Hope Valley is a sub-suburb of Postans, which is a suburb of Perth, in Western Australia. The Postans Alumina plant’s tailing ponds are about 1.5 KM from the plant itself. The odd colors of the water in these ponds comes from the variety of minerals and other contaminants from the aluminum making process.
Those whose answers came fresh included:
- Paul Voestermans
- steve willis
- Eloy Cano
- Phil Ower
- Mehmet DURMUS
Those who needed their answers wrapped in foil (after the hint):
- Steve J.