text: Cyanide Management 
  
  At Challenger tailings are stored in an integrated 
  waste landform (IWL). This is essentially the 
  same as a traditional tailings storage facility 
  but is built to blend into the waste dumps. 
  Groundwater monitoring bores located around 
  the Integrated Waste Landform (IWL) were 
  sampled quarterly in line with Challenger’s 
  approved Program for Environment Protection 
  and Rehabilitation. The supernatant pool water 
  was well managed throughout the year with the 
  cyanide concentration remaining below the 
  adopted guideline limit of 0.5 milligrams per litre 
  (mg/L), within the TSF. To date cyanide ground- 
  water quality has remained below the revised 
  reporting limit of 0.08 mg/L. 
  
  The triennial noise and hygiene survey was 
  conducted in 2012 and comments on dust survey 
  results. All respirable dust results were below the 
  set exposure standards for atmospheric contami- 
  nates. Higher than limit inhalable dust results 
  were recorded from the lab technician and 
  crusher operator, who wear a P2 dust musk as 
  personal protective equipment to reduce the limit 
  of dust inhaled. Underground dust results were 
  all below the recommended limits. 