To be honest, this is the first time I am hearing about this particular coin, but I think the one way to be able to convert this to fiat is to download a trust wallet application, from there, you can change it to a cryptocurrency that you will be able to sell easily, e.g, Bitcoin, ethereum, litecoin and the likes. Well I am not guaranteeing you that this would work though, because the only it could work if the minereum coin is on the app, if it is not on there, it could probably be because it is not yet launched or not popular enough yet to be widely accepted.