Anyone know why they are using CHESS depository instruments...

Anyone know why they are using CHESS depository instruments (CDIs) when both Benz and Spartan are ASX listed. I've only come across CDIs in the context of companies not primary listed on the ASX. I thought using CDIs and not common scrip affected being able to vote at company meetings and being eligible for dividends ( both yes with shares but no with CDIs).

Seems to me a real opportunity for Benz remembering that it was the project almost taken into development over Dalgaranga by Gascoyne. But of course not in the same league as Never Never so good work by Spartan to move it on.