Abstract
As ore-controlling structures, the Punda and Selanjan breccia pipes in Sarawak, Malaysia, are typical hypabyssal breccia pipes. Such breccias and their related mineralization types show distinct vertical zonation. The Punda ore-controlling breccia is a characteristic collapse breccia in the top segment of the hypabyssal breccia pipe, indicating that the erosional depth of the breccia pipe is shallow. The Punda breccia pipe controls the occurrence of a typical high sulphidation epithermal deposit and has good mineralization potential at depth. In the Selanjan breccia pipe, the ore-controlling breccia is a typical explosive breccia developed at the bottom of the breccia pipe, and a fluidization breccia in the middle segment of the breccia pipe. The explosive breccia and fluidization breccia control porphyry gold mineralization and low sulphidation epithermal mineralization respecti vely. The erosion of the breccia pipe is deep and is unfavourable for the preservation of gold mineralization.
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