SHG Zinc Carbon Footprint
This document provides practical guidance on calculating the carbon footprint for special high-grade (SHG) zinc. The guidance was developed through a thorough process of reviewing existing methodologies, applied industry expertise, and preserving compliance with ISO 14040 and 14044, as well as with the Product Life Cycle Accounting and Reporting Standard by Greenhouse Gas Protocol.
Exemption rule
The current version of the guidance has an exemption rule of max. 1% of emissions at individual attributable processes, and cumulative at max. 3% of emissions overall
This is stricter than PACT and therefore, no other additional action is needed
Allocation
The current version of the guidance allows for several allocation routes without specifying which one is the most appropriate when
To align with PACT Methodology: Use the allocation decision tree as indicated in Chapter 3.3.1.4 Figure 8 of the PACT Methodology
Biogenic emissions and removals:
Not been relevant for this product, so not currently included. Some innovations are currently researched and the aim is to be included in version 3.0.
Validity period
The current version of the guidance recommend to update PCFs at least in a 5-year cycle or whenever a significant change occurs in the production process or any other parameters affecting the PCF
To align with PACT Methodology: Follow the 3-year cycle or earlier if > 10% variance criteria as indicated in Chapter 6.1.2.1 of the PACT Methodology
Data quality metrics
The current version of the guidance does not mandate the calculation of any specific data quality metrics
To align with PACT Methodology: Use the data quality metrics as indicated in Chapter 4.2 of the PACT Methodology
Assurance and verification
The current version of the guidance does not include specific requirements about the level and basis for assurance and verification
To align with PACT Methodology: Follow the requirements specified in Chapter 5 of the PACT Methodology
