I can't speak for 3D animators, but for 2D frame by frame, a foot of animation which is 16 frames (24 frames per second), is between $200-400 per worker. And those jobs include rough animation, tie down, clean up, and colour, effects animation, prop animation, and a lot more- all of which can include multiple characters. Your initial payment covers so little of that it's barely worth it, unless you're looking to hire amateurs who are uneducated in the field and have nothing better to do than poorly done rushed work. Not even students like the above poster stated. Students who have practical knowledge and experience would only be ripped off by working on this project.
As far as I know from my 3D experience, it is just as time consuming, and the animation break down is done in a similar process to 2D. Not simply manipulating a model, which would also need to be built and properly rigged.
This should be in the projects section if you're looking for a partnership, because there is no way you can get a film that length in a timely manner with that amount of money. Because with the time it would take, your animator(s) would be busy with a real paying job, there's no way that your offer could support them.