Only five actinides exist naturally which are Thorium, Protoactinium, Uranium, Neptunium and Plutonium while the other actinides are man made which are prepared by nuclear reactors.
Thorium and Uranium are only actinides which are found in large quantity, they also carry small amount of Neptunium and Plutonium in their ores.
Almost all the actinides are artificially prepared by the nuclear reactor and used to prepare bombs. They explodes when expose in nature.
Actinides are also radioactive in nature, thus it is used for making cardiac pacemakers.
Thus, there are many Actinides which are abundant in nature.