IFC does not lend money until a mining company has all the papers (license, Environmental and social impact assessment, etc.). Given Ethiopia current status (developing economy), the long-term prospect of Allana's projet (25 years), and the interest of IFC with the devlopment of agriculture in Africa, I'm guessing from what I read on IFC that we may receive something like $75-100 million in debt and raise $10-30 million in equity from IFC. The rest will come from Liberty, International and Development banks, etc.
Various types of debt financing provided by IFC
IFC Global Mining (See p.10-12)
Mining finance through the cycle in frontier countries
Investing with IFC in Emerging Markets