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- از درزهای زیرزمینی که لایههای سنگ معدن هستند و به اندازه کافی ضخیم هستند که با نتایج سودآور استخراج میشوند، به دست میآید.
- استخراج معدن به دو صورت زیرزمینی و روباز وجود دارد. تعیین نوع استخراج بستگی به عمق کانسار دارد.
- شفتهای عمودی برای دسترسی به ذخایر از طریق استخراج زیرزمینی حفر میشوند، در حالی که در معادن سطحی یا روباز، خاک و سنگهایی که در بالای ذخایر معدنی قرار دارند حذف میشوند.
- هزینه استخراج از معادن سطحی کمتر از معادن زیرزمینی است. به همین دلیل است که استخراج سطحی غالب تر است.
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