What is ground sluicing?
Ground sluicing is a special technique for the mining of natural placers as well as artificial ones (tailings piles, for example). A natural flow of water is used to disintegrate and then transport the material through a sluice, where the valuable mineral is concentrated.
What are the methods of placer mining?
Contents
- 4.1 Panning.
- 4.2 Rocker.
- 4.3 Sluice box.
- 4.4 Dry washing.
- 4.5 Trommel.
- 4.6 Gold dredge.
- 4.7 Underground mining.
What is an example of placer mining?
1 Placer Mining. Placer deposits are loose unconsolidated and semi-consolidated materials. It forms by surface weathering, erosion of the primary rocks, transportation and concentration of valuable minerals. Small deposits of gold, tin, diamond, monazite, zircon, rutile and ilmenite are common example.
What is placer mining used for?
placer mining, ancient method of using water to excavate, transport, concentrate, and recover heavy minerals from alluvial or placer deposits.
How mining methods are done in underground?
It involves drilling a section of ore at the very bottom of the deposit and then blasting to make the roof collapse. Gravity then takes over, as the ore above the blast site fractures and collapses in succession as support is withdrawn. The collapsed ore is hauled out the mine for processing [source: Great Mining].
What is sluicing and hard rock mining?
In sluicing or hydraulicking methods, a slightly sloping wooden trough called a box sluice, or a ditch cut in hard gravel or rock called a ground sluice, is used as a channel along which gold-bearing gravel is carried by a stream of water. Another hand method involves the use of a sluice box.
What is sluicing linguistics?
In syntax, sluicing is a type of ellipsis that occurs in both direct and indirect interrogative clauses. The ellipsis is introduced by a wh-expression, whereby in most cases, everything except the wh-expression is elided from the clause. Sluicing occurs in many languages.
How does placer mining affect the environment?
Placer mining is a way of obtaining mineral and metal resources from loose river sediments. Due to the smaller scale of placer mining, it does less damage to the surrounding environment compared to other methods of surface mining, though it can still disrupt river ecosystems with pollution and sediments.
What does underground mining mine?
Underground mining Shafts are used for access by personnel and equipment, ventilation, and ore or waste haulage. Shafts are used in both underground metalliferous and coal mines.
How can placer gold mining equipment help with environmental problems?
In BC, the solution to environmental problems with small scale placer gold mining, is to adopt more modern methods using gravity concentrators along with recirculation of processing water. The Placer Gold Mining Equipment described here can offer a step forward in meeting those goals and to improved disposal reclamation methods.
How was the first placer mining done in the west?
The first placer mining in the West was done by hand methods. As the rich surface deposits became exhausted other methods were substituted. Under normal economic conditions the hand-shoveling method is applied mainly to deposits that are too small to justify the capital expenditure necessary for working them by other methods.
What are shallow placer gold deposits?
From the earliest times to the present day, the mining of shallow placer gold deposits has probably yielded more gold in the aggregate than has been derived from all other sources put together. They contain metallic gold in fragments of all sizes, ranging from the finest dust to nuggets weighing thousands of ounces.
What are the methods of mining for gold?
The actual moving of the gravel from place is always the principal concern of the miner, and often the gold-saving is entirely incidental to the working of the deposit. The following classification, therefore, seems the most logical and is the one generally used by placer miners: excavating by teams or power equipment; drift-mining.