求翻译：　尼日利亚西部地区片岩带分布有冲积金矿和原生金矿。在尼日利亚西北部和西南部已发现适合于大规模商业化开采的原生金矿。据了解，这些原生金矿埋藏较浅，等级相对较高，每盎司金的生产成本估计为50美元。是什么意思？

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western nigeria slate belt distribution areas are alluvial gold and native gold. In north-west and south-west Nigeria has been found suitable for the large-scale commercial exploitation of native gold. It is understood that these native gold buried relatively shallow, relatively high-grade per ounce

　Nigeria the western area schist belt distribution has silts alluviation the gold ore and the primary gold ore.Northeast Nigeria and the north west had discovered suits in the large-scale commercialization mining primary gold ore.According to the understanding, these primary gold ores bury shallowly

　Schist zone of alluvial gold deposits in Western Nigeria and native gold. In the Southwest and Northwest Nigeria has been found suitable for large-scale commercial exploitation of native gold. It is understood that the primary gold deposits buried in these shallow, relatively high level, an ounce o

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