For which one of the following is Kolar in Karnataka, famous?

Kolar, located in the southeastern part of Karnataka, is historically and globally renowned for its gold mines, specifically the Kolar Gold Fields (KGF). Karnataka is India's leading producer of gold, and KGF was one of the country's three primary gold fields alongside Hutti and Ramgiri [2]. Mining operations at Kolar began as early as 1871 and reached depths of over 3,000 meters, making them some of the deepest mines in the world [1]. At its peak, the field contributed approximately 60% of India's total gold production [1]. Although the mines were closed in 2001 by Bharat Gold Mines Limited (BGML) due to environmental concerns and diminishing economic viability at extreme depths, the region remains a significant geological heritage site [5]. It is also notable for being the first mining region in the world to utilize electric power, sourced from the Shivasamudram falls in 1902 [t4].

Sources

1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 7: Resources > Table 7.11 > p. 21
2. [2] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 9: Distribution of World Natural Resources > gold > p. 34
3. [5] https://www.britannica.com/place/Kolar-Gold-Fields