Ore deposits introductory courseSlides to Chapter P
Placers
[Gold, Mariana] [Gold, Rhône] [Garnet, Hoyazo de Níjar]
Gold panning at Mariana (close to Ouro Preto, Cuadrilatero Ferrifero).
Photo Lluís Fontboté, 1989.6.13/36 Copyright © 2001 - Lluís Fontboté - All Rights Reserved
Gold-panning exercise of the Geneva students at the Rhône River about 1 km downstream of Chancy,
at the border Switzerland/France.
Photo Lluís Fontboté, 2001.11.24/27 Copyright © 2001 - Lluís Fontboté - All Rights Reserved
Click on the picture for an enlarged version of this photograph
Gold-panning exercise of the Geneva students at the Rhône 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 Lluís Fontboté, 2001.11.24/20 Copyright © 2001 - Lluís Fontboté - All Rights Reserved.
Click on the picture for an enlarged version of this photograph
Gold-panning exercise of the Geneva students at the Rhône 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 Lluís Fontboté, 2001.11.24/34,36 Copyright © 2001 - Lluís Fontboté - All Rights Reserved
Click on the picture for an enlarged version of this photograph
Gold-panning exercise of the Geneva students at the Rhône 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 Lluís Fontboté, 2001.11.24/34,36 Copyright © 2001 - Lluís Fontboté - 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 Níjar, Almería, Spain.
Photo: Lluís Fontboté 200504/51
Click on the picture for an enlarged version of this photograph
Garnet as placer deposit in a creek within the Hoyazo de Níjar, Almería, Spain.
Photo: Lluís Fontboté 200504/47
Click on the picture for an enlarged version of this photograph
Garnet as placer deposit in a creek within the Hoyazo de Níjar, Almería, Spain.
Photo: Lluís Fontboté 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 Louis Duparc at the beginning of the XXth Century.
Photo: Pierre Perroud, 2015.
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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.
L. Duparc et M. Tikhonowitch "Le platine et les gîtes platinifères de l'Oural", Sonor, Genève, 1920:
"Planche H. Elévation de la drague Marion de 7 ½ pieds cubes"
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