comsec shows announcement, page-9

the meeting is to ratify the previous issue of the approx' 4m shares and attaching options, by doing so, the company retains the ability to issue up to 15% of existing shares without shareholder approval.
The next time Mantle issues shares I'd expect there will be a much higher demand and a much higher price for the issue as the share price increases and the funds raised increases.
If for example they did another issue now ( hypothetically), it would raise about $2m or about 3 times what the last one did.
If the share price is around $1 next time, it would be reasonable to expect to raise about $3.4m.
Either way, it's probably not enough for the advanced exploration needed to close in on production.
With three resources to evolve into production and mining, there is likely to be a more significant capital raising.
I doubt there would be any shortfall in take up.
Ideally, there would be no placement to outside parties, rather a full offer to existing shareholders which would also be likely to trigger conversion of existing options to be eligible.