Nothing to worry about, after initial blockchain download there will not be much bandwith used.

But you do not even have to run a full node to mine on a pool.
Just the mining software.
Mining software traffic is very low.

It has to ask the pool for new block from time to time. Guess default is 1-2 seconds ... but it is adjustable every 15 sec would be ok, too. And mining software will send the mining results back to pool.

Both are just a few bytes per request.