Magnetite-(apatite) (MtAp) mineralization, also referred to as Kiruna-type (Geijer1931), or iron oxide apatite (IOA), are massive low-Ti (< 1 wt.% Ti) magnetite ores with variable amounts of apatite, actinolite or clinopyroxene (dominantly diopside), scapolite, and anhydrite (Badham and...