do not now whether it will be local currencies for other countries, but definitely not in plex i guess.
PLEX will be one of the currencies on the marketplace that users can display prices in and purchase goods or services with.