Mining began in the 1950s on the beachfront and this caused minimal disruption to the environment. However, as mining moved into the interior of the island in the late 1960s and increased in scale and size in the 1970s, the impact on Stradbroke's ecosystem increased with Consolidated Rutile Limited (CRL) starting dredge-mining on Stradbroke's high dunes. There are several accounts from sand mining employees of unusual artifacts being found during dredging operations. Dredge mining involves levelling the high dunes and stripping vegetation to create the dredge pond and this dramatically changed the landscape of Stradbroke. The dredge is continually moving, leaving the tailings sand, so, although the mined dunes are revegetated and stabilised, the original ecology of the Island cannot be replaced. As an alternative, development of the island for seaside residential use was mooted and in 1970 a bridge from the mainland via Russell Island was under serious consideration by the Queensland government. The Queensland Government also proposed a large-scale redevelopment of the island in the mid-1980s which would have seen the population of the island increase tenfold. However, after a concerted bid by conservationists and planners concerned at the impact on wetlands, fish breeding grounds and the impact of population growth, the idea fell from favour in February 1986 when Premier Bjelke-Petersen ruled the idea was not "financially viable".
