The most likely location will be the rectangle that is on the green surface, the one that is the most on the right of this picture.
The basalt is an igneous rock that is forming by the cooling lava on the surface of the Earth, or very near to the surface of the earth. According to this picture, the most suitable place for the lava to go to and accumulate, than to cool off and become basalt, is the green surface on the right of the volcano. And since the basalt rocks will form there, the chances of having aluminium ore are the biggest at that place.
