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The Impact and Effect of Illegal Mining (galamsey) towards the . iron, precious metals, lead, limestone, nickel, phosphate, rock salt, tin, uranium, and molybdenum. Mining in a wider sense can also include extraction of petroleum, natural gas, and even . the 10th leading producer of gold in the world has a long history of mining before theMetallurgy is the process of working metal into artifacts (tools and toys). Although small amounts of metals are found in relatively pure form, most must be extracted from more complex ores by removing the "impurities" (non-metal or other metal) from the combination ore.