New Found Gold Corp V.NFG

Swan and Eagle Zones at Fosterville

[megacopper]

Great geological information on the Swan and Eagle Zones at Fosterville below. Looks as if the best of the Eagle Zone was at a depth of 750 meters. They also talk about the importance of antimony with these high grade zones and of course there is extensive antimony mineralization at Queensway. I often think back to what the Rock Doctors buddy said about the Beaver Brook Antimony mine adjacent to the Queensway South property. He was a geologist there for a short period back in the mid nineties and he kept saying he didn't understand why they (Royce Field Resources at the time) weren't going after all the gold that was showing up in the assays at that Antimony mine. I think the Queensway South property will be spectacular. Just my own thoughts because I think the Antimony plays a large part in this discovery somehow and it's no coincidence that the richest gold zones at Fosterville have a lot of antimony similar to Queensway. 

https://www.portergeo.com.au/database/mineinfo-mb.asp?mineid=mn230


A primary visible gold event variably overprints sulphide mineralisation and occurs in quartz-carbonate veins ±stibnite. Cross-cutting relationships indicate visible gold and stibnite-quartz veining post-dates disseminated arsenopyrite-pyrite mineralisation. Although it has been encountered in all parts of the underground workings and in some open pits, visible gold apparently increases noticeably with depth and represents a change in the nature of the Fosterville mineralisation. The best example is the Eagle Zone, an east dipping splay of the Phoenix Fault at a depth of >750 m below surface. The Eagle Fault is discordant to bedding and variably dips between 10 and 60°E, transforming further to the south to strike in an ENE direction, dipping ~45°SSE. The Eagle Zone is 0.5 to 6 m thick, 50 to 80 m wide down dip and persists for >700 m down plunge. There is a substantial increase in visible gold content in the Eagle zone below 800 m depth, where the average gold grade is 15 g/t Au, although individual assays of >1% Au are encountered (Fuller and Hann, 2019). Visible gold is thought to contribute ~40% of the contained gold in this zone (Hitchman et al., 2017; Fuller and Hann, 2019). 

 

Had to delete the image due to stockhouse. Now they don't want us posting pics of rocks. Like WTF

Visible gold and antimony mineralisation is also strongly developed in the footwall to the Lower Phoenix Fault and its down dip continuation, the Benu Fault, occurring as the SW-dipping Swan (previously the Lower Phoenix Footwall) Zone, which occupies a structurally rotated reverse fault splay. The Swan Fault obliquely cross-cuts the western limb of a parasitic anticline and is bounded by the Eagle Fault down-dip and the Kestrel Syncline at its upper margin. It is characterised by a 1 to 3 m thick quartz vein with various textural features. These include unique spotted stibnite and visible gold within quartz, zones of brecciation, included country rock blocks and stibnite laminations (particularly concentrated on vein margins), styolitic textures with concentrated trends of visible gold, vugs containing euhedral crystalline quartz ±sulphides and visible gold, sugary cryptocrystalline quartz textures and massive quartz zones containing specs and slugs of visible gold. On its periphery there is a lower-grade wall-rock selvage of sulphide disseminated gold mineralisation which can be up to 2 m in true width (from Fuller and Hann

[Retiredgeo]

When gold precipitates in a low temperature epithermal environment it precipitates alongside other low temperature epithermal minerals such as Stibnite (Sb), Boulangerite (Sb), Realgar (As), Orpiment (As), Cinnabar (Hg) and Adularia (K).  These minerals are more abundant than the gold and can be considered pathfinders for the gold.  Many are brightly coloured or otherwise distinctive

[cyberman]

hi Retiredgeo, so does that mean we're stuck with marine siliciclastic sedimentary rocks, schist, gneiss and migmatite ? also, is the rumour true that most Geologists have rocks in their heads ? hehehe best to you in retirement, and thanks.

[Retiredgeo]

No rock is stable under surface conditions.  Rocks fragment into sand, silt and clay which eventually forms layers, either on land or underwater.  If the rock was mostly quartz and feldspar it forms siliclastic sediment which can get buried and squeezed into siliclastic sedimentary rock. If you cook that rock under heat and pressure it turns into a slate than a phyllite then a schist

[cyberman]

thanks R-geo, agree, agree, agree. sorry for my limited scope on this but doesn't the whole Claim makeup predetermine the potential for quartz-carbonate veins to exist ? (and having them at surface and near-surface doesn't hurt either LOL). again thanks for sharing your expertise.

[Retiredgeo]

From a chemistry standpoint "none what so ever".  The gold came from very deep down from rocks which are not exposed at the surface.  Think of the Quartz-carbonate veins as the highways and the surrounding country rock as the scenery.  It is rather irrelevant what scenery the highways cut through.  Traffic down the highways came from far far away. There are examples

[Gangsterme]

Correct me if I am wrong. Nobody knows how close  or far from surface the gold intruded. Also, we have no idea how much has been eroded over the many years. Fosterville  has higrade at depth, the higrade for NFG might be near surface as 100's of meters of rock have been displaced. We are all speculating and if we knew the answers there would be no need to drill. We are all antsy to

[Retiredgeo]

I strongly recommend watching the video "Mega Epizonal deposits Part 1".  I strongly recommend watching all four videos. The Appleton fault is an orogenic fault created during or shortly after the collision of North America and Europe some 430 million years ago.  These faults are very deep and it is generally believed that the gold bearing fluids came from very deep down