Distribution of minerals- Silver,Zinc, Bauxite, Mica (part-3)

Silver:

• Chief ores: Argentine ,Stephanite, and Pyrogyrite  and Pronsite .
• It occurs in mixed with zinc copper lead and gold.
• Silver is also found in blood zinc dose of the Zawaar mines (Rajasthan) Kolar Gold Field and Hutti gold mines of Karnataka largest producers Rajasthan, Jharkhand and Karnataka.

Zinc:

• Main Ore: zinc blende
• It is a mixed Ore containing lead and Zinc (PB + Zn) and more than 99% of the total zinc of India is produced in Zawar area in Udaipur district of Rajasthan.
• small quantity of this is also produced in Sikkim
• some deposits have been found in Udhampur district (Jammu and Kashmir) and South Arcot district (Tamil Nadu.)

Bauxite:

• An important ore of aluminium
• the deposits were found mainly in tertiary periods
• it is associated with laterite rocks
• largest reserves- Orissa, Andhra Pradesh and Gujarat.
• largest producers- Orissa, Gujarat and Jharkhand.

Mica:

• Three major types of Mica found in India are  (i) Muscovite (Potash mica) (ii) Biotite
• (Iron-magnesium mica) (iii) Phlogopite
• About 95% of India's mica is found in three states of Andhra Pradesh, Rajasthan and Jharkhand .
• Productions areas: Rajasthan : mica belt from Jaipur in NE  to Udaipur in  SW Rajasthan
• Bhilwara is the most important centre
• Light green and pink colour high quality Mica
• Andhra Pradesh  Nellore mica belt between Guntur and Sangam (100 kilometre long and 25 kilometre wide)
• Nellore mica is generally light green in colour
• Jharkhand and Bihar: a belt of 150 kilometre length and 20 kilometre witdh runs from Gaya to Bhagalpur through Hazaribagh Giridih and Munger.
•  Koderma is the most important centre and world's largest mica market
• this field contains the richest deposits of high quality Ruby-mica and Bengal mica
• Largest producers  Andhra Pradesh, Rajasthan and Jharkhand.