Marine diamonds are extracted in which manner?

• A. Onshore vacuum
• B. Rivers & streams
• C. Lamproite pipes
• D. Off shore (boats, robotic crawlers)

Answer: (D)

Marine diamonds are found on the seabed near the coast and are collected using offshore mining methods. Diamonds reach offshore sediments when river systems carry them into the sea and they settle on the continental shelf. To extract them, specialized vessels dredge or suction seabed gravel, and remotely operated vehicles or robotic crawlers process the sediment to recover the diamonds. This offshore approach is necessary because the deposits lie beneath the sea, not on land. Onshore vacuum and rivers & streams describe land-based alluvial mining, while lamproite pipes refer to a land-based geological source—both not applicable to marine deposits.