Anfield Gold Corp. is pleased to announce the results from its last round of metallurgical testing for the Coringa Project. The results were positive, demonstrating recoveries of 98% gold and 61% silver.
These results were achieved by testing a master composite representing mineralized material from the Meio and Serra zones of the Project using gravity concentration followed by carbon-in-leach ("CIL") cyanidation of the gravity tails. The master composite was a 50/50 blend of mineralized material from each zone that utilized core from 19 out of the 229 drill holes that have been completed across both zones. The master composite also responded very well to whole ore cyanidation with gold extraction rates similar to those obtained by gravity concentration followed by CIL cyanidation; however, whole ore cyanidation was shown to have 9% lower silver recoveries.
Anfield anticipates using gravity concentration followed by CIL cyanidation of gravity tails in the final flow sheet for the Project's feasibility study, expected in July 2017.
The metallurgical testing was undertaken by C.H. Plenge & CIA S.A. ("C.H. Plenge") at its laboratory in Lima, Peru. C.H. Plenge is not related to Anfield.
Permitting and Project Activity Update
On May 10, 2017, Anfield received formal consent for the Project from the Instituto Nacional de Colonização e Reforma Agrária ("INCRA"). INCRA's consent was required by the Secretaria de Estado de Meio Ambiente e Sustentabilidade ("SEMAS") as a pre-requirement to issuance of permits for the commencement of construction and operations at Coringa. Anfield continues to engage with SEMAS as the agency works to finalize and issue the required permits.
Pre-construction activities at Coringa continue to advance, with the latest developments listed below:
- The mine camp is complete and has been upgraded to accommodate over 200 staff during operations.
- Security fencing around the perimeter of the camp areas has been completed.
- Groundwater supply for the camps domestic water needs has been identified and tested.
- Mine design, planning and scheduling work based on the updated mineral resource estimate (May 3, 2017 news release) is being developed for incorporation into the feasibility study.
- Site wide hydrological and geochemical modeling will be completed by the end of May.
- All field and laboratory investigation programs in support of the design of the process plant and related infrastructure, tailings storage facility and mine workings have been completed.
- Feasibility level tailings storage facility design and scheduling have been completed.
- Detailed project engineering and cost estimation is approximately 50% complete.
Quality Assurance and Quality Control
All Anfield sample assay results have been monitored through a quality control / quality assurance ("QA/QC") program including the insertion of blind standards, blanks and the reanalysis of duplicate samples. The results of the QA/QC program and the resampling program indicate that the sample database is of sufficient accuracy and precision.
Nelson King, SME Registered Member and Metallurgical Consultant to Anfield, is a Qualified Person as defined by National Instrument 43-101 Standards of Disclosure for Mineral Projects. Mr. King has assisted Anfield in the development and direction of the metallurgical testing program for the Project, has visited C.H. Plenge's laboratory in Lima to observe the testing program, and has reviewed and approved the content of this press release relating to the metallurgical testing. Mr. King also verified the results of the metallurgical testing.