Which country is cited as having secondary diamond deposits?

• A. Brazil
• B. Africa
• C. Namibia
• D. Canada

Answer: (A)

Secondary diamond deposits are alluvial (placer) deposits—the diamonds are weathered from their original primary sources and carried by rivers or sediments to river gravels, beaches, or other sedimentary zones where they can be mined. Brazil is cited because it has a long history of alluvial diamond mining in river gravels and coastal placers, illustrating how diamonds can accumulate downstream from their primary sources. In contrast, Canada is renowned for primary deposits in kimberlite pipes, and Namibia has significant deposits but is often discussed in the context of marine and other sources rather than as the classic example of secondary placers. Africa is a region, not a country, so it isn’t the single country being named here. Thus, Brazil is the best illustration of secondary diamond deposits among the options.