RE: Havieron29 Oct 2023 16:21
Havieron is a mixture of minerals dominated by the gold content and 20% of copper content.
However they’re not consistent right through the ore body.
There are 2 types of mineral bearing rock , the SE crescent sulphides and the breccia.
Havieron was formed over millions of years with lots of intrusions from the source at depth.
In simple terms it looks like a lava lamp where turning on an electric bulb heats up wax which rises to it cools and sinks again to be reheated and the cycle continues.
Initial heat and pressure would have formed the first crackle breccia where the local rocks are cracked by heat and pressure from below. These cracks are too small for liquids to move through but over time these cracks are widened and hot liquids enter forming quartz veining, this is the cemented breccia.
The oval shape of Havieron would have continually been under reheating and cooling, when the rock cools shrinkage cracks appear, this is where I think the oval shape crack appeared around the perimeter to eventually allow hot sulphide liquids to rise up through from below.
This isn’t magma this is hot hydrothermal fluids rising up from below rich in minerals.
The magma is still way down.
There are a lot of other minerals at Havieron besides gold and copper but they will be dispersed throughout the orebody in zones depending on what intrusion they came up with.
The sulphides as seen in HAD006 contain cobalt from top to bottom but only background traces of nickel ( this tends tends to be nearer the magma).
There are reports from Newcrest that there’s Molybdenum in the sulphides.
Damien Stevens presentation indicated Tellurium and Tungsten in the sulphides but these are in the Northern mining front.
Lanthanum and cerium were reported in the MMI surveys.
The breccias are not likely to have such a great range of varying minerals but the Eastern breccia has been reported as having Crescent type grades, here it is likely to be where the nickel concentrations are and possibly cobalt.
The mineralogists at Telfer will be scratching their heads to see what can be retrieved and from what zones.
Very exciting what will happen, will they won’t they go for the cobalt and other minerals.
Shaun said if they run Telfer they will try and get everything out that they can.
Lot of credits could reduce the AISC to low levels.
Lots of geologists will have totally differing views on the formation of Havieron and my thinking is the lava lamp is plausible in my view. 🙂
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