Placer gold deposits of Arizona
Eighty-seven placer districts in Arizona are estimated to have produced a minimum of 564,052 ounces of placer gold from 1774 to 1968. The location, areal extent, past production, mining history, and probable lode source summarized for each district are based on information obtained from a wide variety of published reports relating to placer deposits.
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Placer Definition & Meaning | Dictionary.com
Placer definition, a surficial mineral deposit formed by the concentration of small particles of heavy minerals, as gold, rutile, or platinum, in gravel or small sands. See more.
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placer deposit | geology | Britannica
placer deposit, natural concentration of heavy minerals caused by the effect of gravity on moving particles.When heavy, stable minerals are freed from their matrix by weathering processes, they are slowly washed downslope into streams that quickly winnow the lighter matrix. Thus the heavy minerals become concentrated in stream, beach, and lag (residual) gravels and constitute workable ore ...
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GOLD PLACER DEPOSITS - Earth Sci
Residual placer deposits formed in the immediate vicinity of source rocks are usually not the most productive, although exceptions occur where veins supplying the gold were unusually rich. Reworking of gold-bearing materials by stream action leads to the concentrations necessary for exploitation. In desert areas deposits may result from sudden ...
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» Placer Gold Deposits Pay Off!
Placer gold deposits represent the most attractive targets for small-scale miners and prospectors, since activities can be carried out with reasonably small costs, and encouraging prospecting results can be obtained rapidly. A small-scale miner has the opportunity to exploit small, rich accumulations of gold which larger-sized mining companies might pass by, due to reserve-size and overall ore ...
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Significant Metalliferous Lode Deposits and Placer ...
sic-plutonic U lode, and placer Sn deposits. The lode deposit types are listed in order from those formed at or near the surface, such as various stratiform deposits, to those formed at deeper levels, such as zoned mafic-ultramafic and podiform chromite deposits. Placer deposit types are listed last. Some lode deposit types
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What does Placer deposit mean? - definitions
Definition of Placer deposit in the Definitions.net dictionary. Meaning of Placer deposit. What does Placer deposit mean? Information and translations of Placer deposit in the most comprehensive dictionary definitions resource on the web.
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Placer deposit - Wikipedia
Placer deposit and different forms of deposition Adapted from Placer Mine Deposits (p.4,21), by H. Harraz, 2013 Furthermore, placer deposit is a region known for anthropogenic activities such as ...
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Placer gold deposits of Arizona | AZGS Document Repository
Eighty-seven placer districts in Arizona are estimated to have produced a minimum of 564,052 ounces of placer gold from 1774 to 1968. The location, areal extent, past production, mining history, and probable lode source summarized for each district are based on information obtained from a wide variety of published reports relating to placer deposits.
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Placer Deposit - Minerals.net Glossary of Terms
Placer deposit. Area in a stream or river where heavy material settles after being carried downstream in the current of the river or stream. Gold is often found in placer deposits. < Back.
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Placer Gold Deposits of New Mexico - USGS
deposit that was the source of the placer gold is discussed for each district. A detailed search of the geologic and mining literature was made for in formation concerning all the placers.
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Placer deposits | SpringerLink
Placer deposits. The word "placer" was used by early Americans, and others, to designate gold-bearing deposits of stream gravel. This term is thought to have been derived from the Spanish plaza, meaning "place" or, locally, "sand bank.". The Germans used the word Seife, or Erzseife, for a placer type of mineral deposit, while the ...
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Prospecting Placer Gold Deposits
Placer Mining. General Geology of Placer-Gold Deposits. Characteristics of Placer Gold. Prospecting for placer gold, except perhaps in the case of buried placers, is the simplest form of prospecting. Gold, platinum, and tin are the principal metallic minerals won from placers, but gold (alloyed with varying percentages of silver) is the only ...
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Placer Deposit - Mineral, Types, Causes, Factors and …
Placer deposits occupy quite a huge range of geomorphological features, by which they are more simply categorized. Mineral sands, and in places diamonds, prefer coastal surroundings, whereas the other placer minerals are concentrated often in fluvial deposits.
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Different Types of Gold Placers. Classification of Placer ...
These deposits generally contain fine gold. (Also read about gold in the ocean). Glacial Deposits-these placer deposits are formed by glacial movement, transporting gold bearing gravel from different sources and depositing them elsewhere. Glacial gold deposits are very well known throughout the Midwest and Northeastern U.S.
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Utah's Gold Placers – Utah Geological Survey
A placer is a sand or gravel deposit, such as a beach or stream bed, containing concentrations of heavy minerals like gold. Gold is very resistant to weathering. As a rock containing gold is eroded, the gold is freed and carried downstream as dust, flakes, grains, and nuggets.
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Placer Deposits - SOEST
Placer Deposit Types From: D. S. Cronan, Underwater Minerals (1980) Hot Industrial Metal Future Energy, High-Tech Metals Industrial, Economic Where Specific Gravity = Density relative to H 2O (=1.00) in cgs units of g/cm3
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Placer Deposits, Tulameen River, Similkameen Mining ...
Platinum-group-element mineralization in lode and placer deposits associated with the Tulameen Alaskan-type complex, British Columbia. The Canadian Mineralogist, 28 (3), 503-535. Tulameenite. Placer Deposits, Tulameen River, Similkameen Mining Division, British Columbia, Canada.
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Gold Mining BC.com - Kinds of Placer Deposits
Kinds of Placer Deposits A placer deposit or placer is a deposit that formed in moving water where particles/pieces of gold and/or other dense minerals have accumulated because the water flow isn't sufficient to keep them moving.. In many cases, for a placer deposit to accumulate gold over time, the water must be moving fast enough to flush out lighter sand.
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Continental Drift Theory: Evidences and Drawbacks ...
Placer Deposits. Rich placer deposits of gold are found on the Ghana coast (West Africa) but the source (gold-bearing veins) are in Brazil, and it is obvious that the gold deposits of Ghana are derived from the Brazil plateau when the two continents lay …
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Placer Gold Deposit and Mining Beneficiation - JXSC
Placer deposit is a significant source of gold, placer mining was the main method used in the early years of many gold rushes, like the California gold rush. Next, I will do a description of the following aspects: Go to the What is the placer gold, Types of placer deposit, Placer gold mining flowsheet and equipment.
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What is Placer Gold and How do You Find it ...
A residual placer deposit is a placer gold deposit where the gold that broke loose from the vein get deposited just next to the main vain. This happens where there is not enough runoff water or glacier to move the gold materials into a river. Alluvial placers deposits consist of lose gold materials that have been moved away from the main vain ...
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What Is Placer Gold And How Much Is It Worth?
The sediment mixture from placer deposits is inserted into the upper end of the trommel, and then pressurized water is fed into the trommel. The combination of flowing water and agitation caused by the trommel's design will cause any gold bits to be separated from the rest. What you get after running the placer gold through the trommel, you ...
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beach placer | mining | Britannica
Other articles where beach placer is discussed: placer deposit: Beach placers form on seashores where wave action and shore currents shift materials, the lighter more rapidly than the heavier, thus concentrating them. Among the examples of beach placers are the gold deposits of Nome, Alaska; the zircon sands of Brazil and Australia; the black…
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(PDF) Placer deposits - ResearchGate
Fanuj titaniferous placer deposits are located in 35 km north west of the Fanuj, Sistan and Baluchestan province. The studied area comprises an integral small part of the late Cretaceous Fanuj ...
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Placer Gold Deposits of Arizona - Introduction – Western ...
Each placer is described briefly. Location is given by geographic area and township and range. (See pi. 1 for location of the placer gold deposits.) Topographic maps and geologic maps that show the placer area are listed. Access is indicated by direction and distance along major roads and highways from a nearby center of population.
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placer deposit | Encyclopedia.com
placer deposit Deposit of materials (e.g. gold, diamonds, tin, or platinum) that has been concentrated by mechanical action. Placer minerals generally have high density and resistance, and therefore may concentrate during various types of weathering. Source for information on placer deposit: A Dictionary of Earth Sciences dictionary.
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Types of Placers - Mineral Processing & Metallurgy
placer-gold-geology Types of Placer Deposits. There are two general types of placer deposits—residual placers and transported or alluvial placers. In both, the original source of the gold was in lodes, veinlets, stringers, or stockwerks in solid rock.
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Geology of Placer Deposits, Part 1 Reading a River - YouTube
If you want to find your own placer gold, what you know about how placer deposits form is critical. The more you know, the more successful you are likely to ...
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Placer mining - Wikipedia
Placer mining / ˈ p l æ s ər / is the mining of stream bed deposits for minerals.This may be done by open-pit (also called open-cast mining) or by various surface excavating equipment or tunneling equipment.. Placer mining is frequently used for precious metal deposits (particularly gold) and gemstones, both of which are often found in alluvial deposits—deposits of sand and gravel in ...
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Gold prospecting - Wikipedia
Gold prospecting is the act of searching for new gold deposits. Methods used vary with the type of deposit sought and the resources of the prospector. Although traditionally a commercial activity, in some developed countries placer gold prospecting has also become a popular outdoor recreation.
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Gold in placer deposits
Man most likely first obtained gold from placer deposits, more than 6,000 years ago. Placers account for more than two-thirds of the total world gold supply, and roughly half of that mined in the States of California, Alaska, Montana, and Idaho.Placer deposits result from weathering and release of gold from lode deposits, transportation of the gold, and concentration of the gold dominantly in ...
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What Is Placer Gold and Where Do You Find It?
Placer gold occurs when a larger lode deposit is worn away by flowing water. Small pieces of gold break away from the lode deposit and get carried off by the water. Placer deposits generally don't stray too far from their original site. However, some lucky prospectors have reported finding placer gold far from any known lode deposits.
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