Facts, page-41

How much high grade Mn ore does Indonesia have? I have seen no quantities of high grade ore quoted, although West Timor does have high grade Mn ore. I do note that this high grade ore has a low Mn/Fe ratio too.
Why does GMC confuse investors with mixed messages ie.
The ASX-listed junior says the proposed facility will import ores from ASEAN-based operations for blending with local ores. The ore will be sourced through long-term supply contracts with local and overseas ore producers.
Gulf says discussions are under way to finalize contracts, with 75% of ore requirements coming from the local market and the remaining 25% from overseas suppliers.

"Indonesia is known to have a large low-grade manganese ore reserve. Nevertheless, it could not be used optimally in producing ferromanganese due to their low Mn/Fe ratio. In this present study, the beneficiation process had been applied to the low-grade manganese ore. Reduction roasting was conducted to this manganese ore at 700°C for an hour and then continued with low-intensity magnetic separation. This process had improved the Mn/Fe ratio from 1.39 to 6.11. The effect of basicity on ferromanganese production from this beneficiated low-grade manganese ore had been investigated clearly in this experiment by using mini submerged arc furnace (SAF). Several basicities for 0.7 and 1.0, was used and it was controlled by the addition of limestone in this smelting process. From this experiment, the ferromanganese containing 60% Mn was obtained from smelting the beneficiated low-grade manganese ore with the optimum basicity 0.7."

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.296.7014&rep=rep1&type=pdf

Ferromanganese production from the mixture of medium-grade and low-grade Indonesian manganese ore

Accepted 17 Dec 2017
Published online: 22 Dec 2017
In this present work, the ferromanganese was produced by mixing two different grades of Indonesian manganese ore. The possibility of mixing medium-grade manganese ore (27.77 Mn–4.44 Fe–14.7 Si) and low-grade manganese ore (16.39 Mn–19.22 Fe–20.23 Si) to produce ferromanganese was investigated clearly. The 30 Kg of manganese ore mixture was smelting by using sub-merged arc furnace (SAF). The composition of manganese ore mixture in percent weight to produce ferromanganese was 100–0, 75–25, 50–50, 25–75, and 0–100 for medium-grade and low-grade manganese ore, respectively. These ores were smelted together with stoichiometry cokes. Limestone was added in this smelting process to obtain 0.75 of basicity in this smelting process. The chemical composition of ferromanganese was analyzed with X-Ray Fluorescence (XRF). From the smelting process, the ferromanganese with 31.13 Mn–59.84 Fe–7.84 Si and 75.19 Mn–20.17 Fe–3.27 Si were resulted from 100% of low-grade and medium-grade manganese ore, respectively. The Mn-content in ferromanganese and the yield of ferromanganese production were decreased with the increasing of low-grade manganese ore in the mixture of low-grade and medium-grade manganese ore smelting process.