Going from EVN's weight in the GDXJ of 4.55%, with a market value of $US196,998,746..... so 1% of the fund is nominally worth US$43,296,427 = A$56,222,575
If DCN were to qualify on liquidity as you say I think it will end up with a 0.5% weighting ie A$28,111,287 or 8.9 million shares at today's closing price.
I say "nominally" above because if the creation units in the ETF are made with borrowed shares I suspect that the "real" capitalisation of the fund can't be properly represented by market values of those shares. I'm going to look more closely into these ETF funds to try and get a better understanding of the real exposure they have to the markets they claim to reflect. Esh