Goodman Games

I'm a bit confused on how the Augment effect works.

Let's say my caster has a d8 +d6 for his casting.

He rolls a 10 for an Augment effect to the Basic Melee skill of an ally.

Does the ally get +10 to his Melee Ability Rolls for the duration of the effect?

You've got it right! Remember that the arcanist would need to maintain the spell, paying the cost each round.