ocr: Strengths Considerable investments in Australian and Hawaiian property and hotels. Possible future as a tax haven. ealesses Phosphate, the only resource, 1s due to run out in 1995. Phosphate mining has left 80% oft the island uninhabitable and uncultivable. Nauru has been prone to poor investments, such as backang the flop London musical Leonardo"m1993.1 Nauru's tlagship Melbourne skyscraper,Nauru House, has developed "concrete cancer" which is costing millions of dollars to: repair.