Hutti Gold Mines | Raichur

Mother Earth’s womb is an unimaginable treasure trove. Amongst all metals found so far in the earth’s crust, gold is the most precious one. Gold not only symbolizes an individual’s prosperity, but also represents the strength of the nation.

Mining for gold is one of the most ancient industries known to human civilization. In India, gold occurrences are noticed in various states, but few are economically viable.

Gold occurrences are found in very rugged areas of Karnataka too. Parched lands and dusty winds are the trademark of Raichur district, one of the most backward areas in the country. But what makes 3it rich is its gold deposits.

India’s only producer of primary gold, the Hutti Gold Mines company Limited, a government of Karnataka undertaking, conducts its exploration, mining, and metallurgy operations here.

The historical gold mining at Hutti can be traced as far back as the pre-Ashokan period which was over 25 centuries ago. But the modern mining started only around 1880. From 1880 to 1920, gold mining was undertaken by Messrs Jhon Taylor and Sons for Hyderabad Deccan Company owned by the Nizams if Hyderabad.

After Indian independence in 1947, the Hyderabad Gold Mines Company was incorporated. With the formation of Mysore state in the year 1956, the company was renamed as the Hutti Gold Mines Company Limited.

In the year 1985, the Chitradurga Copper Company and the Karnataka Copper Consortium Limited were amalgamated with the Hutti Gold Mines Company Limited. Since 1997, comprehensive modernization and expansion programmes are being conducted to maintain the high standards in gold mining.

HGML operates the Hutti Gold Unit with satellite mines at Ooty and Kira Buddhini along with the Chitradruga gold unit. The total capacity of these mines is about 5,50,000 tonnes per annum (TPA). The Hutti Gold Mines Company Limited is increasing its capability every and the production stood at over 2,360 kgs of Gold during FY 2011-12 resulting in a profit of nearly Rs 200 crore.

The Hutti Gold deposits is the Archean gold formations and is known as the Hutti-Maski Pre-Cambrian Greenstone Belt. The actual gold deposits occur in a host rock like meta-basalt, acid-volcanic rock and so on, in the form of a mineral, gold-quartz sulphide. Gold occurs with quartz veins and sulphide minerals, in different forms including microscopic and sub-microscopic particles.

The gold ore is produced with a variety of advanced mining technology by using bulk mining methods such as Large Dia Blast Hole Stoping and sub-level mining which are known for higher safety and productivity.

The production starts with mining, followed by crushing and then extraction. The ore extracted will be first transported through huge capacity shafts or bins, to a crushing circuit. This circuit uses a different variety of crushers to transform the ore into a fine powder. This powder will be weighed using an automatic sampler, and then will be projected for the production using five different kinds of reeves. After this, the grinding process of gold takes place. The grinding and milling process will produce two different concentrates namely, the stake tables concentrate and the Nelson concentrate. It is then further upgraded to produce a smeltable grade of gold.

These concentrates are then projected through chemicals called cyanidation, and carbon and pulp process. This helps the concentrate lose excess water and converts it into pulp. Then the leeching process happens with the help of different alkali, passing it through carbon and agitating with activated carbon in suspension.

The gold loaded carbon is then passed through columns and is recovered in electrolytic cells using steel wool as a cathode on which the gold is deposited. The gold is then refined as Jane stable concentrate which is roasted, magnate and finally smelted into bullion butters. The entire process is done carefully and through technologically advance methods. This not only makes the process highly efficient, but also eco-friendly.

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