The massive rock is moving towards the miner and if you won't do anything, the result will be terrible. Throw a pickaxe towards the wall, where two or more similar rocks are located. Destroy them and stop the wall for a while.
A gold hunter should always count risks before he accepts the job. This time a real danger comes from the massive rock right in from of you. Stop the moving rock by throwing a pickaxe towards its direction and hit two or more similar blocks. Smash them to stop the rock and survive a certain amount of moves to complete the level.