Review of Talisman study indicates commercial developmentRoss Louthean — 21 March 2012
A scoping study review of the Talisman gold project at Karangahake near Waihi has indicated the project could be a robust and highly profitable operation.
Owner Heritage Gold NZ Ltd (ASX: HTM & NZX: HGD) said that the review that takes in unmined sections of the historic Maria vein system.
Assuming a 7.5% discount rate the project was considered to have a net present value (NPV), off over $A150 million ($NZ192.3 M).
This includes, the company said, a conservative 25% contingency on all operating costs. The maximum cash outlay at any time in the 12 year project is $A20 M ($NZ25.6 M), which occurs in year four.
Manging director Peter Atkinson said that overall, the review showed that the project is robust in the price range of $A1,200 to $A2,000 per ounce of gold and has a break even gold price of under $A1,000/oz ($NZ1,282/oz).
Using the base case assumed gold price of $A1,600/oz and a silver price of $A30/oz, the review gives an internal rate of return (IRR) of over 70%.
A review of a previous scoping study for the Karangahake project was recently completed by Melbourne-based mining consultants Mining One Pty Ltd.
Mining One was engaged by Heritage to update previous studies on Talisman. The main background for the review came from two prior independent studies as well as a range of design files and geological models.
The review used the mining schedule from a previous study in 2008, with some amendments to prioritise mining of accessible and high-grade ore in early production and defer less accessible low-grade ore .
The study was based on a 12 year mine life, with staged development building over six years to reach 150,000 tpa.
The study assumed average ore grade would be 10.2 g/t Au with 95% recovery and 14.3 g/t Ag with 65% recovery and processing plant operation of 24 hours a day for 365 days a year.
Atkinson said Heritage now plans to advance the project through drill testing and geological studies to increase the confidence level of high-grade ore zones, particularly the known gold mineralisation which is easily accessed.
Heritage is starting a project development study to include mining and processing options, mine design and scheduling.
Project studies will be carried out through the balance of this year and into 2013.
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