Northern Sun Mining Corp. - Environmental Compliance Approval (air)

This proposal is for an amendment to the Limited Operational Flexibility for an Environmental Compliance Approval (air & noise) No. 3613-A2KPR7 for Northern Sun Mining Corp., a mill processing nickel, copper, and gold ore located in South Porcupine, Ontario.

The emission sources from the manufacturing and associated processes that discharge to the air include:

• milling
• crushing
• material handling
• a warehouse
• a core shack
• an electrical shop
• a mechanical shop
• any other equipment and ancillary and support processes and activities

The amendment is to allow for the processing of gold ores with a facility production limit of 547,500 tonnes of ore per year, or 1,500 tonnes of ore per day.

Emissions to the air from this facility include:

• total suspended particulate
• arsenic
• cadmium
• chromium
• copper
• lead
• products of combustion such as nitrogen oxides

The Environmental Compliance Approval with Limited Operational Flexibility (air), when issued, permits modifications to the facility subject to limits on operational flexibility that include a production limit for the facility to be specified on the Environmental Compliance Approval with Limited Operational Flexibility (air).

The limited operational flexibility conditions have an expiry date. The company will be required to make an application for amendment at that time to renew these conditions.