northwest My Avoca Alluvial gold project 1991
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australian electronic gold prospecting forum.com  |  Common interest forum.  |  General chat and discussion forum  |  Panning and alluvial gold recovery, Geology, Geochemistry of Placer and Alluvial gold deposits  |  Topic: My Avoca Alluvial gold project 1991 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: My Avoca Alluvial gold project 1991  (Read 1392 times)
Doug
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« on: Saturday January 28 2012 15:43:03 AEDT PM »

 I will upload some pictures to show you some bulk sampling and the costeans,the plant etc.
doug smile
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« Reply #1 on: Saturday January 28 2012 15:48:47 AEDT PM »

Avoca2
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« Reply #2 on: Saturday January 28 2012 15:54:18 AEDT PM »

Avoca 3
A section of one of  the 100m wide the costeans.The wash dirt is the darker colored material exposed in the wall of the costean  just above the bed rock.
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« Reply #3 on: Saturday January 28 2012 16:05:29 AEDT PM »

Avoca4
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« Reply #4 on: Saturday January 28 2012 16:23:38 AEDT PM »

avoca 5
The project consultant geologist supervising the  digging of a costean and in this shot the digging out of the wash dirt (dark color) to make sure that  all the wash dirt + a few inches of bed rock was loaded onto the truck to be taken to the plant. The bottom of the lead was very undulating in places somewhat like a egg carton which made sampling more difficult.In some places the gradient of the lead was also reversed shocked ie it was decreasing as we progressed down the lead! Their was also some evidence of small waterfalls and rapids.  In the best areas the old timers had scraped the bedrock with their picks and you could still see these marks!In these places a lot of the wash had  been removed although pillars remained between the holes and they may have only taken 6"-12" or wash when the wash was up to 3 feet thick. In one costean their was a false bottom which sadly fooled even the geologist  and it was only when the operation was coming to an end that I discovered this and the rich gold under this false bottom which sadly we never mined. sad1
Notice the size of some of the boulders! We uncovered some much bigger ones in some test pits and another costean!
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« Reply #5 on: Saturday January 28 2012 16:34:17 AEDT PM »

 Avoca6
A costean in the shallower, upper portion of the lead.The top of the very iron stained wash dirt is clearly visible as is the presence of sub angular quartz/ironstone in the wash.You can see an old diggers hole in the wall of the costean and the removal of some wash dirt directly below it.
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« Reply #6 on: Saturday January 28 2012 18:29:29 AEDT PM »

Quote

Avoca 3
A section of one of  the 100m wide the costeans.
The wash dirt is the darker colored material exposed in the wall of the costean just above the bed rock.
doug



 wow!    Clap Hands Clap Hands

Great Pics Doug!!   Like they meant to say .......  "a dozen pics says a thousand words!!"

Do you mean the costean was  1 m wide  x 100 m long??

I would be douwn their hand "sampling" as well into buckets!

 thanks
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« Reply #7 on: Saturday January 28 2012 18:56:34 AEDT PM »

  
Quote

Avoca 3
A section of one of  the 100m wide the costeans.
The wash dirt is the darker colored material exposed in the wall of the costean just above the bed rock.
doug



 wow!    Clap Hands Clap Hands

Great Pics Doug!!   Like they meant to say .......  "a dozen pics says a thousand words!!"

Do you mean the costean was  1 m wide  x 100 m long??

I would be douwn their hand "sampling" as well into buckets!

 thanks

Yes 4x 100 x1m  costeans=approx 600 bcm(bank cubic meters) then 5x5 =25,000 bcm test pits, then mine! Average recovered grade was .36 grms/bcm. Could have been and should have been over .4 grm/bcm! Had our JV partners not stuffed up and gone in receivership then I would be wealthy man today! Some reefs containing visible gold were uncovered during mining but still remain untouched today!!!!! sad1 More pics to come!
doug smile

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« Reply #8 on: Saturday January 28 2012 22:35:33 AEDT PM »

Avoca7
Some typical Avoca lead diggings in  the deeper ground (costean4) looking east.
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« Reply #9 on: Saturday January 28 2012 22:47:00 AEDT PM »

Avoca 8
A close up of the washdirt exposed in costean 4.Note the lighter colored ,soft,whitish slate bottom in the middle of the picture which is was  usually favorable for higher gold grades (good gold trap with crevices and cracks and a decrease in stream velocity or gradient change which drops gold ) compared to a smoother sandstone bottom where the grades were usually very poor because of the absence of good gold traps.The exception was where a vein or leader crossed the lead in the sandstone bottom.
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« Reply #10 on: Wednesday September 10 2014 10:29:45 AEST AM »

Hey Doug, new member here, nice post! I am currently looking for land to buy in Central Goldfields on heavy old workings. When we dig test pits we are finding that the amazing looking decomposed stained quartz on the surface only goes down about 400mm, then we strike 3m plus of red and white pipe clay. Were the old boys going deeper than this? We sometimes find a thin band (300mm) of rough jagged material similar to that on the surface at about 3.5m depth, but no tumbled pebbles.

Just to guage the scale on the Avocca photos - how deep is that wash layer underground, and what is the depth of the actual wash layer itself? Was the clay above it any good at all, or only the wash layer? Did you find tumbled pebbles in the wash, or jagged like on the surface in these areas?

Cheers,
WestOstrich!
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Doug
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« Reply #11 on: Saturday June 20 2015 16:56:34 AEST PM »

  
Hey Doug, new member here, nice post! I am currently looking for land to buy in Central Goldfields on heavy old workings. When we dig test pits we are finding that the amazing looking decomposed stained quartz on the surface only goes down about 400mm, then we strike 3m plus of red and white pipe clay. Were the old boys going deeper than this? We sometimes find a thin band (300mm) of rough jagged material similar to that on the surface at about 3.5m depth, but no tumbled pebbles.

Just to guage the scale on the Avocca photos - how deep is that wash layer underground, and what is the depth of the actual wash layer itself? Was the clay above it any good at all, or only the wash layer? Did you find tumbled pebbles in the wash, or jagged like on the surface in these areas?

Cheers,
WestOstrich!

The wash varied in depth from about 2 meters in shallower ground on the s portion of the lease to over 7m in the n portion. In the deeper ground some false bottoms were  also encounted. Most of the best gold was only in the wash and in fractures and cracks in slate bedrock and the old timers in many places  only removed about 6"-12" of wash and on slate bottoms 2"- 3" of basement. The wash contained both angular and water worn quartz.Some of the quartz boulders were up to nearly 3 feet in diameter! The gold was also very varied in character from smooth to quite hacky and  angular.The hacky and rough gold was probably derived from reefs and leaders on  rising ground on the east of the lease and from at least one reef  found in the lead basement which was never properly tested for grade but did contain some visible gold.
Sorry for the long delay in response!
doug smile
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australian electronic gold prospecting forum.com  |  Common interest forum.  |  General chat and discussion forum  |  Panning and alluvial gold recovery, Geology, Geochemistry of Placer and Alluvial gold deposits  |  Topic: My Avoca Alluvial gold project 1991 « previous next »
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