Which secondary diamond deposit is created by rivers or streams carrying diamonds to the shoreline or ocean floor?

• A. Marine Deposit
• B. Geochemical Testing
• C. Microdiamond Testing
• D. Cave Mining

Answer: (A)

Diamonds are transported from their original source by water, and when rivers and streams carry them down to the shoreline or settle on the ocean floor, they accumulate in a marine placer deposit. This marine deposit term specifically describes the nearshore or offshore accumulation formed by currents and wave action concentrating the dense diamonds. The other terms refer to methods or analysis rather than a type of depositional environment: geochemical testing is about search strategies using chemical indicators, microdiamond testing is about analyzing tiny diamonds for properties or origin, and cave mining describes a mining method rather than a depositional setting.