It’s well known to extract plaintexts passwords, hash, PIN code and kerberos tickets from memory.
mimikatz can also perform pass-the-hash, pass-the-ticket, build Golden tickets, play with certificates or private keys, vault, … maybe make coffee?
mimikatz comes in two flavors: x64 or Win32, depending on your windows version (32/64 bits).
Win32 flavor cannot access 64 bits process memory (like lsass), but can open 32 bits minidump under Windows 64 bits.
Some operations need administrator privileges, or SYSTEM token, so be aware of UAC from Vista version.