Steal a mine then drill a mine

Hi all,
If the first mine I obtain is by stealing someone else's what is the cost of the next mine I drill?
Do I pay 50 because it is the first mine I drill, or does it cost 100 because it will be the second mine I have?
If the first mine I obtain is by stealing someone else's what is the cost of the next mine I drill?
Do I pay 50 because it is the first mine I drill, or does it cost 100 because it will be the second mine I have?