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LC and MC FeMn pricing have nothing to do with the input grade of the Mn, sadly you are mistaken. The Mn can easily be beneficiated to the required grade input. Sadly the GMC management haven't told you the truth. Plus South Africa holds undeveloped Mn high grade deposits> ie Ntsimbintle is presently getting one new large operation organised for production. Needless to say OMH owns 26% of Ntsimbintle.
If you think that GMC will get an extra 20% or more than the spot price for any grade of FeMn then you are dreaming.
If I truly thought that GMC was a good proposition I would buy at 1.1c, but I'd rather put my money into better stocks like OMH and S32 ( the only successful smelters and Mn miners on the ASX) .
Frankly stocks like Grange GRR with $200 million in the bank and paying a 1c/share divi ie 14.4% return including franking credits is a far smarter move than investing in a company like GMC which has now given away 25% of the project for peanuts, GMC will have maybe 8 billion shares by the time it becomes even close to profitable, and yes the power price is my major concern because power is far more significant than GMC shareholders realise.
The Indians are all crying about the cost of power.
A mention of cheap Malaysian power in the March 2018 Steelworld magazine page 13
http://steelworld.com/newsletter/2018/march18/sw-march-2018.pdf

Might pay to read instead of burying your head in the sand.