Both SYR and KNL projects have studies done to Feasibility Status done within the guidelines of the JORC code. Both studies were done with reputable consultants. Location wise both projects are in locations very close to each other. It is not that remote as it seems.... they are an international flight, a 3hr regional flight and then a 3hr drive along a good highway. This is not dissimilar to many projects in Australia, The mining industry is now global and can handle very remote locations. Generation of power in remote locations is done very effectively. The upshot of this is that unless you have specific knowledge that can question any factor considered by these studies, then I think the numbers should be accepted within the framework of accuracy under which they are provided ( accuracy for a +- 15% for a Feasibility Study).
I think as an investor if you want to "invest" in resource companies, you have to choose trust these numbers as these are the best that the industry can offer. However that does not remove the inherent risk in mining stocks due to the nature of geology, weather impact, commodity markets, etc etc - and there are many risks in the mining game.
Personally I think the overwhelming risk with both of these companies is their strategic position in producing and selling an exotic commodity - graphite - in opaque market.
