Sphalerite Essay Example | Topics and Well Written Essays - 1250 words

Sphalerite - Essay Example As sphalerite is soft and fragile it is mostly best left unset as collectors or museum pieces. Gem-quality material is usually a yellowish to honey brown, red to orange, or green There are a number of ways sphalerite is formed; bacteria also play a role in its formation. In the regions where there is low oxygen solution such as flooded tunnels the bacteria's take in zinc and sulfur from the water and combine them to create a byproduct of sphalerite known as sulfide, which reacts with the metals including zinc creating insoluble products. This build up of microbial precipitation by the bacteria have led to the discovery of large zinc sulfide deposits by the miners. The biofilm formed is grey in color and is further developed naturally to form sphalerite. Sphalerite is a cubic crystal with zinc and sulfur atoms tetrahedrally coordinated. This structure is similar to that of diamond. The hexagonal analogue is known as wurtzite structure. The lattice constant for zinc sulfide in the zincblende crystal structure is 0.596 nm, calculated from geometry and ionic radii of 0.074nm (zinc) and 0.184nm (sulfide). It forms ABCABC layers. Sphalerite is obtained from underground mining. ... It forms ABCABC layers. Mining Sphalerite is obtained from underground mining. It is the ore of zinc that is formed in veins which are layers of rocks and minerals formed underground. It is found in sedimentary, igneous and metamorphic rocks. Sphalarite accumulates in deposits which can extend far underground. Thus underground mining is most suitable; other methods would be too expensive and difficult. The underground excavation is determined by strip ratio method which is the total amount of waste materials that need to be removed in proportion the amount of ore. Thus minimum possible waste is extracted. The underground mine of sphalerite consist of sophisticated network of tunnels, shafts and equipments. It is entered through a shaft, a horizontal tunnel or an adit which is a horizontal entry way. There are several levels in the underground mine and sphalerite in mined in rooms called stopes. It is drilled and blasted out taking care of the ceiling so that the mine does not collapse. Sphalarite mining process involves a number of equipments. Continuous mining machines are used which cut through rocks and pull them up, even separating the unusable ore from waste rock all in one system. Dump trucks are used in the mine to carry material to appropriate locations to different parts of the mine. At times shuttle cars are also used. Today in the modern era mining is a highly technological and mechanized process. Sophisticated vehicles, rail systems and state-of-the-art drilling systems are bought from manufacturers and suppliers. Ventilation systems pump in fresh air while removing poisonous gases and dust. Also, the roof is supported by timber, concrete or even steel supports. Steel rods are