Which mining methods are used to extract diamonds from pipes?

The correct response regarding the extraction of diamonds from pipes involves mining techniques specifically suited to accessing and removing the diamond-bearing rock. Chambering and block caving are methods used in underground mining operations.

Chambering involves creating a series of chambers or cavities underground from which material is systematically extracted, while block caving allows for the breaking and controlled extraction of large volumes of rock. These methods are effective for accessing deeper deposits and are often utilized when traditional mining approaches, like open-pit mining, are not viable due to depth or economic considerations.

Other options, while mentioning mining methods, do not correspond to the specific techniques used to extract diamonds from pipes. Open-pit mining is often used for surface deposits rather than underground pipes, and placer mining primarily targets loose, secondary deposits found in riverbeds rather than the solid rock formations where primary diamond deposits are located. Thus, chambering and block caving are the most relevant methods for extracting diamonds from pipes.