Aquila improves recoveries at Michigan-based Back Forty project
TORONTO (miningweekly.com) – After completing comprehensive and integrated metallurgical testwork, TSX-listed project developer Aquila Resources on Monday reported that it had improved recoveries and the potential for increased production of its flagship Back Forty project's two main metals, gold and zinc.
Gold recoveries improved to 63%, up from 61%, and zinc recoveries improved to 93%, up from 91%, when benchmarked against the company's June 2014 preliminary economic assessment (PEA).
"We are encouraged by the positive results of our metallurgical test programme. Improved recoveries for gold and zinc clearly suggest the potential for improved metal production and ultimately improved economics at Back Forty.
“We will be further quantifying and evaluating the impact of these results on Back Forty's project economics during the course of our work on the feasibility study, which is being developed in parallel with our permitting activities, both of which are expected to be completed before the end of 2016,” advised Aquila VP for project development Andrew Boushy.
The metallurgical testwork, which was conducted by SGS Canada, in Lakefield, analysed new representative samples indicating that the mineral resource was an aggregate of four metallurgical zones, namely three sulphide zones (Main, Pinwheel and Tuff) and one oxide zone.
Further testwork performed on composite samples for each of these ore types revealed a gradient, with higher-grade samples generally exhibiting improved recovery compared with lower-grade samples. When new recovery equations were applied to the PEA mine plan, the impact on recovery ranged from a 2% improvement for zinc to a 15% improvement for silver.
Testwork also demonstrated that more gold and silver could be recovered from the zinc concentrate. Additional work would be performed to determine whether the concentration of precious metals in zinc concentrate would meet the required payable threshold.
Aquila stated that the positive results of the metallurgical test programme provided the company with the basis to finalise its process design, a key step in the development of the Back Forty feasibility study. Aquila expected to complete the feasibility study, including an updated resource and mine plan, by December.
Lycopodium Minerals Canada was currently designing the processing plant and provided input for the comminution testwork.
Comments
Press Office
Announcements
What's On
Subscribe to improve your user experience...
Option 1 (equivalent of R125 a month):
Receive a weekly copy of Creamer Media's Engineering News & Mining Weekly magazine
(print copy for those in South Africa and e-magazine for those outside of South Africa)
Receive daily email newsletters
Access to full search results
Access archive of magazine back copies
Access to Projects in Progress
Access to ONE Research Report of your choice in PDF format
Option 2 (equivalent of R375 a month):
All benefits from Option 1
PLUS
Access to Creamer Media's Research Channel Africa for ALL Research Reports, in PDF format, on various industrial and mining sectors
including Electricity; Water; Energy Transition; Hydrogen; Roads, Rail and Ports; Coal; Gold; Platinum; Battery Metals; etc.
Already a subscriber?
Forgotten your password?
Receive weekly copy of Creamer Media's Engineering News & Mining Weekly magazine (print copy for those in South Africa and e-magazine for those outside of South Africa)
➕
Recieve daily email newsletters
➕
Access to full search results
➕
Access archive of magazine back copies
➕
Access to Projects in Progress
➕
Access to ONE Research Report of your choice in PDF format
RESEARCH CHANNEL AFRICA
R4500 (equivalent of R375 a month)
SUBSCRIBEAll benefits from Option 1
➕
Access to Creamer Media's Research Channel Africa for ALL Research Reports on various industrial and mining sectors, in PDF format, including on:
Electricity
➕
Water
➕
Energy Transition
➕
Hydrogen
➕
Roads, Rail and Ports
➕
Coal
➕
Gold
➕
Platinum
➕
Battery Metals
➕
etc.
Receive all benefits from Option 1 or Option 2 delivered to numerous people at your company
➕
Multiple User names and Passwords for simultaneous log-ins
➕
Intranet integration access to all in your organisation