In a small bowl, mix together the raisins and rum. Continue to mix every couple of minutes while preparing the cookie dough.
Preheat the oven to 350°F. Line 2 cookie sheets with parchment paper and set aside.
In a large bowl, cream together the butter and sugars until light and fluffy. Slowly mix in the eggs one at a time, beating after every addition. Mix in the vanilla.
In a separate bowl, mix together the flour, baking soda, cinnamon, nutmeg and ginger.
Slowly mix the dry ingredients into the wet ingredients until fully incorporated.
Add in the oats and the bowl with the raisins and rum. Mix until just combined.
Using a medium cookie scoop, scoop the cookie dough onto the prepared cookie sheets and bake in the preheated oven for 8-10 minutes, or until the edges of the cookies begin to look golden.
Allow to cool on cookie sheets for around 2 minutes before transferring to wire racks to cool completely.