Hi everyone.
I’m bumping this thread so as to link the press story below into the most recent company report on Glenburgh.
Although Gascoyne Resources is mentioned, the story it mainly an overview of geology in the Glenburgh area.
As to GCY announcement of August 2, 2018 high grade good findings at Glenburgh:
Given the geology it does seem possible the results are accurate aand I remember when the capital raising previous to the most recent one was done there was a bank requirement to keep up intensive exploration ( now revised while the hatches are battened and GCY struggles to stay afloat).
Still, given the disappointment with Golden Wings not living up to its promises*, I think reasonable concerns about the veracity of the Glenburgh findings are warranted until further drilling is done.
(*ie ‘significant’ results at Golden Wings announced by Mike Dunbar in 2016 created an expectation the Golden Wings pit woukd provide around 15% of current gold production. However, as s I understand, working the pit has so far led to near zero gold , delays and further spending to try to resolve the problem (we should be hearing back this month from the second set of experts called in to see if it can be turned around.).
But the geology around the proposed Glenburgh mine
does seem ok :
Cheers
https://thewest.com.au/news/midwest-times/dig-into-past-reveals-golden-nugget-ng-b881020777z
Dig into past reveals golden nugget
Geoff VivianMidwest Times
Friday, 21 December 2018 11:05AM
A geologist sits on the exposed roots of a former mountain range that has eroded away over two billion years at Glenburgh.Picture: Geological Survey of Western Australia
Exploration company Gascoyne Resources is preparing to develop a gold deposit estimated at one million ounces east of Carnarvon.
Government geologists detected this treasure trove while investigating events that took place more than two billion years ago at what is now Glenburgh Station in the Gascoyne.
The WA Government’s chief geoscientist Simon Johnson said present-day Glenburgh was once covered by a great mountain range like the Himalayas.
“Over billions of years since, those mountains have eroded down to be flat again,” he said.
“So when you walk over the surface you are looking at the deep exposed roots of that mountain chain.”
Dr Johnson said the mountains started to form when the Earth’s surface had already cooled enough to form a solid crust, partly covered by oceans and divided into many tectonic plates.
One of these was a “micro-continent” now called the Glenburgh Terrane that geologists had thought to be about the size of present-day Japan.
However Dr Johnson said during the past three years his team had learned it was much smaller and triangular in shape.
“It is widest in the west and extends from Glenburgh Station to approximately where Barradale roadhouse is,” he said.
“Further east it narrows down to a thin wedge, and by the time you get to Great Northern Highway it disappears.”
Dr Johnson said this tiny continent collided gently with a much larger tectonic plate called the Pilbara Craton about 2.2 billion years ago.
The edge of the large tectonic plate was forced under the edge of the smaller one, pushing it up to form a low mountain range like the mountains of Alaska or the islands of Indonesia.
Geologists looking over Mt Anderson about 10km south of Nanutarra Roadhouse.
“There is a lot of gold in places like Alaska, Indonesia and New Zealand,” Dr Johnson said.
“From our dating, we can say the gold formed within a 40 million- year window.”
What happened next was a more violent event when another large tectonic plate called the Yilgarn Craton collided with these young mountains 200 million years later.
Once again, the edge of the larger plate disappeared under the edge of the smaller one, pushing it up to a great height just as India is presently pushing up the Himalayas.
While the Glenburgh Terrane still contains perhaps one million ounces of gold, Dr Johnson said it may have held 10 times as much before this second collision.
“Those rocks were smashed by the Yilgarn Craton coming in,” he said.
“During that collision, whatever deposit was already there got heated, squashed, moved around and we lost maybe 90 million ounces of gold.”
Dr Johnson said they gained the latest information using a passive seismic made up of 60 individual seismometers all spaced about 40km apart.
“Together, by recording the vibrations from distant earthquakes, they acted like a telescope like the Square Kilometre Array,” he said.
“Instead of looking up, they looked down, deep into the Earth’s crust and upper mantle.”
The discovery represents 12 years of work by the Geological Survey of Western Australia, which is now part of the Department of Mines, Industry Regulation and Safety.”
