Depends on which Linux Mint version you are using. Assuming you are using a supported version of Linux Mint (13 or above), configure the Upstart services for these to not start automatically. I recommend you keep at least one virtual console functioning so you can use that in case you run into problems with your graphical desktop. In any case, this will not save you any significant amount of RAM or CPU if that was your intent.
To disable the virtual console at Ctrl+Alt+F1:
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echo manual | sudo tee -a /etc/init/tty1.override
Repeat the command for the other 5 as desired, replacing 'tty1' with 'tty2', 'tty3', and so on.