Significantly improved recovery of slightly heavy minerals from quaternary samples using GTK modified 3″ Knelson preconcentrator

Chernet, T.; Marmo, Jukka S.; Nissinen, Ari

doi:10.1016/s0892-6875(99)00138-7

Cited by 16 publications

(5 citation statements)

References 1 publication

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“…80 kg in weight were taken by excavator at a depth of 2.5-4.5 m allowing at the same time the till stratigraphy to be studied. The samples were preconcentrated with a GTK modified laboratory scale 3" Knelson concentrator originally designed for extracting gold (Chemet et al 1999). Subsequent procasing methods included heavy medium separation, high and low intensity magnetic separation and dry sieving.…”

Section: Processing Methodsmentioning

confidence: 99%

Development of the Hydroxysulfate Green Rust on the Steel Surface Contacting with Water Ferric and Ferrous Salt Solutions

Lavrynenko¹,

Shchukin²

2015

Mìneral. ž.

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Section: Processing Methodsmentioning

confidence: 99%

Development of the Hydroxysulfate Green Rust on the Steel Surface Contacting with Water Ferric and Ferrous Salt Solutions

Lavrynenko¹,

Shchukin²

2015

Mìneral. ž.

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“…The size of samples (12 l) is commonly used in Finland in heavy mineral sampling (Hirvas & Nenonen 1990). In places where the till cover was thicker, additional till samples were (Chernet et al 1999) after it was tested for suitability for this size of till or weathered bedrock samples. After pre-concentration, the final concentration was made with a heavy liquid separation using methylene iodide (SG = 3.3).…”

Section: Heavy Mineral Samplingmentioning

confidence: 99%

Gold exploration using heavy minerals in till and weathered bedrock in Petäjäselkä, northern Finland

Taivalkoski

Sarala

Hulkki

2015

GEEA

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As a part of a gold exploration project in Petäjäselkä, northern Finland, carried out by the Geological Survey of Finland, heavy mineral studies and detailed till geochemical and stratigraphical studies were used for mineral exploration. These studies covered c. 22 km 2 in the Petäjäselkä area. The objective of this research was to find out how heavy minerals and till geochemistry can be used in gold exploration, and how they reflect the glacial dispersion in shallow till areas in Petäjäselkä. Furthermore, an automated mineralogical identification method (SEM-EDS) was tested in the indicator mineral research.Samples from till and underlying, pre-glacially weathered bedrock were collected from the test pits and trenches. A total of 381 heavy mineral and 713 geochemical samples were collected. The heavy mineral samples were concentrated with a spiral concentrator and a Knelson concentrator. The geochemical samples were analysed by ICP-AES and GF-AAS following aqua regia decomposition. The elevated gold contents and distinct anomalies found in till and weathered bedrock indicate the whole study area to have potential for gold mineralization. Based on microscopic and automated mineralogical studies, native gold was the only useful indicator mineral present in the heavy mineral samples for gold exploration in Petäjäselkä. The detailed till geochemical results show that the glacial transport distance in Petäjäselkä is short, only some tens of meters. Differences in the Au-Ag contents of the gold grains were noted between the three gold mineralized targets in Kerolaki, Selkä-Mäntypää and Ranta-Mäntypää. Arsenic, bismuth and tellurium proved to be pathfinder elements for gold mineralization both in till and weathered bedrock. The results of this study show that the heavy mineral studies, together with till geochemical studies, provide a useful method for identifying exploration targets in glaciated terrain. However, different methods of heavy mineral concentration affect the recovery of gold grains and thereby the final results of this study.

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“…Nevertheless, selected coarser fractions (1-8 mm) from both sample types were also studied for indicators and kimberlite fragments. Preconcentrates were made from screened 15 kg (Kaavi) and 45 kg (Kuhmo) excavator and 4-6 kg drilled till samples using a GTK modified 3WKnelson Concentrator (Chernet et al, 1999). The concentrator includes an attached semi-automatic pulp feeder that enables near quantitative extraction of moderately heavy minerals from till samples, which is controlled by regular processing of blank till samples each spiked with 0.25-0.5 mm fraction Cr-pyrope grains (Lehtonen and Marmo, 2002).…”

Section: Till Samplesmentioning

confidence: 99%

Glacial dispersal studies using indicator minerals and till geochemistry around two eastern Finland kimberlites

Lehtonen

Marmo

Nissinen

et al. 2005

Journal of Geochemical Exploration

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Significantly improved recovery of slightly heavy minerals from quaternary samples using GTK modified 3″ Knelson preconcentrator

Cited by 16 publications

References 1 publication

Development of the Hydroxysulfate Green Rust on the Steel Surface Contacting with Water Ferric and Ferrous Salt Solutions

Development of the Hydroxysulfate Green Rust on the Steel Surface Contacting with Water Ferric and Ferrous Salt Solutions

Gold exploration using heavy minerals in till and weathered bedrock in Petäjäselkä, northern Finland

Glacial dispersal studies using indicator minerals and till geochemistry around two eastern Finland kimberlites

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