Volcanic-hosted massive sulfide deposits from the Portuguese part of the Iberian Pyrite Belt

Our chapter organized its first field trip in 2015 (21.-27. April) to the Portuguese part of the world-class metallogenic province – the Iberian Pyrite Belt. This province is situated at the SW of the Iberian Peninsula extending from Seville in Spain to the south of Lisbon in Portugal. DSC_0668.This district has a long and rich mining history – from the pre-Roman times to present and is also known for an extraordinary density of the giant volcanic-hosted massive sulfide deposits (VHMS). DSC_0722This VHMS belt contains more than 85 massive sulfide deposits with total mass exceeding 1600 Mt of massive ore to which more than 2000 Mt of low-grade stockwork mineralization should be added. The mineralization is distributed between eight supergiant and a significant number of other smaller deposits. During the last hundred years approximately 80 mines have been operating. In total they produced ~ 300 million tons of polymetallic ores (Pb, Zn, Cu, Au, Ag, Sn), although sulfur and copper have been the main commodities processed in most cases.

No more for ore

no more for ore

The main attraction of this field-trip was the underground visit of the active mine Neves-Corvo (SOMINCOR company) – Cu-Sn-Zn ores. We have also visited the Lousal (S-Cu ores) closed mine with its wonderful science center, old open pit Sao Domingos (Au-Ag-Cu ores), which was mined for copper and gold since the roman times and several other localities in the field. Not mentioning the beautiful city Lisbon and its surroundings.

The 5 students participated in this 7-days field-trip, which was led by professor Jorge Relvas.

SGA News No 38 page 30

For more photos click here.

David Groves: The Digital Apocalypse

GrovesDear Geological Colleagues,

I am excited that I have just had my first contemporary novel published commercially, although some would say that some of my geological papers were fiction! “The Digital Apocalypse” examines the step-like course of life, love, heartbreak, despair and renewal of the human spirit amid a background of religious and environmental terrorism in the period of the most rapid social and technological change in human history: a digital, virtual reality “now” world where concerns about issues such as anthropological climate change cloud our judgement of the real threats to the future of our civilisation.

I would be thrilled if you would purchase a personal copy, and perhaps one for a friend, to start me on my way as a novelist and give me a platform to air common sense views about Australia’s future. Early sales strongly influence how well the book is eventually received. I am happy to sign any copies if we can meet to do so. The link to the publisher is below and an order forms is attached if you prefer.

Books may be purchased online from: Connorcourt Publishing or Amazon.

Vertical zoning of tin granite plutons in light of modern analytical methods

Czech Academy of Science, Institute of Geology, v.v.i., Praha Czech Science Foundation project No. P210/14/13600S
in collaboration with the SGA Prague Student Chapter

First announcement of international workshop

Vertical zoning of tin granite plutons in light of modern analytical methods

A 1596 m long fully-cored borehole CS-1 was realized in 1961-1963 in the Cínovec/Zinnwald granite cupola, Krušné Hory/Erzgebirge, Czech Republic. For more than 50 years this borehole represents one of the most inspiring sources of our knowledge about evolution of rare-metal granite plutons through the world.

Vertical zoning of the Cínovec cupola involving albite-lepidolite, albite-zinnwaldite, and albite-biotite granites combined with microgranites, feldspathites, greisens, and flat quartz veins gives an excellent opportunity for the study of magmatic/hydrothermal evolution of Sn- W-Nb-Ta-Li-bearing system and formulation of genetic models.

Rapid development of microanalytical methods in two last decades, electron microprobe and laser-ablation ICP-MS analyses, provides new, high precision chemical and mineralogical data. Back-scattered electron and cathodoluminescence imaging enable objective study of rock- and mineral textures. New data support formulation of more presumable genetic models.

Mining of tin and later also tungsten ores operating in Cínovec from the 16. century was interrupted in 1991. At present, some attempts for re-opening of the mine are going on. So the theoretical models may be immediately used in praxis.

Within the frame of Czech Science Foundation project No. P210/14/13600S we acquire principally new data about whole-rock and mineral changes along the borehole CS-1. In order to present these data, provoke discussion about the most plausible evolutionary model of this granite and deposit, and compare this object with other rare-metal granites worldwide, we organize two-day workshop connected with excursion to old tin mines in Krupka (Bohemia) and Zinnwald (Saxony).

Scope of the workshop: Vertical zoning of tin granite plutons in light of modern analytical methods

Place: Institute of Geology, Praha Time: 6.-7. October 2015 Tentative program:

  • Detail information about actual investigation of the Cínovec granite system
  • Contribution of other participants
  • Discussion about granite-related rare-metal deposits
  • Excursion to Krupka and Zinnwald

Contributions to all aspect of utilization of state-of-art methods in investigation of rare- metal granites are welcomed.

In case of your interest to attend this workshop, please contact us for further information.

Contact person: Karel Breiter, E-mail: breiter@gli.cas.cz