The fact that the price is holding up relatively well this morning (thus far) arguably says more about the strength of FFX than it does about the stability of Mali. All it's really done here is cancel out the K2 announcement.
It's not like this is the first time the Malian Army has stepped in and yeeted a President and/or PM, and the market knows it. There's a lot of sovereign risk already baked into FFX's SP; it's this sovereign risk that'll keep FFX's SP at a discount to many of its peers for the foreseeable future. No biggie, as it's only the difference between going to the moon and going well beyond the moon.
