How is Gold Formed on Earth

where gold comes from

I think most prospectors can REALLY learn from the video below. It’s one of my top picks for understand formations, even though we generally hunt for PLACER gold. Don’t forget… MAKE SURE you and your friends are subscribe to our new website for the giant giveaways coming up next month. It’s free to subscribe.

So… important to understand GOLD if you are hunting it.

In geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation during sedimentary processes. The name is from the Spanish word placer, meaning “alluvial sand”. Placer mining is an important source of gold, and was the main technique used in the early years of many gold rushes, including the California Gold Rush. Types of placer deposits include alluvium, eluvium, beach placers, and paleoplacers.

Placer materials must be both dense and resistant to weathering processes. To accumulate in placers, mineral particles must be significantly denser than quartz (whose specific gravity is 2.65), as quartz is usually the largest component of sand or gravel. Placer environments typically contain black sand, a conspicuous shiny black mixture of iron oxides, mostly magnetite with variable amounts of ilmenite and hematite. Valuable mineral components often occurring with black sands are monazite, rutile, zircon, chromite, wolframite, and cassiterite.

Alluvial placers are those formed in river or stream sediments. Typical locations for alluvial gold placer deposits are on the inside bends of rivers and creeks; in natural hollows; at the break of slope on a stream; the base of an escarpment, waterfall or other barrier.

Alluvial placers are formed by the deposition of dense particles at a site where water velocity remains below that required to transport them further.

To form a placer deposit, the particles desired must show a marked density contrast with the gangue material, which is able to be transported away from the trap site. Only if the deposit is winnowed in this way can the minerals be concentrated to economic levels.

 

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11 Comments on "How is Gold Formed on Earth"

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TeddyC
Member

Awesome documentary!!!!
A 2 mile long, 1 mile wide and thousands of feet deep hole in the ground but I can’t use a shovel only a trowel in a trout stream. Lol

mike9999n
Member

that was a good watch thanks
i love that kind of info show cool beans

Duck Gold Prospecting - Italy
Member

really interesting stuff! thank you for share

Jeremy Dix
Member

I could watch stuff like this for hours.. Or until the urge to pan overwelms me and drives me to get out and get in the rivers.. Very interesting

1oldcrusty
Member

Makes ya want to just run out of the house with a classifier and pan right now, right.

Rtinker
Member

Wow! Makes me want to be a geologist.

Buckshot Bob
Member
Buckshot Bob

Awesome report,thank you

peachessouthafrica
Member
peachessouthafrica

Wow, that was just an excellent and informative documentary.

Peaches

Canadian Gold Hound
Member
Canadian Gold Hound

This was Awesome!

LadyTuck
Member

This explains so much. I have never seen an article that varified my suspicions about this area better. I kinda had put it together piece by piece. But this is so exciting, finding varified is empowering..The Illinois Valley in Oregon is awesome..lovit

LadyTuck
Member

Does anyone know about “wire” gold?

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