Some reading while we wait
posted on
Jun 23, 2008 07:22AM
Focused on becoming a near-term Gold Producer
Stumbled across this today, though it was worth posting. While it's a tad on the peculiar side, I realize I'm probably spending too much time reading up on geology when I dream about it...LOL. But seriously, I dreamt the words "chlorite" and "Depletion" so I googled them and this is what I found.
Here's a link to another company in the area. I have no idea what they trade at, etc, because I only stumbled across their geologic interpretation of the area. It's written very well, easy to follow, and offers some insights into what we could be looking at with Sage. As always, your comments are welcome!
http://www.trilliumnorth.com/html/pr...
Here's a couple of highlights from it: ( and I am particularly encouraged by the similarities we share with it, exhalites, cherts, Cu-Au, and on it goes...)
It is a well known fact that VMS camps such as Noranda, Mattagami, Thomson-Bouquet, Kamiskotia-Kidd Creek and Flin Flon, all contain numerous small massive sulphide bodies 500,000 - 6,000,000 tonne deposits as well as larger 12 - 15 million tonne bodies and often very large deposits of 50 - 200 million tonnes. This means you have clusters of smaller deposits surrounding the larger ore bodies. The small deposits can be found in pods 100 m in length but even the large deposits can be located in a 150 m length on surface.
When the volcanic rocks are folded and deformed by shearing, the alteration can become separated from the main body of sulphides, displaced to the side. The chert horizon.can be folded and faulted into segments however the original deposit can remain intact and can be stretched along a fold axis to form plunging lenses. Intrusions such as gabbro bodies can sometimes form a cap to dam fluids thereby preventing them from reaching the sea floor, thus forming sulphide bodies beneath the gabbro. Younger gabbro intrusions can tear away part of a massive sulphide leaving the main body within the volcanics. A gabbro body at Vanguard may have played these roles as a gabbro intrusion separates the 100,000 tonne East Zone from the 200,000 tonne West Zone.
And lastly, some interesting insight as it relates to airborne EM surveys and target detection.
Helicopter time domain EM surveys were flown in February 2003 which outlined 11 new conductors not previously detected by older surveys including the West Vanguard Cu-Zn deposit. A 450 km time domain helicopter-borne EM survey was flown over the entire claim group in February 2003, with lines at 50 m spacing over the West and East Vanguard deposits, and at 100 m intervals for a 10 km long section of the property and at 150 m intervals on the western area covering the rhyolite pile. Of the eleven new conductors identified by this survey, that had not been located by conventional EM surveys in the past, one of these was a large one over the West Vanguard zone. This new EM system called Dreamcatcher has a wide spectrum of detection capability as well as the ability to penetrate to depths in excess of 300 m. If old fixed wing aircraft-borne EM surveys could penetrate 75m, then the question arises, "One can understand how the new survey might pick up the deeper copper sulphide (chalcopyrite) zones and pyrite (massive sulphide) phases which are conductive, but the West Vanguard zone comes right to surface, why wasn�t it picked up by the old surveys?" The low conductivity of the Vanguard zone is due to carbonate and silica alteration that insulates the sulphides and renders them poor conductors. Sphalerite (zinc sulphide) is not a conductor and therefore also insulates. The shape of the zones also made them difficult to detect since they are plunging lenses and had individual short strike lengths. This led to the erroneous conclusion that the two zones were isolated small high grade pods at surface. Drilling on the East Vanguard Zone detailed below has also dispelled the belief that the mineralization does not continue to depth.
Quack