The -Braveheart- actor blasted Oksana Grigorieva - with who he has an eight-month-old daughter Lucia - in a series of angry outbursts which see him calling her a "w***e", "f***ing fake" and a "****" several times.
In one taped tirade, RadarOnline.com claims he said: "You`re an embarrassment to me.
"You look like a f***ing pig in heat, and if you get raped by a pack of n***ers, it will be your fault."
In another row, the 54-year-old star threatens to "burn down" the Russian singer-s house.
He ranted: How dare you act like such a b***h when I have been so f***ing nice.
"I am going to come and burn the f***ing house down... but you will blow me first."
A friend of Oksana, 40, claims she was forced to tape her arguments with Mel after he made a series of death threats and says she hopes the recordings will be admissible in any potential trial.
The source said: "Oksana`s motivation for recording this was to show Mel how mean he was, and because she feared for her life.
"She wanted to get evidence that he was dangerous and violent."
Mel has reportedly heard two of the tapes and is trying to get them blocked.
The source added: "Mel is doing everything he can to suppress this... they are the rantings of a mad man."
Last week, Oksana filed for a restraining order against Mel, and allegedly claimed he had been "extremely violent" towards her, something which the actor-s friends have denied.
In 2006, Mel - who has seven children with ex-wife Robin - was arrested for drink driving and stunned police with an anti-Semitic rant.
The former couple appeared in court yesterday (01.07.10) for a closed hearing, where Oksana-s legal representatives are said to have "vehemently denied" she leaked the tapes, as she is the subject of a restraining order forbidding her to do so.