Which mining technique is commonly used in developing countries when sediments contain heavy metals like gold?

Question

Quizplus · Accepted Answer

Placer mining is commonly used in developing countries when sediments contain heavy metals like gold. This technique involves the use of simple tools such as pans and sieves to extract the gold from the sediments. It is a low-cost method but can be environmentally damaging if done improperly.

Which Mining Technique Is Commonly Used in Developing Countries When