You Do Need power plug adapter while traveling from Ireland (Eire) to Mali.

Here is Why You Need An Adapter

The outlet and plug type used in Mali are C and E and in Ireland (Eire) is G. This is how they look like.

Ireland (Eire)

In Ireland (Eire), outlets of type G are in use.

Type G

Mali

In Mali, outlets of type C and E are in use.

Type C

Type E