The ESO antiquities leads drop from specific zones and sometimes from very specific monsters or bosses. Each antiquity page will indicate in what zone it drops and what monster or boss that you have to kill. Antiquity leads can drop even if you don’t have access to Greymoor. However, you won’t be able to use them. because you will need to have the scrying and excavation skill-line to access the leads. You can learn more about how to start the Antiquities quest line in the Antiquities Overview guide. Leads can have different difficulty levels, therefore you need a certain level to be able to activate gold leads.