Emeralds: from mines to jewels

Prof. Alain Cheilletz (University of Lorraine, Nancy, France)

26th April 2016- Mineralogical auditorium, 14:50 h.
(SGA keynote program)

Institute of Geochemistry, Mineralogy and Mineral Resources
2nd floor, Albertov 6, 128 43 Prague 2

You are Welcome!


Field trip to Morocco (High Atlas)

Thanks to cooperation with the Moroccan Chapter we organized international field trip to important Morocco bearings, participated by members of Prague Chapter and Moroccan Chapter in 13th to 21th March,2016 . Five czech members flew to Marrakech and visited some interesting deposits in High Atlas area (6th-13th) before the common program with our Moroccan colleagues.

Mibladen area

Mibladen area


Bou Azzer

Our program started with visiting Mibladen, area with galena mines and world-famous crystals of vanadinates. Then we explored also Taouz (Pb veins), Imilchil (pegmatites) and Imini (Mn ore). Poor vegetation on numerous large outcrops gave us great opportunity to study geology even from car.

In 13th March we met with Mococcan SGA chapter in Agdz and next day we looked at the Bou Azzer mining district and ophiolitic suture zone (Pan-African mineralization of the Anti-Atlas belt (Co-Ni-As) with nice samples of skutterudite).

pyrhotine in shale

pyrhotine in shale (Draa Sfar)

In following days our interests were heading to variscan central Jebilet Massif with visiting Draa Sfar Mine (VMS polymetallic ore deposits), the Kettara district (VMS and SEDEX) and the BirN’Has deposit (base metal veins in metapelites and carbonates). Thanks to MANAGEM mining company, we could visit their underground mines.



Then a Meeting took place at the Faculty of Sciences Semlalia, Marrakech. Prof. Omar Saddiqi (Hassan II University, Casablanca) was talking about the Geology of Morroco. Mr. Mustapha Chaib (ONHYM mining company, Rabat) have been presenting about the Moroccan mining potential. And Mr. Jan Bubal (Prague Chapter) had presentation about the Geology of Czech Republic.

Next field visit was directed to the Azegour Skarn deposit and surrounding areas (Mo, W, Cu deposits; western High Atlas). And the last day we visited Benguérir phosphate deposit (Cretaceous/Tertiary) with OCP mining company.

outcrops everywhere

outcrops everywhere

SGA News No 39 page 1

For more photos click here.


Central Krušné hory Mts. (Erzgebirge): Freiberg and small stops on the czech side

Last excursion of the 2015 (7th-8th November) led us to German city Freiberg, where we visited the historical shaft (Pb-Zn-Ag vein type mineralization) and the Terra Mineralia exposition with world famous mineral samples.

Pavel with Pb-Zn-Ag vein mineralization

Pavel with Pb-Zn-Ag vein mineralization

On the second day it led us to Antonsthal ore heap (skarn) and localities in the field on the Czech side of the borders: Loučná (pyroclastics with large pseudoleucite crystals) and Ahníkov (lateritized ultramafic body with veinlets of pink and violet chalcedony).



This two-day excursion provided interesting insight into geology and history of mining at the Saxony and it was a chance as well to visit one of the best mineral collection in the World. This excursion was attended by 22 Chapter members.

SGA News No 39 page 18  
For more photos click here.

Mineral deposits of Poland (Mississippi Valley type and the Kupferschiefer)

Traditional October field-trip (10th-13th, 2015) of the SGA Student Chapter Prague was this year dedicated to mineral deposits of Poland.

Main attractions of this four-day field trip were underground visits to the two active mines – Pomorzany mine (Pb-Zn, Mississippi valley type deposit) and Polkowice-Sieroszowice mine (Cu, Kupferschiefer type deposit) run by the KGHM Company. We have also visited the famous salt mine Wieliczka and the historical city Krakow.

Polkowice-Sieroszowice mine

Polkowice-Sieroszowice mine (salt)

10th: Tourist mine Kletno located in the Snieznik Massif (U) and historical city Krakow.
11th: Salt mine Wieliczka and students from SGA Baltic Student Chapter prepared lectures about the main mineral deposits of Poland
12th: Active underground mine Pomorzany located within the Olkusz area and dumps of the Bytom area (Pb-Zn Mississippi Valley type)
13th: Active Polkowice-Sieroszowice mine (Kupferschiefer and salt)

This trip would not be possible without the amazing help of the former SGA Baltic Chapter president Joanna Kolodziejczyk and we would like to thank her a lot for her help and effort she put into this. Also we would like to thank to Władysław Zygo and Jaroslav Prsek for accompanying us at the mine visits and to KGHM Company for making the underground visit possible.

SGA News No 39 page 17                      


Polkowice-Sieroszowice mine (Kupferschiefer)

For more photos click here.

Stříbro and Planá-Michalovi hory ore district (Western Czechia)

One day field trip to Western Czechia was held on 18th May 2015. vozíky u štoly Prokop, Stříbro

Twelve students led by Mgr. Jan Bubal visited Open-Air museum in Stříbro with visiting of gallery Prokop and near ore heap (Pb-Zn mineralization).

Close to Stříbro, we also looked at the Vlčí hora Mnt. consist by tertiary basalts and pyroclastics with large phenocrysts of augite and amphibole. 

ore heap near Stříbro
In following area Planá-Michalovi hory ore district we saw some old open pits with Pb-Cu-Ni-Co mineralization.

For more photos click here.



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.

Diverse mineralization styles and ore-forming processes in the Krušné hory/ Erzgebirge Mts.

Our Chapter organized its last field trip in 2014 (7.-9. November) to investigate various mineralization styles and mining activities in the Krušné hory/Erzgebirge Mts., the mountain region spanning the border between the Czech Republic and Germany.
14-11-SGA_erz (66)
IMG_0472The main attractions of the field trip were underground visits to:            –the historical mines of Krupka (hydrothermal Mo-W vein mineralization)    –Markus-Röhling-Stolln in WiesaSchönfeld (Ag-Co mineralization)              –Dorothea-Stolln in Annaberg-Buchholz (Ag-CoNi-Cu mineralization)      –Markus-Semmler Stollen in Schneeberg (U stockwork)                                –with several stops including Zlatý kopec (polymetalic magnetite skarn).

Fourteen students participated in this 3-days field-trip, which was led by David Dolejs.

SGA News No 37 page 17

Geology and metallogenesis of the Iberian Pyrite Belt and rehabilitation of an old mining village

February 18, 2014
Prof. Jorge M.R.S. Relvas (University of Lisbon):
Geology and metallogenesis of the Iberian Pyrite Belt: an overview
Dr. Álvaro M.M. Pinto (University of Lisbon): Lousal: environmental, social and economic rehabilitation of an old mining village in Portugal