The zimenqiao Formation silicolites of Lower Carboniferous is the country rock of Changkeng Au-Ag deposit.

下炭统梓质岩是粤西坑金银床的直接容岩。

The association of albite-bearing silicolites, phyllite and limestone seems to be an important prospecting indicator.

含钠质岩、千枚岩、灰岩合是找评价的重要标志。