How to get Gold & Silver Pickaxe?
1. Get "Gold Pickaxe" by completing Daily Quest and use it to harvest the Gold Clam.
2. Get "Silver Pickaxe" by collecting Daily Bonus and use it to harvest the Silver Clam.
3. Return on harvest day to find RICH TREASURE from one of seven clams with collected pickaxe.
4. Make sure to collect all seven pickaxes just in case!