This is what Krum posted previously Post #: 35052038Let us know...

This is what Krum posted previously Post #: 35052038

Let us know what you think about this geological explanation and whether this may similar to the thinking of QH.

"The Walhalla to Wood Point and further north gold field is a narrow, long field that was generated by the buckling of flat lying sediments due to continental plate collisions that built the Snowy Mountains and the Great Dividing Range. When those sediments buckled up into mountains and valleys they fractured vertically at every anticline and syncline.

Also, when those sedimentary rocks buckle, they thicken at the bends (Anticlines and synclines) and thin along the limbs and this is also accentuated within differing layers due to their differing hardnesses such that some layers slip and thicken more than others.

These cracks down the bends go tens of kilometers almost vertically to ultimately allow fluids and magma to penetrate upwards. Ongoing strata movement allows the Dyke material to penetrate and form the dykes. Generally the anticlines and synclines form a regular pattern north to south because the folds are relatively regular to a first order of magnitude.

These dykes are much harder than the broken sedimentary rocks that they penetrated, a bit like a steel rod in sand.

Further continental movement and stresses then cause fractures in the Dykes and like all rock they break under tensile forces. Even when put under compression, rock breaks under tension due to the internal grain boundaries sliding past each other and they pretty well always break at near 30 and 60 degree angles. This happens in all intrusive related systems around the pacific ring of fire mountain ranges whether or not the intrusions are vertical or horizontal.

Water ultimately finds its way down the vertical fractures and due to chemical interactions with the melt deep below, metallic fluids rise into the fissures between the dykes and the sediments and ultimately into the dyke fractures. Generally the base metals precipitate out first with precious metals dropping out higher in the sequence (hence many gold fields will have deep base metals).

Now, the dykes generally have bulges and necks due to the different sedimentary layers and depending on post emplacement erosion either the bulges or the necks are found at surface by prospectors.

Also, due to historic mining knowledge we know that the higher grade gold preferentially deposits on the hanging wall of the bulges. This makes sense because metals preferentially precipitate out of hot fluids due to a change, be that either temperature drop, or pH change, or turning a corner (slows down) etc.

So there are probably a hundred dykes, most daylighted, some are now at a bulge or a neck but all are currently daylighted and most have been found and even mined to some depth. The Bulges became the main mines whereas the necks did not. The bulges that carried good gold became the 3 or 4 deep mines because they could pay for deep development including pumping water, the others did not.

THIS DOES NOT MEAN THAT THE MINES THAT DID NOT GO DEEP ARE NOT POTENTIALLY ECONOMIC. IN FACT IT SUGGESTS THE OPPOSITE.

SO, just as GMA did, we should first use geophysics to define the location and shape of all the Dykes, then throw 2 or 3 deepish holes down the best looking ones, and not 1km deep like GMA had to do at Mstar, but 300m deep - why - because the average bulge depth is 300m.

So, I say, every one of the Dykes has high potential to be a big mine with the same gold distribution as Walhalla, Mstar and A1, but we just need to find the bulges.

The old timers left the necks but the necks will be just above the Bulges."