Originally it was called Xstrata and the small corporate headquarters were in Sweden with the head office actually in Spain.
I'm not sure where Glencore is based out of, I believe it's also a Swedish company but not 100% sure. They have multiple mines in Queensland/NT (3 or 4 around where I work concentrating on Lead and Copper surface and underground mining). They also do coal mining around Mackay and also coal and maybe some other mines in NSW and WA.
They have mines all over the world though, Glencore is the worlds biggest mining company after they took over Xstrata