TALK BY PROF. FERNANDO GERVILLA

Title:The Ni-Cu-PGE Keivitsa deposit, Northern Finland: an example of hydrothermal remobilization of the platinum group elements(El yacimiento de Ni-Cu-PGE de Keivitsa (Norte de Finlandia): un ejemplo de removilización hidrotermal de elementos del grupo del platino).

Lecturer:Dr Fernando Gervilla Linares. Dept. Mineralogía y Petrología, Instituto Andaluz de Ciencias de la Tierra, Universidad de Granada.

Date:Tuesday 26th February 2013, 17.00h.

Place:room 2

Abstract:

El yacimiento de Ni-Cu-EGP de Keivitsa encaja en un cuerpo  máfico-ultramáfico intruido hace 2.05 Ga en la zona Central de Laponia, en el norte de Finlandia. El yacimiento está constituido por una diseminación de bajo grado de sulfuros de Ni-Cu en clinopiroxenitas olivínicas parcialmente alteradas. El yacimiento contiene también zonas ricas en metales nobles (EGP y Au) en las que el contenido medio total de metales nobles es de 2.19 ppm. Las zonas ricas en EGP+Au presentan una morfología de chimenea y se asocian a zonas con contenidos de Ni y Cl superiores a los valores promedio. La mineralogía de los EGP está constituida por minerales de Pt (braggita, sperrilita y moncheita) con menores cantidades de minerales de Pd (bismutotelururos de Pd), los cuales se encuentran, princialmente, incluidos en silicatos hidratados y, en menor medida, adheridos a los bordes de grano de los sulfuros. Las "chimeneas" ricas en PGE+Au constituyen el núcleo de una estructura zonada, difusa y asimétrica en la cual la distribución de azufre ocupa la zona más extensa, dentro de la cual se concentra el cobre y, en el núcleo central, el Ni y los EGP. Esta distribución espacial es el resultado de la remobilización hidrotermal de una mineralización de Ni-Cu magmática primaria.

To learn more about this deposit: Gervilla, F., Kojonen, K. (2002): The Platinum-Group Minerals in the Upper Section of the Keivitsansarvi Ni-Cu-PGE Deposit, Northern Finland. The Canadian Mineralogist, 40, 377-394.

TALK BY DR. JOSÉ A. BATISTA RODRÍGUEZ

Title: ALCANCE DE LOS MÉTODOS GEOFÍSICOS DURANTE LA PROSPECCIÓN DE YACIMIENTOS MINERALES EN OFIOLITAS (Scope of the geophysical methods during the prospection of ophiolite related mineral deposits)

 
Lecturer: Dr. José Alberto Batista Rodríguez (Universidad Autónoma de Coahuila. Escuela Superior de Ingeniería. México)
 
Day: Tuesday, 19th February
 
Hour: 17:00;  Room 2
 
Abstract: La prospección de depósitos minerales tiene como finalidad identificar y cuantificar los recursos y reservas minerales, vinculados a un ambiente geológico determinado. En este sentido los métodos geofísicos juegan un papel muy importante permitiendo estudiar las variaciones litológicas y estructuras de la región investigada, así como localizar y caracterizar cuerpos minerales. Dentro del grupo de métodos geofísicos más importantes para desarrollar esta tarea se encuentran los métodos eléctricos, magnético, gamma espectrométricos, gravimétrico y sísmicos.

En esta presentación se mostrará el alcance de los métodos magnético y gamma espectrométricos, en sus variantes aéreas, durante la prospección de depósitos de cromo y lateríticos de Ni-Co en ofiolitas. Tomando como ejemplo la región nororiental de Cuba, se muestran dos casos de estudio. En el primero, se realiza la inversión 3D de datos aeromagnéticos para caracterizar las unidades ofiolíticas y rocas asociadas. A partir del modelo 3D se pueden establecer criterios regionales para la exploración de depósitos ofiolíticos de cromo de grado refractario y metalúrgico. En el segundo caso de estudio, se muestran la aplicación de la espectrometría de rayos gamma para caracterizar los depósitos lateríticos de Ni-Co desarrollados sobre los macizos peridotíticos. La espectrometría de rayos gamma permitió establecer los límites de las cortezas de meteorización, valorar las variaciones cualitativas de sus espesores, así como definir bloques no laterizados ("intercalaciones estériles") dentro de dichas cortezas.

To learn more about this topic: Batista J., Pérez-Flores M.A., Quiroga-Goode G., Gallardo L.A., 2007, Geometry of ophiolites in Eastern Cuba from 3D inversion of aeromagnetic data, constrained by surface geology. Geophysics, 72, (3), May-June, B81-B91.

 
 

Barcelona SC wishes you a Merry Christmas!!

We wish that your tió* will be generous,
that the Three Wise Men won't ignore you,
That everyone of you have a caganer* in the crèche,
and that everybody look forward the 2013.
We wish you a Merry Christmas, a Happy New Year and in general...
HAVE NICE HOLIDAYS!

* you can learn more about the strange catalan Christmas traditions here and here.

Thanks, Nia, for this fantastic postcard!!

The Barcelona SGA Student Chapter on television.

The Catalan Public Television (TV3) has recently broadcasted the report about the pegmatites from the Cap de Creus. The report was included in the programme “El Medi Ambient” into the midday prime time. We would like to thank to the TV3 reporters for their effort and patience. What is clear is that the outcome is really excellent and informative. Enjoy it!

Field trip to the most important Pb-Zn-Ag mining area in Spain

 

Twelve members, together with one of the advisors (Dr Joan Carles Melgarejo) made a field work in the Pb-Zn-Ag mining area of La Unión (Murcia, SE Spain). The touristic gallery of the pyrite mine Agrupa-Vicenta was visited, and different zones were sampled for study. The visitants gratefully acknowledge the collaboration of Dr José Ignacio Manteca. You can see some photographs of the tour here.

 

Two new PhD students in our Student Chapter!

We have very good news!! Two members of the Barcelona SC have received a grant from the Government to do their PhD thesis in our department. On one hand, Sandra Amores, our treasurer, is going to join the team working on carbonatites from Angola. On the other hand, Lisard Torró, our vice-president, will continue his studies on VMS deposits in the Dominican Republic. CONGRATULATIONS! We wish you all the best for the next four years!

Barcelona SC member in the Dominican Republic

Lisard Torró, our Vice-president, spent two weeks in the Dominican Republic during December. There he presented the first results of his research in the Cordillera Central deposits to some interested mining companies; these results are partially included in his MsC thesis en-titled “Hydrothermal alteration processes registered under “Loma La Cuaba lithocap” area (Ampliación Pueblo Viejo), Dominican Republic: a Cu-Au porphyry-type mineralization style?”  Furthermore, field and core-sampling were carried out during his stay in the Ampliación Pueblo Viejo and Cerro de Maimón districts. These samples are thought to be used for his PhD thesis “the VMS and hybrid VMS-epithermal deposits connection in an intra-oceanic island arc setting: the example of the Cordillera Central in Dominican Republic” recently registered. Everton Minera Dominicana, Cormidom and Perilya companies are thanked for their support. 

 

Splendid visit to the Museu de Ciències Naturals (Natural History Museum) of Barcelona

The last 30th November the Barcelona SGA Student Chapter visited the Natural History Museum (Museu de Ciències Naturals – Museu Blau) of Barcelona. The tour was kindly guided by Marc Campeny, member of the Student Chapter, and Yael Díaz, both curators of this Museum.

The Natural History Museum, founded 132 years ago, restarted recently in a new building (Museu Blau). The exhibition holds over three million specimens in the fields of mineralogy, petrology, palaeontology, zoology and botany from all over the world.

The attendants enjoyed the event and the interesting explanations by the staff. The visit began with an itinerary through the history of the Earth, from the Precambrian to the present, with the observation of characteristic rocks and fossils of each period. The exhibition ends with about 1000 mineral specimens.

The event concluded with a social dinner, karaoke and party.

Doctoral Thesis: Kimberlites associated with the Lucapa structure, Angola

Next Monday, on 12th November, Sandra Robles Cruz, who has been a PhD student in our Department and member of our research group, will defend her thesis " Kimberlites associated with the Lucapa structure, Angola". You will have the chance to learn a lot about these fascinating volcanic rocks and the valuable information that can be obtained from their study. Everyone is very welcome to the presentation!

Day: Monday, 12th November

Hour: 10:30

Room: Aula Magna

Talks by Carl E. Nelson

Carl E. Nelson  is a senior consulting geologist and, since September 1988, the president of Recursos del Caribe, S.A., a consulting firm incorporated in Costa Rica and Panama (www.cbmap.net/consulting/carl-e-nelson). He kindly agreed to give two talks for the SGA Barcelona Student Chapter during his stay in Barcelona. Undoubtedly, this is a very good opportunity to meet a professional of the mining exploration and learn from his wide experience as consulting geologist. Everyone is very welcome!

Day: Tuesday, 6th November
Room: Aula Magna

Talk: The Pueblo Viejo deposit (Dominican Republic): characteristics and genetic models -- Características del depósito Pueblo Viejo (República Dominicana) y modelos genéticos
Hour: 17:00

Questions and answers: The role of the geologist in a junior mining company: conversation with a 30-year experience consulting geologist -- El papel de un geólogo en una empresa minera júnior
Hour: 18:00

Talk: Femic magma: a new player in the game

Due to the success of the previous talk by Dr. Robert F. Martin, he agreeded to give a second lecture also related with anorogenic magmatism.  This time the title of the talk will be: Femic magma: a new player in the game. We hope to see you next Monday (29th October) at 18:00 (Room 2) !

You can donwload the slides of the talk here.