How do you get the second mine in Harvest Moon DS Cute?

Answer 1

You must reach the last floor of the first mine. there are ten floors. Then all you have to do is activate the scene with Carter again.

Enter the Dis-Site very early or late in the evening when no one is inisde. Bring your Hammer and you should get the scene where Crater has you open the way to the next mine.

Answer 2

you can find different types of gems and a few minerals and stuff to upgrade your tools. all of the gems and things can be found deeper in the mine, you can also get all of the four sun things to grow crops in your basement. you can also get a lot of worthless stuff. if you use the hoe thing then you can find coin piles with 10 - 50 coins in them and edible black plant things like the ones you get in the field that are yellow and brown and stuff.