What is the difference between reef gold and alluvial gold




















Alluvial Gold Deposited by water movement and Eluvial gold disintegration of rock at the site where it originates - not there through water movement are essentially primary gold broken down by weathering and erosion and transported by gravity or water movement over many millenia of geological time. Where You Find Gold There Will Be More What does all this mean - basically where you find gold, or where it has been found in the past is a good indication of further gold that can be found in that area.

Alluvial Gold Eluvial Gold Relationship to primary source of gold Fine gold and small nuggets Can be transported many kilometers from source of gold. Can be ancient alluvial gold deposits in ground lifted high above current stream levels.

Large nuggets, may be closer to primary gold source. Don't forget to refer to the following pages to increase your understanding of; How is Gold Formed.

Where to Find Gold. Old Gold Mines. Salt Lake Metal Detecting. Enjoy this page? Please pay it forward. Here's how Would you prefer to share this page with others by linking to it?

Click on the HTML link code below. Copy and paste it, adding a note of your own, into your blog, a Web page, forums, a blog comment, your Facebook account, or anywhere that someone would find this page valuable. These terms are describing arch-like folds in the rock layers. A syncline is a fold where the youngest rocks occur in the core of the fold. In an anticline, it is the oldest rocks which occur in the core.

Exposed anticlinal fold , Castlemaine VIC. We have lots of other great resources for gold prospectors on Goldfields Guide, check a few out here:.

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Great to book on your own or as a fun day out with the family, a training session with Green and Gold Prospecting offers valuable insight into the world of gold prospecting, and equips you with the knowledge you need to successfully search for gold on your own.

Regardless if your treasure is gold, coins, relics, rings, buckles, buttons, bottles or the countless other wonderous things we all chase on land and sea, this site is dedicated to you.

Leave a comment. Leave comment. Enter the code word below into the text box Reload Image. A gold reef is where the gold is found still deposited in its original rock host. In Ballarat this rock was usually quartz, in what is described as a reef.

Alluvial gold was gold that had come loose from its original host, and had been deposited by water action into creeks and rivers. Over time, many of these creeks and rivers were covered over by later geographical changes and became buried below the surface. Because gold is heavier than most of the material moved by a creek or river, it can become concentrated in hollows and trapped in the bed of the river.

These are known as secondary alluvial gold deposits and they can be worked using a gold pan or cradle. Alluvial gold deposits sparked the Australian gold rushes of the 's. Mostly, gold is spread throughout the rocks and soil around us but in such low amounts that it's not worthwhile trying to get it out. However, there are some places where there is enough gold to make it economic to mine. Most gold mined in Australia today cannot be seen in the rock, it is very fine grained and mostly has a concentration of less than 5 grams in every tonne of rock mined.

The feasibility of mining low concentrations of gold largely depends on the price of gold. Gold is bought and sold every day on international gold markets. The price fluctuates according to demand by buyers and the amount being sold by sellers. In a few places gold is sufficiently concentrated in the rocks for it to be worth mining.

Australia especially Western Australia is the one of the world's top producers of gold. Virtually all resources occur in primary deposits, many of which have undergone some degree of weathering.

Weathered primary deposits are important to the gold industry because they are usually easier and cheaper to mine and the gold is easier to recover. At Olympic Dam SA gold occurs and is mined with copper and uranium. Secondary deposits are no longer major sources of gold in Australia. Gold usually occurs in its metallic state, commonly associated with sulphide minerals such as pyrite, but it does not form a separate sulphide mineral itself.

The only economically important occurrence of gold in chemical combination is with tellurium as telluride minerals. Replica of the Welcome Nugget. The largest gold nugget ever found was the 'Welcome Stranger', found in just under the soil at the base of a tree! Quite a find! The second largest gold nugget ever found was the Welcome Nugget It was located in the roof of a tunnel 55 metres underground.

Further resource and production information. There are both open-cut and underground gold mines in Australia but most of Australia's gold production comes from open-cut mines. Earth-moving equipment is used to remove waste rock from above the ore body and then to mine the ore. Waste and ore are blasted to break them into sizes suitable for handling and transport to waste dumps or, in the case of the ore, to the crusher.

Underground mining is used where the depth of ore below the surface makes open-cut mining uneconomic. Vertical shafts and declines spiral tunnels are used to move people and equipment into and out of the mine, to provide ventilation and for hauling the waste rock and ore to the surface.

Extensions of deposits mined by open pit methods may be mined later by underground methods beneath the old open pit.

The processing of gold ore involves crushing, treatment with chemicals, melting smelting and further purification. It is then poured into moulds where it cools and hardens as gold bars called 'bullion', which make the gold easy to stack and transport.

The first stage of processing gold ore is crushing. The gold then needs to be separated from the resultant powder. Coarse gold may be removed by gravity concentration. The powder is mixed with water, the gold sinks and the other wastes are washed away. Fine gold in crushed ore will be processed differently depending on the nature of the gold ore itself. Free-milling ore is the name for when gold can be recovered by crushing, grinding and cyanidation treatment with a dilute cyanide solution without additional processing.

In refractory ore the gold is locked in sulphide minerals, so to achieve satisfactory levels of gold recovery additional processing is required before cyanidation. Sulphide minerals in refractory ores are converted to oxides by either roasting or biological leaching to release the gold.



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