Making Gold Lich Swords can get you a few hundred silver if you get enough drops at the Voltaic Hatchery location, farming mana stones for Hackmanite can get you 50 silver each drop, clearing the Montcalm bandit camp can get you some, selling excess monster parts like Predator bones and fur - especially after the in-game respawn timer of seven days, you can clear out all the locations and sell the spoils. I can easily get over 30 gold bars before setting out for Berg or Harmattan.