From his appointment announcement on 6 Jan:Material Terms of...

From his appointment announcement on 6 Jan:

Material Terms of Employment
 A Base Remuneration which is a monthly salary and will be reviewed
annually of A$240,000 per annum;
 A Short Term Incentive of 30% of Base Salary which will be reviewed
annually and will be paid on achievement of near term milestones
(KPI’s). The KPI’s will be as follows from now until the end of June 2020:
o Delivery of ETFS, Mining Licence and ESIA by end March 2020;
o Delivery of FID / EPCM contract by end June 2020; and
 Long Term Incentive Performance Rights of two tranches of 1 million
(total 2 million) which convert to ordinary shares in the Company. The
Performance hurdles are as follows:
o Commencement of Construction by end December 2020; and
o Commencement of concentrate sales by end of 2021.

This is the issue of the performance rights, which don't vest until the noted performance metrics are met. Not sure why it's 4 million and not 2 though - will have to have a look through subsequent announcements for why that is.

There are more details in 7th Feb announcement re: employee incentive plan, but I couldn't find anything relevant as to why there are 4 million rather than 2 being issued.

Honestly, if those long term performance metrics are met (construction & sales) we'll all be happy campers anyway, though it's a pretty generous bonus. Interests are aligned well and truly.