Smurfs' Village mountain digging

I think you have probably heard of the feature that lets you dig in the mountains in Smurfs' Village. Although you might find it as being a great way of getting experience points, the guys from MySmurfsVillage conducted a test that revealed that mountain digging is more than not a waste of time.

From what you can find on their site as well, the cost of this "whole" adventure, 5000 digs, costed 1.000.000 coins. In the chart below, available on the MySmurfsVillage as well, you can see the stats of the 5000 digs. 

With all the stats collected and a simple mathematical ecuation, it seems like, going the mountain way, the prices on Smurfs' Village are the following:

1. XP x1 = 4.2 coins
2. Wood x1 = 351 coins
3. Stone x1 = 368 coins
4. Dye x1 = 1.503 coins (expensive)
5. Smurfberries x1 = 45.852

If you have never played Smurfs' Village before, here you have a preview of the gameplay.