re: Ann: Indochine Reports Very High Grade Go... R ainmanNot...

re: Ann: Indochine Reports Very High Grade Go... R ainman
Not exactly
I am saying that humans focus on the obvious and sometimes can’t see the woods for the trees.
The Western Roscolite Zone (“WRZ”) is a good example of this.
Its only one outer extremity of the mineralization yet it got all the attention for 20 years.
Madison and Buffalo drilled out a deposit with a (very natural) focus on the WRZ.
However, they did not model or explore the true potential of what the evidence presented at Mt Kare.
The same thing happened at Porgera.
The "land slide" at Kare was not a single event in all likelihood.
Rather, it was a progressive event over a couple of million years caused by silicification of the ground (making it brittle and prone to fracturing) and the constant ingress of base metal carbonate fluids (“BMCF’s”) coming up through the C9 and Central Zone breccia from below, constantly saturating the subsurface rock and mechanically weakening the ground rendering it unstable
There’s a lot of direct evidence of this and in the process we have the formation of free gold growing in zones where BMCF’s coming from the C9 and Central breccia are mixing with fresh ground water, as in the Porgera model.
The massive free gold in the land slips is merely evidence of a much more significant event below the mountain and along strike from the WRZ the C9 Zone (“C9Z”) and the Black Zone (“BZ”).
What we do know about Mt Kare is that there are essentially two fundamentally different styles of mineralization, both forming within a period of less than 250,000 years.
? First, Base Metal Carbonate ores of (3-5 g/t gold and bonanza grades of silver)
? Then, high grade Roscolite ores (200-400 g/t gold and low in silver)
The land slippages where the gold rush occurred indicate the style of mineralization as high grade Roscolite and occurred along strike from the Black Zone (“BZ”) through to the WRZ.
It’s important to understand that these two different styles of mineralization indicate and differentiate a number of key historical events occurring over a period of 2-6 million years and two quite distinctive processes giving rise to mineralization at Mt Kare.
Simply stated, the lower grade gold (with bonanza silver) ore was ‘created’ by percolating hydrothermal BMCF’s at a temperature of + 400 degrees and under extreme pressures.
The high to bonanza grade Roscolite ores (200-400 g/t gold and low silver) was created later in the story with vastly cooler waters at much less pressure.
One must also remember that what we are looking at with Mt Kare is a history of events arising from the upward movement of hot volcanism and (initially) associated hydrothermal cells of super-heated BMCF’s also moving upward with the intrusive.
Most of the intrusive’ in the subduction zone in PNG tend to form a petal formation shape looking from above.
They present a radial pattern a bit like a flower with petals, but at the core, a circular zone.
This, as a general rule, arises from what we can call "point fracturing".
Listric faulting occurs at the outer margins of the point fracturing.
Mt Kare is a bit different, it’s far more elongated than circular, for more elliptical, with an axis WSW-ENE
Starting out at the Western end of the WRZ is a listric fault running ENE toward the center point of the intrusive axis, also intersection the C9 and Central and Black Zones and breccia pipes.
Assume listric faulting occurred at the same time as the intrusion.
Below the mountain and running WNW and, and dipping from the surface (on the southern side of the mountain downward in a northern direction) are a series of (North dipping) faults (“NDFs”).
These NDF’s postdate the intrusion.
At some point under the mountain this series of NDFs intersect the C9 and Central Zone breccia pipes.
At the Initial point of intrusion, gold and silver carried in base metal carbonate fluids percolating up under great pressure and heat from the magma chamber driven hydrothermal cells way down below and along the listric faults and in all likelihood the C9 pipe was a conduit in and product of that initial event.
The intrusive pushes up and as it nears the surface it spreads the ground above it into a series of radial fractures but lifts up the very margins on the ground a bit like when you pull out a weed .

On its out margins (say, at the WRZ) we will see the formation of listric faults which run from the outer edge of the intrusive of the fracture and dipping downward toward the center of the intrusive.
But the general characteristic is a circular pattern from 1500 + meters in diameter.
Porgera is about 6,000 meters.
The fracturing/faulting allows surface waters to mix with BMCF’s.
The mixing of the two aqueous fluids usually occurs at a later stage in the event and that’s when the Roscolite ultra high grade gold deposits are formed.
Ok, now let’s get back to Mt Kare itself and the East West North dipping fault (“NDF”) running under the mountain.
How should we picture the NDF in our mind’s eye?
When we talk about a “fault” in the ground we have to think of it in three dimensions.
From the surface the EWNDF appears to be a crack in the ground (in this case, to the south of Mt. Kare running parallel and along Mt Kare’s length in an East West direction.
But in 3D the NDF is actually a plane running East West and, maybe, at 70 degrees sub-horizontal, sloping downward to the North.
Out and along and down this fault, from the C9 and Central Zone breccia pipes BMCF’s have laterally travelled to the WRZ (one of Kare’s “petals”).
The presence of low grade base metal carbonate style gold in the WRZ is explicable on this basis.
However throughout the WRZ we also find hugely rich bonanza style Roscolite suggesting a subsequent and later stages of mineralization along this same plane with much cooler diluted waters rich in gold confirming the formation of a secondary process of mixing of BMCF’s and surface waters.
Likewise, as the radial faulting has progressed over the last 6,000,000 years (intrusive rises) the NDF has provided a mechanism for secondary enrichment around and out and along the intersection of the NDF and the C9 and Central Zone breccia additionally along the listric faulting inward.
What I am saying is that very little if any of the work done by Madison and Buffalo focused and the big picture with Kare.
The challenge now is to explore for the gold along these faults where zones of Roscolite formations should be.
Suspect the gold in the land slippage is merely the tip of the iceberg and merely confirms the existence of massive high grade mineralization below the mountain on-strike from the WRZ through to the BZ.