northwest Is this true in general?
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australian electronic gold prospecting forum.com  |  Geology and occurrence of gold deposits  |  Gold deposits  |  Gold in Victoria  |  Topic: Is this true in general? 0 Members and 1 Guest are viewing this topic. « previous next »
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Doug
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« on: Friday January 11 2019 13:53:25 AEDT PM »

 The late Jim Stewart  told me on many occasions that the richest gullies in the golden triangle were those that tended east.He said that for searching  virgin ground that efforts should be mainly  focused. in the east side of known reef lines.For tertiary Pliocene deposits different considerations should apply but did not go into specifics. So as a general principle  is what he said a sound prospecting strategy for the golden triangle?
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« Reply #1 on: Friday January 11 2019 15:47:39 AEDT PM »

Bit of a tricky question this one. I had to stop and think about the various situations that I have encountered over the years, and upon doing so I can only conclude that many situations are the opposite.
Firstly you have to be certain that the gold that you detect has come from a specific reef system. This is often not easy, or even possible. Where a  worked reef is proven, the colluvial traces of gold forming leads into gullies is obvious, and yes, you can speculate that the gold is traveling from the mostly north south reef line in an either east or west direction. Where a reef is running along one side of a north tending slope, then the gold will of course shed down hill, but where a reef outcrops along the peak of a ridge another important factor comes into play, which is the dip of the reef. Some reefs are practically vertical while others dip at various angles. The greater the angle of dip the more positive you can be in regard to the direction of shedding. Should the reef show a positive dip to the east, then the shed will be westerly. Imagine the reef extending into mid air, and consider where the gold would have been deposited as the reef eroded and broke down. This is very handy when a reef is on relatively flat country.
There are a number of big, rich, and extensively worked reef systems that have shed in both east and west directions at different points along their length. Some of these lines run for many kilometers and 'make' intermittently. I have had some good results over the years chasing and extending these lines.
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« Reply #2 on: Friday January 11 2019 15:57:05 AEDT PM »

  
Bit of a tricky question this one. I had to stop and think about the various situations that I have encountered over the years, and upon doing so I can only conclude that many situations are the opposite.
Firstly you have to be certain that the gold that you detect has come from a specific reef system. This is often not easy, or even possible. Where a  worked reef is proven, the colluvial traces of gold forming leads into gullies is obvious, and yes, you can speculate that the gold is traveling from the mostly north south reef line in an either east or west direction. Where a reef is running along one side of a north tending slope, then the gold will of course shed down hill, but where a reef outcrops along the peak of a ridge another important factor comes into play, which is the dip of the reef. Some reefs are practically vertical while others dip at various angles. The greater the angle of dip the more positive you can be in regard to the direction of shedding. Should the reef show a positive dip to the east, then the shed will be westerly. Imagine the reef extending into mid air, and consider where the gold would have been deposited as the reef eroded and broke down. This is very handy when a reef is on relatively flat country.
There are a number of big, rich, and extensively worked reef systems that have shed in both east and west directions at different points along their length. Some of these lines run for many kilometers and 'make' intermittently. I have had some good results over the years chasing and extending these lines.

Of course an obvious exception to this would of course be the Rushworth field. But from your experience do many of most productive reefs in the GT dip to East or west?
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« Reply #3 on: Friday January 11 2019 16:28:11 AEDT PM »

I reckon it's a mixed bag Doug.
Let's have a look at some of the big powerful ones.
Arguably the most powerful line is the one that I refer to as the 'Welcome Stranger' line. It begins at roughly the 'Hit or Miss' mine north west of Wedderburn, where it shed east, continues to Stirling rush, just west of Wedderburn, where it shed west, and then disappears until further south reappearing at Whela, shedding both east and west along the continuing course. A small shedding at O'Briens dam westerly, on to Condens lead where it also shed west, then Parson Smith's reef for an easterly shedding before turning up at the Bulldog reef where it shed the Welcome Stranger nugget slightly west. Following the line south again it shed mainly to the east into the Inkerman lead until Goldsborough where it takes a large cross fault to the east. Following it further is difficult, although I have an idea where it goes, but not a hundred percent sure as it hits granite and is gone.

The Woolshed reef at Poseiden produced leads running both east and west.
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« Reply #4 on: Friday January 11 2019 16:57:31 AEDT PM »

  
I reckon it's a mixed bag Doug.
Let's have a look at some of the big powerful ones.
Arguably the most powerful line is the one that I refer to as the 'Welcome Stranger' line. It begins at roughly the 'Hit or Miss' mine north west of Wedderburn, where it shed east, continues to Stirling rush, just west of Wedderburn, where it shed west, and then disappears until further south reappearing at Whela, shedding both east and west along the continuing course. A small shedding at O'Briens dam westerly, on to Condens lead where it also shed west, then Parson Smith's reef for an easterly shedding before turning up at the Bulldog reef where it shed the Welcome Stranger nugget slightly west. Following the line south again it shed mainly to the east into the Inkerman lead until Goldsborough where it takes a large cross fault to the east. Following it further is difficult, although I have an idea where it goes, but not a hundred percent sure as it hits granite and is gone.

The Woolshed reef at Poseiden produced leads running both east and west.

Gravitional pull by magnetic forces as well as faults determine where a good reef sheds.
Where gold reefs once were and have eroded to nothing sees the gold spread far and wide over time.
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« Reply #5 on: Friday January 11 2019 17:20:29 AEDT PM »

  
I reckon it's a mixed bag Doug.
Let's have a look at some of the big powerful ones.
Arguably the most powerful line is the one that I refer to as the 'Welcome Stranger' line. It begins at roughly the 'Hit or Miss' mine north west of Wedderburn, where it shed east, continues to Stirling rush, just west of Wedderburn, where it shed west, and then disappears until further south reappearing at Whela, shedding both east and west along the continuing course. A small shedding at O'Briens dam westerly, on to Condens lead where it also shed west, then Parson Smith's reef for an easterly shedding before turning up at the Bulldog reef where it shed the Welcome Stranger nugget slightly west. Following the line south again it shed mainly to the east into the Inkerman lead until Goldsborough where it takes a large cross fault to the east. Following it further is difficult, although I have an idea where it goes, but not a hundred percent sure as it hits granite and is gone.

The Woolshed reef at Poseiden produced leads running both east and west.

The origin of some GT gold nuggets is a mystery eg where did the nuggets at John;s Paddock Rheola come from?
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« Reply #6 on: Sunday January 13 2019 14:07:45 AEDT PM »

Best geological explanation for the Rheola, Moliagul and Kingower giant nugget fields is the emplacement of three plutons in close proximity, namely the Kooyoora adamellite, Moliagul and Tarnagulla granodiorite.

As these structures pushed their way up through the Ordovician sediment during the Devonian epoch, they remobilised the high percentage of gold contained therein via quartz reefs. As these in turn eroded during the Tertiary (a time of massive rainfall) the resultant large nuggets were deposited in fast flowing streams draining (and rapidly eroding) the newly formed granite mountains.

Today, with the exception of Mt Kooyoora and Mt Moliagul (both mere shadow of their former selves) the landscape has comparatively levelled off leaving the nuggets lying along the former drain lines of those once mighty whitewater rivers.

Whenever I try to reconstruct an alluvial field, I always bear in mind that its gold journey began maybe hundreds of feet overhead, gravity did the rest.  smile
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