Harvesting/mining

[DJMoran]

Everytime I mine something or hevest a herb/mushroom/flower a horizontal green bar comes up which moves from side to side and a vertical yellow bar somewhere on it.

My question:
What is this bar for? What does it do? And how do you use it?

[XpierulesX]

If you click the green bar on the yellow line at the right time, you'll automatically be done harvesting it. (It's very hard though :))