Arnau will take a fellow Almogaver with Second Sight and another with some accounting and social skills to check on the mine herself as well as a guide with local area lore.
Stats left to the potential player that wants to stat whoever of those you want (the guide probably already has a full write up). I am extremely lenient on that IMS and tend to play likewise in online places, stating them up as it fits the story, so if anyone wants to take charge of that do whatever you want with the character. Let's assume 26 years old, already a veteran light infantryman, and more than able to hold his wits in front of supernatural opponents. If no stats want to be generated, just take one of the dozens of almogavers that Marko has created for the saga and swap a few numbers around, or just the name.
Arnau will accept other people as well if they look interesting (that might simply mean that they are beautiful women), useful and/or highlight their status as capable landowners. I just want to be sure he has a guide and 2 capable fighters with him.
Light armor for everybody at most for this mission. He does not expect trouble, but a few javelins, side weapons, spears and shields will be available to them. they are guards, after all.
They will all ride horses or donkeys (for the ride-impaired people): He wants to demonstrate élan, after all. And he is a show off.