This is the easy part.

• Further down you can see the picture of the map which has (almost) every single coin location on it.
  
  
  
• Once you collect 10 coins, the map in game will display every coin location.
  
  
  
• Once you have collected every coin on the map (100/100) head to the bottom left part of the map, which is to the left of field #40.
  
  
  
• You will see a road leading into the woods, there is a plain wooden cabin with a cart outside of it. Behind this house is a well, go up to the well and activate it to unlock the prize!

Thanks to Steam User Vanquish081 there is a video in Spanish (Español)

When you finally obtain all 100 gold coins, and go to the well you will get 200.000L of every almost every single sellable item (Wheat, Barley, Canola, Potatoes, Wood Chips, Sugar Beets, Corn).

Here is an example of what you are looking for

Here is the map after you pick up 10 of the coins. You can use this to find 10 easily!

Here is a rough estimate of where the well is.

Some other quick info:
1. These aren't in multiplayer
2. The map isnt 100% complete, its missing about 10 coins which I used to get the map. It will show them in game.
3. If you can't find the coin, use the player icon to collect the coin. The gold dot will fill up the black hole completely.

From here on out it is smooth sailing. Dont forget to like my guide if it helped!



Happy Farming!