Between 2007 and 2013, Magellan Minerals completed 5 drill programs (179 holes - 28,437 m) which tested a number of veins on the Coringa property (i.e., Serra, Meio, Galena, Valdette, Mae de Leite, Demetrio, Sr. Domingo, and Come Quieto).
In 2016 and 2017, Anfield completed an infill drill program on the Meio and Serra veins to gather the additional information required to develop a mine plan. A total of 180 holes were drilled (25,212 m), most of which produced HQ-size drill core. Four PQ-size drill holes were drilled (284.8 m) for metallurgical samples.
Three phases of metallurgical were completed on the Coringa Project mineralization between 2008 - 2013.
2 composite samples were taken from each vein, as follows:
Meio - Galena - Serra
Belo Horizonte, Brazil
Gravimetric separation followed by floatation would provide best gold recoveries
Meio - Serra
RDI, Denver, Colorado USA
Conventional CIL milling circuit best treatment for gold recovery. Serra & Meio gold recoveries 99% and 97.7% respectively
Meio - Galena - Serra Como Quieto - Mae de Leite
Testwork Desenvolviment de Processo, Nova Lima, Brazil
Gold recoveries ranged from 92.4% to 95%
In 2017, Anfield conducted additional metallurgical testing
of the Serra and Meio veins at C.H. Plenge & Cia. S.A. in Lima, Peru. This work indicated that gold recoveries are 98%, and silver recoveries are 61% using gravity concentration followed by CIL cyanidation of the gravity tails. Metallurgical samples are representative of the spatial, geological and grade variations present at the Coringa project.