Placer deposit - Wikipedia
In geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation from a specific source rock during sedimentary processes. The name is from the Spanish word placer, meaning "alluvial sand".
Placer gold deposits. - YouTube
15.09.2008 · Where to hunt for gold - Where placer gold deposits in a storm Part 7 of 8 - Duration: 2:44. Prospector Jess 32,017 views. 2:44. Mix Play all Mix - GoldProspector DarcyCooper YouTube; Testing ...
GOLD PLACER DEPOSITS - Earth Science
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 flooding and outwash of intermittent streams.
Placer deposit | geology | Britannica
There are several varieties of placer deposits: stream, or alluvial, placers; eluvial placers; beach placers; and eolian placers. Stream placers, by far the most important, have yielded the most placer gold, cassiterite, platinum, and gemstones. Primitive mining probably began with such deposits, and their ease of mining and sometime great richness have made them the cause of some of the world ...
Prospecting Placer Gold Deposits
Placer-gold deposits result from the weathering and erosion of gold-bearing rocks. Change of temperature, water, and natural solvents disintegrate the rock and partly free the gold from its gangue. Running water transports the products of weathering seaward, meanwhile grinding them to smaller and smaller sizes and thus setting free more gold. Because of its high specific gravity the gold ...
Placer Deposit - an overview | ScienceDirect Topics
Minor gold placer deposits occur along the Chinese coast within river deltas that drain on-land areas of known gold occurrence. In Shandong Peninsula, placer deposits are mainly produced around lightly eroded coastal hills and bar lagoons, not in muddy tidal flat (Sun & Tan, 1986).
Alluvial and Placer Mineral Deposits | Geology for …
Alluvial is the name for placer deposits formed by water action in a stream or river. For most people, it’s all about alluvial deposits, or to be blunt, the allure of gold, with the odd precious and semi-precious gem thrown into the mix. You can still become an amateur gold or gem miner. You’re not going to wake up one morning, pack up the truck and decide to start an open-pit or ...
Gold Placer Geology - Mineral Processing & …
How Gold Concentrates in Placer Deposits. In theory, the richest part of a placer should be found near bedrock and, because of this, many people think that gold placers invariably are richer on bedrock than elsewhere within the deposit. On this basis, they believe that if indications of value are found in the upper horizons, pay gravel will surely be found on bedrock and countless mining ...
PROSPECTING FOR PLACER GOLD 1849 …
11.11.2018 · 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 modern or ...
What Is Placer Gold? - Gold Rush Nugget Bucket
Placer Gold: The Stuff You Gold Pan For. To start off, there are two types of gold deposits: lode and placer. Typically, lode deposits are the traditional veins of ore that are embedded in rocks and minerals. To recover gold from lodes, miners have to blast, mill, or treat the rock with chemicals to recover the gold …
» 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 ...
What Are Placer Ore Deposits? | Sciencing
Placer deposits were at the center of the great gold rushes of the nineteenth century in California, Alaska, the Yukon, South Africa and elsewhere. Being at or near the ground surface, placer deposits are easy to mine, do not require the complex and expensive machinery needed for other types of deposits and provide almost immediate rewards to the prospector.
Gold in placer deposits - USGS
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 ...
What is Placer Gold Mining? - Yukon - Charley …
Moving gravel by hand is arduous work and often placer gold exists in very small quantities, so it is no surprise that gold miners turned to steam-powered and then diesel-powered machines to make poor ground profitable. The earliest gold dredges in Alaska arrived in the 1910s, and by the 1930s several dredges were imported to mines along the Yukon River. They did the same work as earlier ...
Placer Gold vs. Lode Gold (and how to find it!)
Placer gold is the gold that most prospectors are more familiar with. This is the dust, flakes and nuggets that you can find by panning and sluicing a creek or river. Placer gold might have some rock attached to it, but generally it will be clean from most rock material and will be worn relatively smooth.
PLACER URANIUM, GOLD - publications.gc.ca
PLACER URANIUM, GOLD INTRODUCTION Placer deposits represent concentrations of heavy minerals of certain elements, particularly of gold, uranium, and platinum, by sedimentary processes. Depending on the age and the state of their consolidation, the deposits are empirically classified as paleoplacers if they formed in ancient coarse siliciclastic rocks, or as modern placers if they are a part …
Placer Gold Districts of Nevada - Burgex Inc.
There are several other minor placer gold districts of Nevada and many sub-districts that are not included in this map. All twelve of the major districts are included. Feel free to share and link to this map, a high resolution copy can be downloaded here. You can also find out more information about Nevada placer gold deposits in this report.