Well that largely depends on the type of mining. Gold can be panned from surface layers of dirt and diamonds are also available at the surface. To obtain large portions of either material most companies do make giant holes in the earth and use heavy equipment that guzzle gas and emit various chemicals contributing to greenhouse gasses. Then there are the ethics of the mining company to consider. Sometimes they will commit to restoring the land which they mined by filling in the hole and planting and sometimes they will abandon the hole and move on to new areas. If you want to take a vacation to “mine” diamonds yourself, there is a state park in Arkansas which has diamonds on or very near the surface, maybe you will get lucky and find an eco-friendly valuable gem.
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