Research paperA drainage sediment geochemical orientation study at Boddington, Western Australia
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Weighting of BLEG data with drainage and catchment properties to enhance Au anomalies
2021, GeochemistryCitation Excerpt :In the laboratory, the samples for BLEG (-16 mesh) analysis were leached in 2 L of cyanide solution in a bottle roller, tumbler, with 0.1–0.3 % cyanide and either lime or sodium hydroxide, and rolled for 12 h (Yilmaz et al., 2015). The efficiency of the leaching was dependent on cyanide concentration as well as pH, oxygen being available, duration of agitation, particle size, availability of gold, and the absence of competing precipitants for gold, for example, organic matter and sulfides (cf. Mazzucchelli, 1990; Beeson, 1995). The metals, after leaching, were precipitated on zinc powder.
Singularity mapping of bulk leach extractable gold and −80# stream sediment geochemical data in recognition of gold and base metal mineralization footprints in Biga Peninsula South, Turkey
2019, Journal of African Earth SciencesCitation Excerpt :Geochemical surveys have been applied to derive signatures of ore-forming processes or to generate spatial proxies of ore-deposition events (Afzal et al., 2010; Darrehshiri et al., 2015; Yilmaz et al., 2017). BLEG and −80# stream sediment samples are frequently used in regional-scale geochemical studies for mineral exploration (e.g., Beeson, 1995, Radford, 1996; Yilmaz, 2007; Mokhtari et al., 2009; Geranian et al., 2013; Yilmaz et al., 2015; Parsa et al., 2016, 2017a, b, c). Precise delineation of geochemical anomalies through stream sediment sampling is a major concern for regional exploration surveys and is a critical undertaking.
Comparison between the effectiveness of regional BLEG and −80# stream sediment geochemistry in detection of precious and base metal mineral deposits in Western Turkey
2017, Journal of Geochemical ExplorationCitation Excerpt :Both BLEG and −80# (<180 μm) regional stream sediment surveys led to the discovery of a number of epithermal or porphyry-style Au-Ag-Cu deposits in Western Turkey from the late 1980s onwards (Eurogold, 1996; Colakoglu, 2000; Oyman et al., 2003; Yilmaz, 2003b, 2007; Yigit, 2009; Yilmaz et al., 2010, 2013). In sediments where the Au is fine grained and free, previous studies have indicated similar spatial geochemical patterns between BLEG and either aqua regia or total Au contents of the fine fractions (Ledic and Itard, 2003; Simmonds et al., 2015), but where Au is coarse-grained, bound up in other mineral phases or associated with organics (Cohen et al., 2005) or where the efficiency of the BLEG leach is affected by sample composition or variation in the digestion method itself (Mazzuchelli, 1990; Beeson, 1995) the patterns may differ significantly. This study makes use of the extensive geochemical databases for Western Turkey to examine the relative efficiency of the more costly BLEG over the conventional −80# stream sediment fraction in a region with a range of lithologies and deposit types, and extends the orientation work conducted around the Cemalcavus Au-Ag deposit by Yilmaz et al. (2015).
Dispersion of gold and other metals by trees, gravels and soils near Boddington Gold Deposit, Western Australia
2017, Journal of Geochemical ExplorationCitation Excerpt :The in situ nature of the regolith and the slope of the terrain coupled with the downslope bias of the dispersion trains, suggests that mechanical dispersion of material downslope of mineralisation is occurring. This is not an unexpected result, given the terrain gradient, and is consistent with the earlier geochemical studies undertaken by the Geological Survey of Western Australia (Davy, 1979), Smith (1989), Anand (1994) and Beeson (1995) where dispersion trains of several kilometres were noted for some elements in stream sediments. Although there have been considerable data published on regolith materials for Boddington, multi-element data in vegetation have not been published prior to this study.
Discovery of Au-Ag mineralization by stream sediment and soil geochemical exploration in metamorphic terrain in western Turkey
2015, Journal of Geochemical ExplorationCitation Excerpt :In the laboratory, samples for BLEG (− 16 mesh) analyses were leached in 2 l of cyanide solution in a bottle roller, tumbler, with 0.1–0.3% cyanide and either lime or sodium hydroxide, and rolled for 12 h (Yilmaz, 2003). The efficiency for extraction was dependent on cyanide concentration as well as pH, oxygen being available, duration of agitation, particle size, availability of gold and the absence of competing precipitants for gold, for example, organic matter, sulfides, etc. (cf. Beeson, 1995; Mazzucchelli, 1990). The metals, which were leached in 2 l of cyanide solution, were precipitated on zinc powder.
Geochemical exploration for gold in western Turkey: Success and failure
2003, Journal of Geochemical Exploration