Bavi mineral resources

Bavi Mineral Resources... is a natural accumulation of chemical elements in the Earth cover, that economically exploited by Human for their use • There are three kind:  Mineral resource

Bavi Mineral Resources

  Đ á tuổi Mezozôi: đá phun

trào axit hệ tầng Viên Nam tuổi Triat (T1vn2)

  Đ á tuổi Mezozôi: á phun Đ

trào axit hệ tầng Viên Nam tuổi Triat (T1vn1)

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GEOLOGICAL PROFILE SON TAY – MINH QUANG

• M.R is a natural accumulation of chemical elements in the Earth cover, that economically exploited by Human for their use

• There are three kind:

 Mineral resource point

 Mineral resource mine

 Mineral resource field

• Mineral resource divides to group:

 Metallic M.R.

 Nonmetallic M.R.

 Mineral water

Metallic Mineral resource in Ba Vi

1 Gold (Au): Xoan village, Van Hoa commune

2 Cupper (Cu), 265 cot on the way to Den Thuong

Nonmetallic Mineral resource in Ba Vi

1 Pyrite in Minh Quang and Ba Trai mines

2 Kaolin clay in Den Va and Tru Mat mines

3 Asbestos in Quyt vilage

4 Limestone in Che mine

5 Pozzolan in Thanh My commune

6 Laterite every where

7 Mineral water in Thuan My and Tan Linh communes

• The mineral pyrite, or iron pyrite, is an iron sulfide with

the formula FeS2 This mineral's metallic luster and pale

brass-yellow hue have earned it the nickname fool's gold because of

its superficial resemblance to Gold

• In the 15th century, such leaching began to replace the burning

of sulfur as a source of sulfuric acid By the 19th century, it had become the dominant method

• Sulfate released from decomposing pyrite combines with water, producing sulfuric acid, leading to acid rock drainage and potentially acid rain

• Iron pyrite exposed to air and water decomposes into iron oxides and sulfate This process is hastened by the action of

Acidithiobacillus bacteria which oxidize the pyrite to produce ferrous iron and sulfate

•

• FeS2 + O2 + H2O → FeOOH + H2SO4 + Fe2O3

•

Pirit Limonit Hematit

Minh Quang Pyrite mine

Kaolin clay

• In nature, clay is an assemblage of layer-form silicates, forming

by two main processes are weathering and sedimentation Layer structure of clay mineral is formed by basic structure units which are octahedron layers Al: [AlO4(OH)2 and tetrahedron layers Si: [SiO4]

• The formation process of Sialic weathering crust and bodies of Kaolin minerals from solid rocks is acid extrusive rock expressed

by the following chemical reactions:

•

Kaolinit Silicat tan

Kaolinit

Kaolin clay

devide into 2 types: Chrysotile Asbestos and Amphibole Asbestos

• Asbestos is a very good material for insulating, heat-insulation, and soundproof and very stable under the impacts of mechanics, chemistry,

so it is often used as insulated materials for electric equipments, anti-fire materials, and additive substances in roof shingle production

• Asbestos is a dangerous carcinogen substance, so using and exploiting tendency is decreasing recently.

Asbestos

• The U.S asbestos industry began in 1858 when fibrous anthophyllite was mined for use as asbestos insulation by the Johns Company, New York.

• Asbestos became more widespread during the industrial revolution; in 1866 it was used as insulation in the U.S and Canada

and crosidolite (blue asbestos) were formerly used in many products until the early 1980s Tremolite asbestos constituted a contaminant of many if not all naturally occurring chrysotile deposits The use of all types of asbestos in the amphibole group was banned in much of the Western world by the mid -1980s, and

in Japan by 1995

• Asbestos mineral of the Ba Vi National Park has been discovered in the fault zone along Xom Quyt – Gia De mountain Here in 1986, Hanoi Geological Party studied and explored one ore point in Gia De mountain with reserve of 5.000 tons Xom Quyt ore point was discovered and exploited by local people

in 2000s About the origin, Asbestos is a product of metamorphic exchange of magma and carbonate rocks Asbestos mineral points in Ba Vi may have been

•

• Xom Quyt asbestos formation reaction by limestone changing under the

following chemical reaction diagram:

•

•

sowing in the Figer 15 can be determine as Tremolite – Amphibole mineral.

• Pozzolan is a natural mineral – a product of volcanic ash and

volcanic rocks, assembled in the area near operating area of volcanos The main compositions of Pozzolan are silicate minerals containing free SiO2, Al2O3 oxides When mixing with quicklime (CaO), additives, water, free SiO2 and Al2O3 in Pozzolan will clot to form silicate minerals as following reactions:

SiO2 + CaO + H2O → CaSi2O5.nH2O

Al2O3 + CaO + H2O → 4 CaO.Al2O3.nH2O

• New hydrated Calcium-Silicate minerals will clot additives in mixing materials to harden to form bricks

Laterite

Mineral water

• There are two “real” mineral water sources: Thuan My Commune and Tan Linh Commune (Tan Vien Source)