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RESEARCH GROUP

Ore Deposits Introductory Course Prof. Llu铆s Fontbot茅 and collaborators

Ore deposits introductory course

Table of contents (v. Aug 2013)

* Chapters marked with an asterisk are generally treated in the Master Courses on Ore Deposits, but Bachelor students can download them from

Introduction and general topics

A Economic Aspects
Slides complementing the course

B1 Ore Deposits - General overview of genetic processes and ore forming fluids

B2 Magmatic crstallisation and ore forming fluids

B3 Hydrothermal fluids: types, composition, transport, and precipitation

B4 Hydrothermal alteration
Slides complementing the course

*C1 Ore deposit classifications

*C2 Geometrical terms and other nomenclature aspects

Ore deposits according their geological context

*D Ore deposits in mafic and ultramafic intrusive rocks, without alkaline rocks
Examples: Chromite deposit, Ni-PGE in layered mafic intrusions
Slides complementing the course

*E Ore deposits in alkaline intrusions in stable areas
Examples: P, Cu, (PGE) in carbonatites, diamonds deposits

*F Felsic intrusions. Part I: phanerocrystalline textures. Pegmatites, greisen et skarn. Part I: phaneritic textures
Slides complementing the course

G Felsic intrusions Part II: porphyrocrystalline textures. The Porphyry System
Examples: Porphyry copper deposit
Slides complementing the course

H Extrusive rocks I: Submarine environment
Example: volcanic-hosted massive sulfide deposits (VHMS)
Slides complementing the course

I Extrusive rocks II: Continental and subaereal environment
Examples: Epithermal Au and Ag deposits
Slides complementing the course

J Sediment-hosted ore deposits. Part I: Fe and Mn deposits
Example: Banded Iron Formation (BIF)
Slides complementing the course

K Sediment-hosted ore deposits. Part II: Au-U and Cu-U ore deposit in clastic rocks
Examples: Kupferschiefer deposits; Sediment-hosted massive sulfide deposits

L Sediment-hosted ore deposits. Part III: Ore deposits formed by basinal brines in clastic and carbonate rocks
Exemple: Mississippi Valley Type deposits (MVT)
Slides complementing the course

*M Ore deposits in sedimentary rocks. Part IV: Chemical sediments (without Fe and Mn)
Slides complementing the course

*N Ore deposits in metamorphic rocks and orogenic gold deposits
Slides complementing the course

Surface processes

O Residual ore deposits
Examples: Bauxites, laterites

P Placers
Slides complementing the course

Q Supergene alteration and enrichment processes
Slides complementing the course

*T Acid mining drainage and other environmental problems related to mining

U Industrial minerals

Z References

 

Slides to Chapter P

Placers

[Gold, Mariana] [Gold, Rh么ne] [Garnet, Hoyazo de N铆jar]

Gold panning at Mariana (close to Ouro Preto, Cuadrilatero Ferrifero).
Photo Llu铆s Fontbot茅, 1989.6.13/36 Copyright 漏 2001 - Llu铆s Fontbot茅 - All Rights Reserved

 

Gold-panning exercise of the Geneva students at the Rh么ne River about 1 km downstream of Chancy,
at the border Switzerland/France.
Photo Llu铆s Fontbot茅, 2001.11.24/27 Copyright 漏 2001 - Llu铆s Fontbot茅 - All Rights Reserved
Click on the picture for an enlarged version of this photograph

Gold-panning exercise of the Geneva students at the Rh么ne River.
This student has obtained more than 50 visible gold particles and a good "black sand" (mainly magnetite and garnet).
Not a bad result after only 2 hours practicing!
Note the excellent separation between gold and other heavy minerals due to gravity differences.
Photo Llu铆s Fontbot茅, 2001.11.24/20 Copyright 漏 2001 - Llu铆s Fontbot茅 - All Rights Reserved.
Click on the picture for an enlarged version of this photograph

Gold-panning exercise of the Geneva students at the Rh么ne River.
In order to pick the tiny gold particles from the pan a good system is to use a fine pencil
and to drop each particle into a small recipient filled with water. Once the particle enters the water it sinks.
Photo Llu铆s Fontbot茅, 2001.11.24/34,36 Copyright 漏 2001 - Llu铆s Fontbot茅 - All Rights Reserved
Click on the picture for an enlarged version of this photograph

Gold-panning exercise of the Geneva students at the Rh么ne River.
In order to pick the tiny gold particles from the pan a good system is to use a fine pencil
and to drop each particle into a small recipient filled with water. Once the particle enters the water it sinks.
Photo Llu铆s Fontbot茅, 2001.11.24/34,36 Copyright 漏 2001 - Llu铆s Fontbot茅 - All Rights Reserved
Click on the picture for an enlarged version of this photograph

 

Garnet as placer deposit in a creek within the Hoyazo de N铆jar, Almer铆a, Spain.
Photo: Llu铆s Fontbot茅 200504/51
Click on the picture for an enlarged version of this photograph

Garnet as placer deposit in a creek within the Hoyazo de N铆jar, Almer铆a, Spain.
Photo: Llu铆s Fontbot茅 200504/47
Click on the picture for an enlarged version of this photograph

Garnet as placer deposit in a creek within the Hoyazo de N铆jar, Almer铆a, Spain.
Photo: Llu铆s Fontbot茅 200504/50
Click on the picture for an enlarged version of this photograph

A gold platinum placer deposit: dredge on the River Iss, Sverdlovsk oblast, Urals.
This place was explored by at the beginning of the XXth Century.
Photo: Pierre Perroud, 2015.
Click on the picture for an enlarged version of this photograph

The Marion dredge, beginning of the XXth Century.
The continuous chains of steel buckets is scraping the river's bottom and sends gravels
and gold and platinum nuggets in sluices where they are shaken and separated.
:
"Planche H. El茅vation de la drague Marion de 7 陆 pieds cubes"
Click on the picture for an enlarged version of this photograph