| Project Description | Waihi North Project Air Discharge Assessment - Waihi Surface Facilities | 4396626-1331619777-99 | 16/06/2022 | 17 An estimated 99% of the mercury content of the sludge is expected to be vaporised in the oven. Of this vaporised mercury, 99.5% is expected to be recovered as a liquid in the retort condenser and the remaining 0.5% emitted to the atmosphere 89. 8 United States Environmental Protection Agency (USEPA). 2001. Draft Mercury Mass Balance Emission Factor Estimates for Gold Processing Facilities. 9 United Nations Environmental Programme/Secretariat of the Minamata Convention on Mercury. 2019 Guidance on the Best Available Techniques and Best Environmental Practices.
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