Hi Ian,
We supply most of the slag to the Lower Mainland and are working on an EPD now that the updated PCR has been published. At this point in time we’re undecided if it will be a verified Type III, or a Type II as the intent is to use the data internally.
If you need something verified, your only current option is to use the SCA EPD available here: Slag Cement EPD This is being updated and should be available this year. You can see that the GWP is significantly lower than cement. As Kate has pointed out, for North America, slag is available in the Great Lakes area from domestic origins. The slags available on the West coast are from Asia. We import granules in approximately 50kt shipments and that means that the GWP of ground slag is lower than the last published SCA EPD based on the work we have done so far and that does include that Trans-Pacific freight.