He then joined the new Adelaide Rams franchise in 1997 and was in their inaugural side for their match against the North Queensland Cowboys in Townsville on 1 March 1997 for the new Super League season. He spent two years at the ill-fated club, becoming a favorite with the Adelaide fans for his never say die attitude in a team mostly made up of some talented juniors and off-casts from other clubs. As a PNG test player, Mamando was one of the Rams few high-profile players, alongside team captain and former Australian test player and Brisbane Broncos premiership HookerKerrod Walters. He played 16 games for the Rams, scoring 5 tries.
In 1999, Mamando was a member of the Sydney Roosters squad for the 1999 season, but failed to make an appearance, due to niggling knee injuries.
In 2000 Mamando again represented Papua New Guinea at a World Cup. Earlier that season he had joined North Queensland. In 2001 he withdrew from the Papua New Guinea side, citing concerns over selection policies.[3]