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Author: Admin | 2025-04-28
Hale, R. Ottesen, P. Theobald, A. Bjorklund, R. Mazzucchelli, R. Lett and K. Fletcher. BLEG work acknowledges the development work of W. Griffin, N. Radford, O. Lavin, K. Arndt and S. Marshall. We thank Newmont for permission to publish some details of the Newmont customized BLEG procedures which transitioned from Normandy to work by the Newmont geochemistry team. Thank you as well for advice for this article from B. McClenaghan, R. Eppinger and to the GEEA reviewers. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the US Government. Author contributions MED: writing – original draft (lead); KA: writing – original draft (equal); ZC: writing – original draft (equal); KK: writing – original draft (equal); OL: writing – original draft (equal). Funding This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors. Competing interests The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Data availability The datasets generated during and/or analysed during the current study are not publicly available because confidential company data were used to generate representative map styles. Data sharing is not applicable to this article as this is a review article and no new datasets were generated or analysed during the current study. Data & Figures Fig. 1Diagrammatic representation of various grain sizes and the scales typically used to measure grain size. Grains are represented at c. 300× actual size. Source: modified from Wentworth (1922).Fig. 1Diagrammatic representation of various grain sizes and the scales typically used to measure grain size. Grains are represented at c. 300× actual size. Source: modified from Wentworth (1922). Fig. 2.Example of field duplicates from a bulk leach extractable gold (BLEG) survey (Newmont customized method). Two samples were taken from the same sample locations but a separate field collection and different sample bags were used. Samples were collected as part of a routine 400 sample BLEG survey in Africa.Fig. 2.Example of field duplicates from a bulk leach extractable gold (BLEG) survey (Newmont customized method). Two samples were taken from the same sample locations but a separate field collection and different sample bags were used. Samples were collected as part of a routine 400 sample BLEG survey in Africa. Fig. 3.Map of gold in stream sediment samples represented by the display type ‘bubble plot’. Larger bubbles and hotter colours indicate higher gold concentrations. (As the data are proprietary, legend, location and map orientation information are not provided.)Fig. 3.Map of gold in stream sediment samples represented by the display type ‘bubble plot’. Larger bubbles and hotter colours indicate higher gold concentrations. (As the data are proprietary, legend, location and map orientation information are not provided.) Fig. 4.Map of gold in stream sediment samples represented by display type ‘catchment polygons’. Hotter colours indicate higher concentrations of gold. (As the data are proprietary, legend, location and map orientation information are not provided.)Fig. 4.Map
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