The discharge of contaminants into air associated with any production or processing (including melting and secondary melting and sweating) of aluminium, ferrous metals, bronze, copper or brass where the aggregated melting capacity not exceeding one tonne per hour, is a permitted activity subject to the following condition:
Explanation and Principal Reasons for Adopting Method 184.108.40.206
Rule 220.127.116.11 is restricted to the discharge of contaminants to air involving the processing of aluminium, ferrous metals, bronze, copper and brass. This includes the melting of these metals including secondary melting and the sweating of scrap metal. Secondary melting involves the melting of processed ore, whereas the sweating of scrap metal is a process involving the heating, usually of metal components, to extract valuable metals.
The production and processing of metals at a rate where the aggregated melting capacity is less than one tonne per hour are not likely to result in any adverse effects. Any activity that does not meet the thresholds or conditions in this permitted activity rule is a discretionary activity (refer Rule 18.104.22.168). This is because of the potential significant adverse effects on human health from the discharge and the potential to release objectionable contaminants into the atmosphere including those of a hazardous nature.