在有些合同中，石油生产国的支付方式是让石油公司保留部分开采出来的石油。
In some other cases oil-producing nations pay oil firms by allowing them to keep a portion of the oil the company pumps.
青铜沟汞锑矿为充分开采井下资源，选择采用分段空场嗣后充填采矿法回采550~600 m中段的部分残矿体。
To fully exploit the resources, Qingtonggou Mercury-antimony Mine adopts the sublevel open stoping with delayed filling to recover the remanent ore-body at the medium stage of 550~600 m.
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