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

http://www1.ifc.org/wps/wcm/connect/topics_ext_content/ifc_external_corporate_site/ifc+syndications/overview_benefits_structure/overview_benefits

IFC Global Mining (See p.10-12)

http://www1.ifc.org/wps/wcm/connect/434c0a0049a5f8cda3d0e3a8c6a8312a/IFC+Mining+Overview.pdf?MOD=AJPERES

Mining finance through the cycle in frontier countries

http://www.global-mining-finance.com/gmf-autumn/pdfs/IFC.pdf

Investing with IFC in Emerging Markets

http://www.verslilietuva.lt/uploads/file/3d%20Baltics%20Agribusiness%20presentation_Vilnius.pdf