Indonesian forces exchanged fire with gunmen yesterday and killed a suspected rebel, a day after two American schoolteachers and an Indonesian were shot dead near a huge copper and gold mine run by a US corporation...Regional armed forces chief Major-General Mahidin Simbolon arrived yesterday in Timika, near the immense open-pit mine operated by PT Freeport Indonesia -- an affiliate of US-based Freeport-McMoRan Copper-and-Gold Inc. For many Papuans, the operation is a symbol of unwanted Indonesian rule.