In the game Legend of Zelda spirit tracks where can i find an item called a dark ore?

I think maybee after you beat the game or get your freight car and talk to linebeck III he will ask you to bring him an item called a dark ore. i suppose its a treasure item but its description is its found in the dark and melts if it touches sunlight. anyone know it?

here you goo:

http://www.gamefaqs.com/portable/ds/file/959019/58699

it shows all the places were you can get the Dark Ore

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