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Green plastic bags on the gold fields - what are they and what do they hold?

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Green plastic bags on the gold fields - what are they and what do they hold? Empty Green plastic bags on the gold fields - what are they and what do they hold?

Post  Peta on Fri Oct 09, 2020 1:28 am

I have noticed green plastic bags full of soil etc on many of the gold fields that we have visited.
Some are sound whilst some have burst spilling the contents.

What are these bags, what do they contain and what do they do with them?

Peter.

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Post  Nightjar on Fri Oct 09, 2020 11:22 am

Good morning Peter,
They are drilling samples, you may see a lengths of black poly pipe protruding from the ground, these have concrete plugs attached blocking off the holes. Plugging drill holes became mandatory after it was proven that our bush creatures were being lost down the drill holes.
Rule of thumb each sample bag represents one metre depth of drilling.


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Post  adrian ss on Fri Oct 09, 2020 12:38 pm

Pan off a few, might be gold in them thar bags. Laughing Laughing Laughing
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Post  Dozer on Fri Oct 09, 2020 3:34 pm

Hi Peta
As Nightjar explained they are the samples from drilling. Generally speaking they will be from RC drilling and will contain soil and powdered rock in the oxidised(or upper) zones and rock chips when the drill is in fresh rock. They are lined up in a sequence alongside the drillhole and are meant to be removed when the area is rehabilitated within 6 months. (In West Australia anyway) This used to be ignored all the time but these days the Mines Dept, are issuing fines to those who don't do the rehab on time. $100K or more!!
The rehab has been one of my jobs recently and disposing of the plastic from the decaying bags is a PITA.  A lot of companies are moving to piles of material and not using the plastic bags. Much easier to clean up.

As an aside, out in the desert country camels make a mess of the piles and also the bags. They like to rub their bellies over the piles as it is often coarse and scratches the parasites off. It makes it really difficult when doing a re-sampling exercise.

A lot of holes are now plugged with the orange plastic cones you see lying around, and the backfilled. The black poly pipes and concrete plugs are not used much at all now. Often we will place a nut or large washer in the cones and use a 7000 if we have to locate a drillhole for any reason. All drillholes are DGPS located before rehab so the location is not hard to find.

As for panning the dirt, good luck. The bags are nominally a 20kg sample so a hit of 100 grams per ton(gpt) will give you a whole 2 grams from a bag. Most bags will be 5gpt or less. Also we usually remove any bags that are carrying good grades.


Last edited by Dozer on Fri Oct 09, 2020 3:37 pm; edited 2 times in total (Reason for editing : spelling duh!!)

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Post  adrian ss on Sat Oct 10, 2020 7:37 am

So that is approx 160 bucks per bag. bounce
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Post  moredeep on Sat Oct 10, 2020 10:08 am

minus 15% for scrap gold,minus petrol/food /operating cost money to get there.
Time to process each bag,you're probably working on about 10 bucks per hour pay affraid  Q34


cheers  moredeep
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Post  davsgold on Sat Oct 10, 2020 11:09 am

moredeep wrote:minus 15% for scrap gold,minus petrol/food /operating cost money to get there.
Time to process each bag,you're probably working on about 10 bucks per hour pay affraid  Q34


cheers  moredeep

and that's on one or two bags out of say 300 from a single drill hole, you would be luck to get the 2 grams in a month of panning just to find the couple of bags which actually had gold in them.

Of course if you were lucky enough to read the drilling report and work out which bags at what depth showed good assay results you might get 2 grams for the day. Very Happy

cheers dave
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Post  adrian ss on Sat Oct 10, 2020 3:12 pm

Going by my gold recovery rate per gram per day over the past 49 years, Sounds about the same odds of my finding gold anywhere. Laughing Laughing
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Post  Peta on Sat Oct 10, 2020 10:00 pm

Thank you to all for your informative replies.

Peter.

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