区内金矿化类型主要有蚀变岩型和石英脉型，前者规模较大，后者较小。
There are two main types of gold mineralization in the district:altered rock type and quartz vein type, the former is in large scale and the later is in small scale.
结构化模型的扩展主要有首达时模型和偏移模型，前者考虑了契约中的障碍条款，而后者考虑了违约的成本，因此要求给予公司一个恢复期。
The former involved the barrier clause in a contract and the latter involved the cost of default, so the latter model demands a recovery period.
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