发现油气资源后，勘探许可证持有方有两年时间进行资源评估。

After that, subject to an oil and gas discovery, the license owner will be given up to two years after the discovery for evaluation.

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勘探许可证最初的有限期间约5年，此后可能要求将租赁面积的一半或更多的面积交还给国家。

Exploration licenses are initially of limited duration (about 5 years) after which there might be a requirement to return half or more of the licensed acreage to the state.

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根据1920年的《矿藏租赁法案》，内政部长有权颁发对某些矿产(如石油和天然气等)的勘探许可证和祖约。

Under the mineral Leasing Act of 1920, the Secretary of the Interior was empowered to issue prospecting permits and leases for certain minerals such as oil and gas.

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