泗 顶铅锌矿的古丹矿区采用平窿开拓，其最低开拓中段以下尚赋存有规模不大的矿体。

In the Gudan mining district of Siding Lead-Zinc Mine, development has been carried out through driftway.

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张家口方言的调类与古调类相比也有平、上、去、入四声，但无浊声；

Compared to ancient tone type, Zhangjiakou dialect also has four tones: level tone, rising tone, falling tone and entering tone, but it has no voiced tone;

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