code:

immediate = {
        closest_system = {
                limit = {
                        has_access_fleet = root.owner
                        NOR = {
                                is_same_value = root.solar_system
                                has_star_flag = first_zoroni_site @root.owner
                                is_same_value = root.owner.capital_scope.solar_system
                        }
                        OR = {
                                has_owner = no
                                owner = { is_same_value = root.owner }
                        }
                        any_system_planet = {
                                habitable_planet = yes
                                is_colony = no
                                has_anomaly = no
                                NOT = { exists = archaeological_site }
                        }
                }
                min_steps = 1
                max_steps = 10
                random_system_planet = {
                        limit = {
                                habitable_planet = yes
                                has_anomaly = no
                                is_colony = no
                                NOT = { exists = archaeological_site }
                        }
                        create_archaeological_site = zroni_digsite_3
                        add_deposit = d_zro_deposit_3
                }
        }
}