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thegoldgopher
20:34:31 Sun
Apr 22 2012

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Black sand needed, and black sand questions

I need a bunch of black sand. Anyone have a bunch they want to part with?

Is all black sand reactive to a magnet? I have seen some recent videos of people playing with black sand and magnets. I have not seen a lot of magnets in sluices to grab the black sand, but think it would be a good idea, just removing one more thing from the desired result. It could all be saved for refining. They seem to leave a lot of the sand in with the gold. Is this because there is a tiny amount of gold in with the black sand that comes out in smelting?

can be contacted at thegoldgopher@gmail.com re: black sand

  
azkid
06:41:07 Mon
Apr 23 2012

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Re: Black sand needed, and black sand questions

there was a gold fever episode a few years ago the guy had a magnet covered in PVC at the head of his sluice that came out pretty easily and he reworked the black sands.. there are also one that adapt to sluice boxes..

also I do believe that not all black sands are magnetic there are some non magnetic also depends on the geologoy of the area you are in.

  
leonard
15:57:33 Mon
Apr 23 2012

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Re: Black sand needed, and black sand questions

Most of you may have seen it before but for the newbies, http://golddredgervideo.com/alaska2008/cleanupmusicvideo.wmv shows a commercial operation clean up.

The first few minutes is removing the magnetics. Tobie kept the removed black sand as there still was gold in it and he reworked it later. Most of what was left that he pans was cassiterite http://en.wikipedia.org/wiki/Cassiterite that he used as a jigging material as it's specific gravity is about 7. He purchased it locally where it came from http://econgeol.geoscienceworld.org/content/56/1/213.abstract

Leonard

  
dragline
21:46:31 Mon
Apr 23 2012

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Re: Black sand needed, and black sand questions

Here is another Wiki article on the subject of mineral sands...
http://en.wikipedia.org/wiki/ilmenite

From this article the distribution of components are typically...

    Zircon, from 1% of THM to upwards of 50% of THM,
    Ilmenite, generally of 10% to 60% of THM
    Rutile, from 5% to 25% of THM
    Leucoxene, from 1% to 10% of THM


Of course any specific area can have very different characteristic mineral sands including hematite which I don't see among the minerals listed on the Wiki page above...
http://en.wikipedia.org/wiki/Hematite

Here are some interesting fact sheets on mineral sand mining industry...
Western Australia Mineral Sands Fact Sheet (PDF)
Mineral Sands: An Overview of the Industry (PDF)

This second PDF above has a very good introduction to the Geology of marine mineral sand deposit formation. In areas like the Gulf of Alaska the mineral beach sands are typically reddish in color owing to the high garnet content. The ore bodies associated with mineral sand beach deposits are sometimes referred to as lenses owing to the lenticular shape of these ore bodies ranging in thickness from a few millimeters to in some cases a few feet. Beach mineral sands are typically deposited during the heaviest Winter storms and on some beaches can yield significant gold recovery.

dragline
[1 edits; Last edit by dragline at 22:56:55 Mon Apr 23 2012]

  

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