In mining-speak, "gawn" means permanently gone, and not coming back, so don't even talk about it anymore.
(If you want to talk about something that's gone only temporarily, you'd say that it's "f*cked off", for example, like one guy said when he got accidentally left behind at the bus-stop: "The f*ckers have f*cked off, f*ck'em!" ... but if you mean that something's really gone forever? It's gawn, eg, "have you seen my stapler? I think it's f*cked off somewhere." "Nah mate, she's gawn. You'll have to get a new one.")
That John Howard, he gawn. Finally.
What a relief.