rocks containing gold and diamonds

Strange Rock from Russia Contains 30,000 Diamonds

The astonishing amount of diamonds, and the rock's unusual Christmas coloring, will provide important clues to Earth's geologic history as well as the origin of these prized gemstones, Taylor said.

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Rocks & Minerals Definitions

Rocks & Minerals F-N. Feldspar ... Gold Gold is a rare element with the formulae Au and a relative hardness of 3 occuring in nature in widely distributed small amounts. ... Kimberlite is an igneous rock containing very little silica. Kyanite Kyanite has the formulae Al2SiO5 and a relative hardness of 7.

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Prospecting Encyclopedia: Geology of how Gold Deposits ...

Most byproduct gold has come from porphyry copper deposits, which are so large that even though they contain only a small amount of gold per ton of ore, so much rock is mined that a substantial amount of gold is recovered.

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10 Minerals More Valuable Than Gold - YouTube

Dec 16, 2013· In order from least precious to most precious and rare, here are some minerals that are sometimes more valuable than gold and even diamonds. 10. platinum 9. …

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Lamproite (a source rock for diamonds) | Western ...

Rocks containing high volumes of these olivine crystals are often the most rich in diamonds. In the Kimberley region of Western Australia, only the lamproites containing high volumes of olivine crystals have proved to contain economic quantities of diamond.

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Which countries contain gold deposits? - Quora

Dear sir/ madam. we are local miners and sellers off raw alluvial within Africa and global and representing various mining chiefdom's in Sierra Leone and west Africa, We presently have Gold dust, Gold in bars Form and Rough Uncut Diamonds,which is...

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Discovering Earth's Hidden Diamonds Just Got Easier

Diamond prospectors know that the secret to finding diamonds is to locate rocks called kimberlites. A new study in Nature this week may help them focus their search a bit more closely, and also ...

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Kimberlite - Wikipedia

Kimberlite is an igneous rock, which sometimes contains diamonds. It is named after the town of Kimberley in South Africa, where the discovery of an 83.5-carat (16.70 g) diamond called the Star of South Africa in 1869 spawned a diamond rush and the digging of the open-pit mine called the Big Hole.

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General Types of Gold Deposits - Minelinks

The indigenous gold content of these granitic rocks is invariably low, of the order of 0.003 ppm. Certain albitites and quartz-feldspar porphyry dykes and stocks with indigenous pyrite and pyrrhotite may contain up to 0.10 ppm Au and 1.0 ppm Ag, principally in the sulfide minerals.

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Peridotite: Igneous Rock - Pictures, Definition & More

Kimberlite with diamond: Kimberlite, the rock that is found in many diamond pipes, is a variety of peridotite. The specimen above is a piece of kimberlite with numerous visible grains of phlogopite and a six millimeter octahedral diamond crystal of about 1.8 carats.

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How can we recognize a rock containing gold? - Quora

I have been a professional exploration and mining geologist in the business of gold for close to 40 years. My answer to this question is: You can’t reliably recognize a rock containing gold, UNLESS the gold is present in large enough physical pieces to be visible to the naked eye (or to a 10x hand lens).

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Gold in Colorado

The low-grade mineralization commonly contains microcrystalline native gold attached to pyrite and was deposited in permeable host rocks and/or microfractures adjacent to the narrow, high-grade structures.

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Volcanic Minerals - Oregon State University

Kimberlite is a gas-rich, potassic ultramafic igneous rock that contains the minerals olivine, phlogopite, diopside, serpentine, calcite, and minor amounts of apatite, magnetite, chromite, garnet, diamond, and other upper mantle minerals.

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Diamonds in the Rough - Soonet

Jewels beneath the Earth's Crust . Diamond Fever. With the discovery of diamonds in Nunavut, Canada, in the early 1990's, a new area was heralded into mineral exploration and mining history. ... The eclogite is thought to form as the residue from partial melting of a subducting oceanic slab which contains rocks with a wider range of carbon ...

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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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Meteorites heading to Earth may contain trillions of ...

Traditionally, experts have argued that diamonds in meteorites form when asteroids collide. The shock of the crash is enough to crush carbon into tiny diamonds.

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15 Amazing Facts about Diamonds | Brilliant Earth

The first known use of a diamond engagement ring took place in 1477, when Archduke Maxmillian of Austria gave Mary of Burgundy a gold ring featuring an M spelled out in diamonds. 14 Lab created diamonds display the same chemical structure and physical properties as diamonds …

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How To Operate A Gold Pan: Panning for Gold, Diamonds ...

Jan 13, 2013· Gold panning is simple as long as you keep a few concepts in mind. And watch for gemstones as you pan for gold as diamonds, rubies, sapphires, platinum and other gems and precious metals have been found in many placers around the world.

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Prospecting for Gold - The GOLD HUNTER

These may contain gold and/or valuable base metals (copper, zinc, lead, etc). ... Breccias are zones of broken rock containing distinct angular rock clasts. ... 1998, Diamonds and mantle source rocks in the Wyoming Craton, with a discussion of other U.S. occurrences: Wyoming State Geological Survey Report of Investigations 53, 93 p. ...

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DIAMONDS & Host Rocks - gemhunter.webs.com

Diamonds are found in several rock types, but the primary commercial host rocks are kimberlite and lamproite [2]. And there are also secondary hosts known as placers that contain diamonds - like those found along the west coast of Africa.

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Silver: A native element, mineral, alloy, and byproduct

If the ratio between gold and silver reaches at least 20% silver, the material is called "electrum." Electrum is the name for an alloy of gold and silver. A significant amount of today's silver production is a refining byproduct of gold mining.

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Recent Advances in Understanding the Geology of Diamonds ...

Both peridotite and eclogite contain diamonds, but intact peridotites erupted to the surface with their diamonds in place are rare, while eclogites with their diamonds in place are common. (For a detailed description of rock type, see Kirkley et al., 1991.)

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Identifying Rocks : Identifying Gold Rocks - YouTube

Jun 08, 2009· Gold is a very rare and precious metal that is soft, malleable and heavy, and it is often found with other minerals, such as quartz. Learn about the differences between gold and fool's gold with ...

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Searching for gold in Michigan's rivers | Great Lakes Echo

Wetland specialists in Michigan are getting schooled in an obscure and unlikely area — gold prospecting. With prices reaching all time highs – approaching $1,900 this summer – Michigan has seen a boost in ambitious hobbyists searching for gold.

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Giant quartz rock containing $3 million of gold found in ...

A Canadian mining company has hit a rich seam of gold-bearing rocks in Western Australia, believed to be some of the biggest in mining history, and worth $10.7 million.

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Gold in lgneous,Sedimentary, And Metamorphic Rocks

Gold in lgneous,Sedimentary, And Metamorphic Rocks . Gold in Igneous, Sedimentary, And Metamorphic Rocks By Robert S. Jones GEOLOGICAL SURVEY CIRCULAR 610 ... Sedimentary rocks contain as little as 0. 3 to as much as 41 ppb gold. The average of 5.0 ppb is based on the average of 7.5 ppb for sandstone, 3. 9 ppb for shale, and 3. 5 ppb for ...

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What type of rock is most likely to contain diamonds?

Kimberlites are the rock type that diamonds are usually found in. They are formed when a magma from deep in the mantle drills its way to the surface in a fast gaseous explosive event.

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The Science of Bedrock Gold

The slate bedrock of the Kenai Peninsula’s gold-rich creeks is some of the most fascinating to work, and contains some very rich pockets. Bedrock off the Koyokuk River area creeks in the Brooks Range contains unusual bedrock formations where the schist stands on …

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Eight Natural Geologic Signs Pointing Toward Gold ...

Rock Contact Zones and Faults: Many quartz veins and other hard rock gold deposits occur in "zones" along faults or at the contact of two different types of rock. Correct Topography: As a general concept, the coarser gold does tend to hang up farther upstream.

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The GemHunter's Guide to Gold and Diamonds in Montana ...

Aug 12, 2013· The GemHunter's Guide to Gold and Diamonds in Montana ... Diamonds In Montana's Gold Fields Outline of the Wyoming Craton (basement rocks of Archean [>2.5 ... Ma=Millions of years ago) located 67 miles to the southeast. The rocks contain a host of xenoliths including garnet-bearing lherzolites, harzburgites, and dunites. The Williams ...

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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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List Minerals Associated with Gold

To know what type of rock is gold associated with you must see that the minerals most common in placer deposits are platinum, iridosmine, magnetite, iron pyrites, ilmenite, zircon, garnets, rutile and barytes; wolfram, scheelite, brookite and diamonds are less common.

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Gold Prospecting - Prospector's Guide to Finding Gold

that flattened and stretched the pebbles in the rock. Such rock sometimes contain gold, uranium and even diamonds - basically any type of heavy ... and (3) treasure hunters in your area. Rock hounding can make a nice combination with gold prospecting, gem prospecting, diamond hunting and gold panning. Gold nuggets from Douglas Creek, Wyoming ...

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Gold | Volcano World | Oregon State University

Photo shows gold jewelry recovered from the ash deposits of the 79 A.D. eruption of Vesuvius.. Gold forms in close association with volcanoes or is hosted in volcanic rocks. Three environments/styles are most common: gold in greenstone belts, gold in porphyry deposits, and gold in epithermal deposits.

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