scheelite alluvial gold south africa

Mining   Placer mining  Britannica

Mining Placer mining Britannica

Placer mining. Placers are unconsolidated deposits of detrital material containing valuable minerals. The natural processes by which they form range from chemical weathering to stream, marine, and wind action. Typical minerals recovered in placers are gold, tin, platinum, diamonds, titaniferous and ferrous iron sands, gemstones (rubies, emeralds, and sapphires), and abrasives (rutile, zircon

Live Chat
Sperrylite

Sperrylite

Sperrylite is a platinum arsenide mineral with formula PtAs 2 and is an opaque metallic tin white mineral which crystallizes in the isometric system with the pyrite group structure. It forms cubic, octahedral or pyritohedral crystals in addition to massive and reniform habits. It has a Mohs hardness of 6 7 and a very high specific gravity of 10.6.. It was discovered by Francis Louis Sperry

Live Chat
Gold Prospecting   Prospector's Guide to Finding Gold

Gold Prospecting Prospector's Guide to Finding Gold

A guide to finding gold deposits for prospectors, geologists, rock hounds & the novice. Gold prospecting methods that are proven to work.

Live Chat
Tin processing  Britannica

Tin processing Britannica

Tin processing Tin processing, preparation of the ore for use in various products. Tin (Sn) is a relatively soft and ductile metal with a silvery white colour. It has a density of 7.29 grams per cubic centimetre, a low melting point of 231.88 C (449.38 F), and a

Live Chat
Topaz  Gemstone Buzz

Topaz Gemstone Buzz

Coating a thin film of gold is coasted over the surface of a colorless topaz to give a blue color.(Aqua Aura) Heat treatment some yellow, orange, brown to pink known as pinking process.; Irradiation to change light color topaz to deep brown to deep blue. By gamma rays in linear accelerators gives sky blue color, in nuclear reactors gives London blue color and with combination of linear

Live Chat
Mineral Shows   Mineral Specimens, News & Reports

Mineral Shows Mineral Specimens, News & Reports

Search Specimens Search Hints To see what's here using this search feature simply select from the available options in the pop up boxes. You may select multiples with in the same box by holding the button down while using your mouse to click the criteria that interest you. The same species name may appear more than once for several species such as benitoite and fluorite.

Live Chat
Ore

Ore

An ore deposit is an accumulation of ore. This is distinct from a mineral resource as defined by the mineral resource classification criteria.

Live Chat