Developed marble karst in Dahongshan mine has led to a great deal of water burst in mine shaft and rapid groundwater table lowering, resulting in a large scale of surface subsidence.

大红山矿大理岩岩溶发育，由于突水造成井下大量涌水，同时引起地下水位急剧下降，引发了较大范围、较大规模的地面塌陷。

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Contaminated water has been abstracted and treated from the mine since 1992 following an drainage burst which caused visible pollution from mine water coloured orange by the high iron content.

BBC: An archive picture of Wheal Jane