Shaft mining.
Shaft mining.
Deep lead mining is a form of underground mining. Deep leads are old riverbeds that have become buried.
deep mining
deep mining
Deep shaft mining, open-cast mining & adit mining.
Shaft mining.
Shaft mining.
Surface mining occurs close to the surface (less than a mile deep), while underground mining is underground.
Deep lead mining is a form of underground mining. Deep leads are old riverbeds that have become buried.
Deep lead mining is a form of underground mining. Deep leads are old riverbeds that have become buried.
deep mining
deep mining
Deep shaft mining, open-cast mining & adit mining.
Surface mining is MUCH less expensive than underground mining. Usually. In some cases, underground mining is used because the substance being mined is just too deep to have a surface mine. I was just in a silver mine that is more than 5,000 feet deep. If the mine had to remove a mile of rock to get to the silver, it would not be worth mining. In THAT case, underground mining is less costly.
Advantages of Underground Mining are: * It allows minerals to be extracted from deep underground * It doesn't create a mess like open cut or surface mining * Does not affect the physical environment as much as surface mining
hard rock mining, underground mining
Ore was deep underground and it was expensive to extract.