Pepper, why don't you post todays price of ferro manganese. The price is currently US$1475 (ie 24th Dec 2017), so you are way off with your pricing. Also note this is in warehouse Pittsburg USA.
Surely you aren't so foolish as to think that GMC will have any impact on OMH, have you looked at the share price lately?
OMH power cost is US$0.03c/KWH as against GMC US$0.11c/KWH. You must be a fool to even think that GMC would ever give OMH any competition. At US$0.11c/KWh GMC will be lucky to be in business if it actually does start up, because they won't make any money. It takes nearly 4,000 KWH to make one tonne of ferro Manganese. The extra cost of electricity for GMC is more than the cost of importing Mn ore from South Africa. Wake up mate.