MNB Chart, page-267

LKE options; "The Additional Options will have an exercise price $0.75 each, expiring on 15 June 2022"
There is only four months left on the LKE options. They are currently at 28c with the heads at 90c.
28 + 75 = $1.03.
That means the premium is 13c on LKE options despite the relatively short remaining time to expiry. I don't see value there. I would be a seller of those options in favour of the heads. With LKE, the sp has to rise above $1.03 within 4 months for a buyer today to just break even. Markets are volatile and LKE is years from production. Four months seems too risky. Buying the heads instead gives upside of 14% to $1.03.

MNB options at 8c + 15c to exercise = 23c which is a 7c premium despite the much longer time to expiry at end of April next year of 15 months.
It's not quite that simple but the 7c premium on the MNB options looks relatively cheap based on time to expiry.
Production in less than a year and expiry in 15 months. Much stronger odds of a much higher sp for MNB before options expire and a lower premium. I find MNB options very attractive but they are less liquid so I probably have as many as I want now. I might still buy to trade them from time to time.