Rapu Rapu Island - Ungay Malobago, Hixbar


Main commodities: Cu Zn Au Ag
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The Ungay Malobago and Hixbar gold-rich Fe-Cu-Zn volcanogenic massive sulphide deposits are located on Rapu Rapu Island in Albay Province, the Philippines.

They occur within strata of probable Jurassic age and are spatially associated with dacitic volcanic rocks within a highly-deformed sequence of mafic volcanic and quartzo-feldspathic sedimentary rocks.

The massive sulphides are at the stratigraphic contact between footwall dacites and hangingwall mafic volcanic and quartzofeldspathic rocks. Both the deposits and their host rocks have been subjected to regional metamorphism with strong penetrative deformation. Metamorphic mineral assemblages and textural evidence suggest that peak metamorphism was upper-greenschist to lower-amphibolite grade and syn-D1 deformation. Based on the age of regional metamorphism, deformation is inferred to be mid-Tertiary in age. Deformation at Rapu Rapu resulted in reorientation of the strata into a broad antiform with strong shallow-plunging elongation fabrics, overturning of the volcanic sequence that hosts the Ungay Malobago deposit, and complex folding of the mineralized zones. The present highly linear form of the Ungay Malobago deposit is mainly a product of this ductile strain.

Sulphide reserves have been reported as 5.12 Mt @ 1.4% Cu, 2.4% Zn, 2.64 g/t Au and 29.6 g/t Ag,
  with total resources of 7.14 Mt at 1.23% Cu, 2.05% Zn, 2.54 g/t Au and 27.37 g/t Ag.

The most recent source geological information used to prepare this summary was dated: 2003.    
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd.   Unauthorised copying, reproduction, storage or dissemination prohibited.

  References & Additional Information
   Selected References:
Sherlock R L, Barrett T J, Lewis P D  2003 - Geological setting of the Rapu Rapu gold-rich volcanogenic massive sulfide deposits, Albay Province, Philippines: in    Mineralium Deposita   v38 pp 813-830

Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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