The Jiama deposit is a structurally controlled stratiform skarn-type copper-polymetallic system. The majority of high grade mineralisation is associated with shear zone contacts between the Duodigou and Linbuzong formations and shear related folding. The zone of mineralisation within fault hosted skarn alteration measures kilometres in both strike and dip and remains open at depth to the northeast.
Mineralisation is also associated with granite porphyry dykes intruding the ‘Duodigou Marble’ and observed within the overlying hornfels of the Linbuzong Formation.
Although both deposit types are of lower grade than that of the skarn, the hornfels style of mineralisation may potentially be of further economic value in the future.
Three types of copper-polymetallic mineralisation are recognised in the project area, these include skarn, hornfels and porphyry hosted deposits.
High grade copper-polymetallic mineralisation is associated with skarn type alteration within shear zone contacts between the Duodigou and Linbuzong formations. This stratiform fault zone is tabular to lenticular in shape, has a variable dip, strikes west-northwest and hosts the primary lode.
The mineralised body itself has a 60° near surface dip angle which flattens to an average dip of 10° with depth. Thicknesses vary between 2 m to 240 m, averaging 33 m, its strike length is approximately 2,400 m and its length down dip ranges between 150 to 1,900 m. It ........
