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河北省徠源縣,是我國久已著称的石棉礦区之一。在涞源境內,計有好几处石棉產地,其中最重要的一个則属烟煤洞(图1)。其他地点多未進行开
Laiyuan County, Hebei Province, China has long been known as one of the asbestos mining. There are several places of asbestos production in Huangyuan County, the most important one of which is a bituminous coal cave (Figure 1). Other places are not open