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contact reef
(South Africa) This term generally denotes the Ventersdorp contact reef, a gold-bearing conglomerate beneath the Ventersdorp lavas and frequently overlying mineralized horizons of the Witwatersrand system.
- スピーチの一部 noun
- 産業/ドメイン 炭鉱
- カテゴリ 炭鉱全般; Mineral mining
- Government Agency: USBM
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作成者
- ed.young
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