The material Gold is used to get your melee weapon to a high-level upgraded and Gold is on of the rarest material in Ghost of Tsushima. Any Swordsmith can either upgrade your Sakai Tanto or your Sakai Katana. It will require some Gold at the last few upgrades.
An overview of all trophies can be found here. Back to Ghost of Tsushima – Overview for Collectibles, Armor, Weapons, Resources.
Here is a Overview for how to get Gold:
- Gold can be bought from Trappers in exchange for Supplies, so as many times mentioned, make sure to gather all Supplies crossing your way.
- Liberating enemy Strongholds give you a fixed amount of 2 Gold, you can see it on your map by looking up for the red building icons. This counts not for Enemy Farms (red wheat icons) or small Outposts (red dots).