Groote Eylandt syndrome is due to the toxicity of:-

Clinical Features of manganese toxicity Acute manganese poisoning is extremely rare. Chronic exposure to manganese dust or fumes results in the following: Dyspnoea, bronchitis, pneumonia. The manganese miners on an Australian island (Groote Eylandt) have been repoed to be afflicted with a peculiar neurological disease characterised by upper motor neuron and cerebellar signs, and oculomotor symptoms (Angurugu syndrome or Groote Eylandt syndrome). Parkinson-like syndrome (manganism)--tremor, rigidity, ataxia, amnesia, and abnormal gait. In addition, there may be nystagmus, paraesthesia, "whispering speech", lumbosacral pain, urinary incontinence, impotence, etc. Manganese madness ("Locura manganica")--insomnia, confusion, anxiety, hallucinations, and bizarre behaviour. "Metal fume fever" has been repoed after inhalation exposure to manganese oxide fumes