Answer:The most useful for tracing valuable gold deposits back to their bedrock source area is the
Lateral moraine
Step-by-step explanation:
Lateral moraines are sharp created piles of glacially transported rocks and debris that are dropped by the ice as it melts. This makes them good indicators of where the line between the accumulation zone and the ablation zone. They often remain on the landscape long after glacier retreat making them a valuable site for gold deposit.