As part of the Barbarian Training update we have reworked a number of skill sounds so they are timed more accurately. This means that when you swing your pick to mine, or cast your rod into a Fishing spot, you will hear the sound of the rock being hit exactly when it should happen, these changes may also very slightly reduce lag when you are involved in these skills. The skills with updated sounds are Firemaking, Fletching, Mining, Fishing and Woodcutting.
As a side effect of this, you'll notice that the Mining animation has changed. Getting the Mining sounds to match up was a bit of a tough job, so we put some work into the animation to iron out those problems. The result is a really nice bit of work from the Graphics team that should make Mining a bit more enjoyable.