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بر اساس قانون معادن، معدن "به محدودهای اطلاق میشود که شامل ذخیره معدنی است." ماده معدنی میتواند جامد، گاز، مایع و یا محلول در آب باشد. طبق قانون، معادن از نظر ماده معدنی موجود در آنها به ۴ طبقه تقسیم میشوند: طبقه اولمواد معدنیای مانند سنگ آهک، سنگ گچ، شن و ماسه و امثال اینها را در بر میگیرد. طبقه دومشامل مواد فلزی مانند آهن، کُرم، طلا، ...
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