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In page Illegal mining:

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Certified mining causes less threat and destruction to the environment than illegal mining because the guidelines they are required to follow aim to preserve the environment while extracting resources. Illegal miners generally lack knowledge or simply do not care about the environment they are mining. Illegal mining can destroy ecosystems in a variety of ways.[1] One of the simplest methods is the creation large mining pits that are not back-filled when they are finished, causing many people and animals to die from these pits.[citation needed]