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Recycling gold from scrap PC boards 2003. I am electrochemical engineer, with years of electroplating experience. A friend of mine wants to recycle gold from PC boards contacts. He has some 100 kg, or so. I would like to help him and set up the process for him.
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» Characteristics of Gold
Iridium (one of the platinum group metals) is one of few metals that have a higher specific gravity than gold, being 22.6. Gold is around 8 times heavier than the quartz rock which it is commonly associated with when gold is found in hardrock form. A single cubic foot of gold …
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Gold: The mineral native Gold information and pictures
Gold in its natural mineral form almost always has traces of silver, and may also contain traces of copper and iron. A Gold nugget is usually 70 to 95 percent gold, and the remainder mostly silver. The color of pure Gold is bright golden yellow, but the greater the silver content, the whiter its color is.
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Mar 13, 2018· Pulverize the rock by crushing it with a heavy mallet first, making certain to contain the bits. Put the material at the top of a sluice box and add water to push the rock down the slightly angled ridged slide. Gold typically collects within the ridges. Another option is to pan the pulverized rock to remove the rock from the pan and leave the gold.
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Earth's gold and platinum arrived in a meteor shower ...
Sep 07, 2011· The world's gold and platinum came from outer space after a mammoth meteorite shower battered the Earth four billion years ago, Bristol University scientists reveal. ... Rock …
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Unlike alluvial gold, which is found as very small flakes on riverbanks, gold-bearing rocks have to be dug out of the ground. We're after pure gold, but rock that contains gold also includes lots ...
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May 06, 2018· Heavily mineralized rock grab samples found on an old logging road. Decent result for gold, silver, platinum, palladium and copper found from assays. The area has mass amounts of …
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Getting Gold and Silver Out of Rocks - History of Bodie, California. After miners broke mineral-bearing ore from the surrounding rock and ... When washed in water, gold, silver sulphurets, and rock particles that contain them, tend ... Their aversion to mercury complicated removing them from crushed ore, and... More details » Get Price
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Platinum and Gold Natural Crystals, platinum and gold nuggets …. The gold is formed in a mossy crystalline pattern on the surface of the rock. …Most raw platinum is also mined as microscopic particles. »More detailed
How to Test Ore or Rock for Gold Content
How to Easily Test/Determine of rocks contain gold: This may be made by putting about an ounce of gold-and-silver-free mercury in a small stoppered bottle and adding the heavy material from the pan with a little water, and agitating violently for 5 or 10 minutes.
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Platinum: The mineral native Platinum information and pictures
Platinum is the rarest and most expensive of the popular precious metals. It is much rarer then Gold. Due to its rarity and value, it is not readily available to mineral collectors and is seldom represented in in all but the highest-end mineral collections.
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Oct 01, 2016· I made a hand crusher and after about 5 minutes of that I started trying to figure out a better way. Went to the magical tool box and the magical scrap metal pile and came up with this Waaaaaaaay better It will crush a rock down in a minute flat. Ear plugs are manditory. Finding itty bitty bits of gold but nothing to write home about.
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How to Melt Gold Out of Rocks | Sciencing
Mar 13, 2018· You can't actually melt gold from rocks; if you hold a rock over a flame hot enough to melt gold and expect the gold to dribble out, you're going to be disappointed. The process of extracting gold from ore is a multistep one, and historically it has involved the use of some dangerous chemicals, including cyanide and mercury.
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Nov 10, 2010· Hi all,My kids and I pick up quartz when we are traipsing around the woods and take them back for rock smashing. Some are found in the streams, some are found in dried up river beds.I crush them up fine and sift them to about 30 mesh and then run them through a homemade gold …