Basically the same way you got the first. Go to the excavation site after 9:00pm with your hammer equipped. You should meet Carter there and he will ask you to use your hammer to blast another hole in the wall, thus openning the second mine. Note that you must have reached the bottom floor of the first mine (10th floor) and have defeated the 'dark chick'.
You can mine it in the 2nd mine at level 7-10
On Harvest Moon: DS and Harvest Moon: DS Cute, you get the third mine by reaching the bottom of the second mine, which is 255 floors deep.
it is in the second mine to get the second mine you have to complete the first mine
go into the mine after 8:00 pm
You can find Alexandrite on the first floor in the third mine.
You can mine it in the 2nd mine at level 7-10
On Harvest Moon: DS and Harvest Moon: DS Cute, you get the third mine by reaching the bottom of the second mine, which is 255 floors deep.
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Mine it in the 3rd mine
In order to get that, you need to mine in the third mine.
the mine level 2
There are several types of ores in Harvest Moon DS. Bronze, Silver and Gold are the main ones which can be found in the 1st, 2nd and 3rd mine, not sure about the 4th mine. There is also Mystril which can be found in the 2nd and 3rd mine, again not sure about the 4th mine. Hope this helps. :)
it is in the second mine to get the second mine you have to complete the first mine
Either in the mine or in the tent.
You can find it in the rocks in the 2nd and 3rd mine. Keep in mind it is quite rare. Hope this helps. :)
go into the mine after 8:00 pm
complete the first mine