Terrace mining is the term used to describe a mining method where the gem bearing rocks are exposed by digging horizontal terraces in step-like, generally circular formations. Blasting or digging is done and the debris is then washed to obtain the gem gravels.
Strip mining is similar, but is done on dry land. Large equipment, such as bulldozers, backhoes and excavators are used to strip the land away and uncover the wanted mineral. Large equipment, such as bulldozers, backhoes and excavators are used to strip the land away and uncover the wanted mineral.
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The Mining industry in India is a major economic activity which contributes significantly to the economy of India.The GDP contribution of the mining industry varies from 2.2% to 2.5% only but going by the GDP of the total industrial sector it contributes around 10% to 11%.