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Tin

The Tin, symbol Sn (from the Latin Stannum ) Is a chemical element atomic number 50 located in Group 14 of the periodic table elements.

is a very abundant metal in Earth's crust. Its principal ore is cassiterite, but can also be obtained from the estannina and cylindrite .

He became a metal exploded in various parts of the Shire of Villuercas Ibores Jara such as in Minas tin (cassiterite) from Cerro de San Cristobal .

ORIGIN

This metal was used in the form of bronze from III of the millennium, but as metal has not been known until the early centuries of our era. During the medieval period was an affordable substitute to make silver tableware and decorative objects.

CHARACTERISTICS OF TIN

is a silvery metal, malleable , not oxidized easily and is resistant to corrosion . Is found in many alloys and used to coat other metals to protect them from corrosion. One of its most striking features is that under certain conditions forms the tin plague. By bending a metal bar that produces a characteristic sound called tin cry , produced by the friction of the crystals that compose it.

ENVIRONMENTAL EFFECTS OF TIN

as simple tin atom or molecule is not very toxic for any type of organism. The toxic form is the organic form. Organotin compounds can remain in the environment for long periods of time. They are very persistent and not readily biodegradable . Microorganisms have many difficulties in breaking organotin compounds that have accumulated in soil water over the years. Organotin concentrations still increase because of this. The

organotins can spread through water systems where particles are absorbed by plants. Are known to cause much damage to aquatic ecosystems because they are very toxic to fungi, algae and phytoplankton . The phytoplankton is a very important link in the aquatic ecosystem, providing oxygen to aquatic organisms. It is also a important part of the aquatic food chain.

There are many different types of organic tin can vary widely in toxicity. Tributyl tins tin compounds are more toxic to fish and fungi, while tin triphenols is much more toxic to phytoplankton .

is known that organotins alter the growth, reproduction, enzyme systems and power schemes of aquatic organisms. The exhibition takes place primarily in upper layer of water, and that's where organotin compounds accumulate.

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El Cerro de San Cristobal, Logrosán

Don Vicente Sos Baynat in its publication, "Geology, Mineralogy and Minerologenia of the Sierra de San Cristobal, Logrosán (Cáceres)" considered that the granite rock formations and the process mineralization that formed the Cerro de San Cristóbal occurred during three different stages. The first during the formation of Hertzian mountains about 250 million years, the second during the Alpine mountain building makes Approximately 50 million years.

Logrosán Granite is classified as two-mica leucogranite and porphyria with compound fenocrsito small amounts of quartz and feldspar, biotite, apatite and rutile, as well as some iron oxide. There are three areas on the north side and one on the west slope of Cerro kaolinized are composed of granite. Granite which comprises the Cerro de San Cristóbal is completely surrounded by shale and sedimentary rocks. The slate is considered Precambrian origin, or of about 700 million years. The granite of Cerro de San Cristobal is surrounded by a well-defined metamorphic aureole composed of clay slate. This halo was formed when the introduction of granite that forms the Hill made contact with the surrounding shale. The nearest granitic region is more than 20 km. Logrosán west and is located just west of the town of Zorita.

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The Phosphorite



The Cassiterite is a mineral that results from oxidation of tin (SnO 2) is a typical mineral pegamtitas , ie is associated with late stage of granite crystallization ( neumatolisis ). In granites and pegmatites neumatolíticos, cassiterite is usually accompanied by wolframite, sheelita and mispíquel .

The cassiterite typically contains 87% tin and 21% of oxygen (plus iron , tantalum and other minerals ) is durísma, heavy and fragile, impervious to acids. Appears in crystals thick, prismatic, often in twin tetragonal system belonging to (with variants ditetragonales and dipiramidales). Less known is often the acicular tin , ie, fine crystals in the form of needle, or in a tin woody , similar to wood. Instead, it is unusual to see him as a loose globular granules ( pleasure tin).

• Hardness between 6 and 7 points on the Mohs Scale Exfoliation
• imperfecta. Specific Gravity
• between 6.8 and 7.1 Kg/dm3
• Color brown almost black (colophony less frequent in yellow, gray or red hyacinth
• System: Tetragonal
• Formula: SnO 2
• Hardness: 7
• Source: pegmatite, hydrothermal and secondary in river or marine pleasure.
• Sites: Germany, Czechoslovakia, France, USSR, Cornwall (Great Britain).
• Applications: As tin ore

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sedimentary rock of organic origin, formed mainly by phosphate minerals. mineral is a compact or earthy color yellowish white, formed by the phosphate of lime. It is used as fertilizer in agriculture after adding sulfuric acid to make it soluble.

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cassiterite mineral resources Mining Roman

mineral resources can be metallic and nonmetallic. Mineral resources are presented in mineral deposits, which are accumulations or concentrations of minerals than volume or content are economically profitable for exploitation. Mena is the substance of a profitable mineral deposit, and all mineral stone is not usable in mining because of low profitability.
metallurgical industry depends mainly on the metallic minerals (iron), as the base manufacturing of multiple devices and instruments that we use daily in our daily lives.

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Roman mining presents particular characteristics: the galleries are narrow and dome-shaped, walls topped with a fine work of bill and at certain intervals a hole in which to deposit the lamps lighting. Soils well made and when there are outstanding, have steps to facilitate the tours. It is easy to identify compared to later works, less care. To date we have listed two dozen examples, with which it is possible to determine aspects of planning and tillage conditions.

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The Mina

Bush, whose stem reaches up to 1 m. tall, woody, erect, and slightly grayish brown bark. Leaves scattered in little leathery, including linear and lanceolate. At the end of the twigs and in the axils of the upper leaves are racimitos and short panicles of flowers that, together, are terminal clusters of white flowers. The flowers of this plant, especially in the late afternoon, fire sweet smell of jasmine, the leaves have slightly bitter taste.

The bark contains resin, malic acid, albumin, wax, yellow coloring matter, volatile oil and dafnina, whose active ingredient is dafnetrina, robust, astringent and slightly soluble in cold water and a lot in boiling water, alcohol and ether. This plant was used in the mining world as a source of wound healing and the characteristics that had as its hardness was used to manufacture rope among other things

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Torbisco Marialina

In the municipality of Peraleda of an Román can see impressive mining facilities in what is known as Mina Marialina. In this spectacular place we find the facilities of what was a mine and two buildings next to it more, being one of them a home where people live connected with mining, possibly the owners, because the workers lived in nearby of the locality. As shown in the photographs the condition of facilities is quite bad and therefore the government of Extremadura has it with appropriate fencing and warning signs. On the walls of the building can be seen the traces of the machinery that would "embedded" in them. As for the building corresponding to the house we can say that you can see two main entrances, each located at the ends of the building. You can also see the home situation as remains. Similarly on the outside as well as other agencies have a well and a pylon.

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Venera Mina

in Campillo de Deleitosa we can find numerous mines where limestone was quarried primarily. Among the many things that attract attention in these places we can find the mine you can see in the image and is located in the area known as the Portalón Venera hence the name locals know where the mine. In its surroundings we see other similar but smaller size. This has great size and is surrounded by a masonry wall that possibly near the site. Within this scope we can find materials that once were removed from the site. Your explotacilón comes from old as the locals do not recall having seen the exploitation of these mines.

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Portalón of the Hungry

Navezuelas In the location we can find a mine known as the Hungry Mina. As shown in the picture, is a construction, by the way time and occurred in various avatars she finished closing completely, cerramieno which took the same local council. It is located outside the river and for this reason it was normal that his entrance was flooded by water. According to count the villagers' this mine was operated until the early twentieth century. It was removed from other materials Antimony. The following image shows how this mineral.

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Apatite in Logrosán

The presence of apatite in Logrosán is known since ancient times. Tradition has it that the Witches' Cercon Sabbaths were held in which the fire threw a white powder emitting fluorescent flashes. Sea Legend or reality, the truth is that the fame of this mineral passed our borders because the samples with which Proust first defined the fluorapatite, in 1781, came from this place. With the development of the fertilizer industry in Europe during the nineteenth century, created a high demand for phosphate minerals. Consequently, this site was the subject of numerous studies and attempts to use.

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In Extremadura, according to reports from the Junta de Extremadura, there are about 25 species of bats, but with a low density population which is considered an endangered species.
To ensure their protection and conservation, the government of Extremadura has a project called "Life" which includes a series of actions in specific areas of refuge where the most vulnerable colonies.

Bats are the only mammals that can fly and it is very fragile animals that do not cause any damage to buildings are not pests but colonies, are social and very beneficial in cities and in the fields as they consume thousands of mosquitoes and other insects at night.

Moreover, it is important to know that they are harmless and only bite in self defense, so that, as rabies can be present in wildlife, they should not directly manipulate.

However, experts consider it unlikely to cause any injury because of their small size have very tiny teeth, and remember that so far the most common bat houses, bat, and Cabrera Common have never presented a case of rabies.

Bats inhabit most of the caves and mines in nuetra region and proof of this is the last picture in which a sample.

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Bats Mines Deleitosa Campillo de Lime Mine Face

In this municipality we can find some splendid buildings which mining limestone was mined. It can be a huge admin explotadaa mine was open and there are still signs that indicate how to extract lime from there. Along with this mine we can find others whose entries are partially covered and being "inhabited" by the animals in the environment. Some of them can walk perfectly, while other galleries are fairly low so his visit is more difficult. On the other hand this is the fact that some cavities tools only have a gallery there are others, as shown in the image that has several galleries. The most impressive of the construction area is shown in the photograph below that corresponds to what might have been an oven. In one of its sides, the superior, you can see some "windows" that serve to introduce the lime and similarly one can observe a cavity in the front, whose function is unknown because there may be an entrance, but poor dimensions. The bottom side rests on bedrock. In the vicinity of this building you can see how in his day could have a house or other construction with a circular shape and leaving only the foundation.

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in Castañar of

In the town of Castañar de Ibor also we can find the Face Mine, popularly known among villagers as Lolita Mina. Its entrance, at present, totamente is covered by water but the depth of it is not much and you can see how water is flowing to the river is right next door. Mine is the largest known in the vicinity of the town, according to sources may have about 6 or 7 miles long. In this mine have been carrying out works to the 60. As can be seen around pulley systems that may serve to facilitate the mining work when moving the heavy trucks. As shown in the photograph at the entrance to the mine there are remains of what was once a station wagon and in it we read the following initials "VL."

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Ibor Ibor chestnuts Blacksmithing Mining

Ibor in chestnut not only we can find mines and wells but as shown in the image we can also find this magnificent ironwork. Visitors can observe a large number of scattered by the surrounding materials, such as blackboards or matalamita meterial, popularly known in the mining industry and smelting slag. There is no exact knowledge the time when it was built, but possibly belonging to the Roman period by the characteristics of its construction.

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Castañar de Ibor

In the township known as Castañar de Ibor we find some very interesting mining buildings. The photograph shows the entrance to San Benito Well known and very close to this cavity we find that outside the entrance to the mine called with the same name. The entrance to this is quite close but once inside we have a long gallery through which you can ride perfectly. Throughout the gallery the visitor can find a large number of bats that live at home and you can see in the pic. Similarly following his long gallery consisting of over 60 m. long you're with the well's mouth, above.
This mine was worked until the early 60's and it is extracted from other materials: quartz and copper.