You have to have passed the first two mines first and then go into the mine before 8am or after 9pm and you will see the same event you saw
to open the first two mines.
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It's called Adamantite and it's found in the 3rd mine on every floor in the rocks. You can unlock the 3rd mine by getting to the bottom of the first and second and activating the event in which you go into the mine after 10 p.m. You have to do the event after the first mine to unlock the second mine.
If you mean the third Harvest Sprite Channel in Harvest Moon DS or Harvest Moon DS Cute, all you have to do is rescue 20 Harvest Sprites. After your twentieth Sprite you will automatically unlock your twenty-first Sprite who runs Channel 3.
Yarn Maker Your sheep can be sheered to collect Wool, and you can convert that Wool into balls of Yarn for shipping or for giving as gifts. You will need a ball of yarn if you want a sock knitted for the Stocking Festival on Winter 25. So you will need to unlock the 3rd mine to get a ball of yarn
Mythic Stone is found in the 3rd. mine. Here are the floor numbers From floor 0 to 255, every floor that ends in 0. From floor 255 to 999, every floor that ends in 5.
Pink Diamond Floor 100, every 3rd floor And they are worth 10000 g