There have been several instances in the last 150 years when valuable materials such as diamonds have been found contained in glacial debris. if one wanted to try to trace such valuable materials back to their source, which moraine would be most useful for tracing valuable gold deposits back to their bedrock source area?

Lateral moraine

Explanation:

It is important to note the duration of years here; 150 years ago. The Lateral moraine is a very familiar image when dealing with glaciers.

Therefore, the Lateral moraine would be most useful for tracing valuable gold deposits back to their bedrock source area since it is also an unconsolidated debris that is found on the side of glaciers.

i believe that it is a 45% chance.