Ayesha Ahmed

Statistical techniques for leveraging geochemical data in ore and non-ore characterization for mining and environmental stewardship

Ayesha Ahmed, Kerry M. Byrne, Regula Baumgartner, I. Dalrymple

The timeline from exploration through to extraction of a mineral deposit often spans decades, resulting in multi-generational geochemical data collected utilizing a variety of digestion and analytical methods. To extract value from these diverse datasets is challenging. This is due to lack …

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Tourmaline Mineral Chemistry: A Fertility Assessment and Vectoring Tool for Mineral Exploration in Magmatic-Hydrothermal Ore Systems

Wei Hong, Francisco Testa, David R. Cooke, Nathan Fox et autres

Abstract Tourmaline is a structurally and chemically complex hydrous borosilicate mineral that displays significant compositional variability in both major and trace elements. Its occurrence in a wide variety of ore-forming systems makes tourmaline a powerful provenance indicator because it can record the …

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Unsupervised clustering of LA-ICP-MS raster map data for geological interpretation: A case study using epidote from the Yerington district, Nevada

Ayesha Ahmed, Shawn B. Hood, David R. Cooke, Ivan A. Belousov

Raster element concentration maps created using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) can be used to interpret microscale compositional and textural domains within mineral grains. Raster maps are typically evaluated element by element; however, application of statistical techniques (such as …

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A Microscale Analysis of Hydrothermal Epidote: Implications for the Use of Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry Mineral Chemistry in Complex Alteration Environments

Ayesha Ahmed, Louise A. Fisher, Mark A. Pearce, A Escolme et autres

Abstract High-resolution, quantitative imaging of epidote from the Ann Mason fault block, Yerington district, Nevada, using scanning electron microscopy (SEM), X-ray fluorescence (XRF), and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) has revealed at least two types of epidote (type 1 and type …

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Recent advances in the application of mineral chemistry to exploration for porphyry copper–gold–molybdenum deposits: detecting the geochemical fingerprints and footprints of hypogene mineralization and alteration

David R. Cooke, Paul Agnew, Pete Hollings, Michael J. Baker et autres

In the past decade, significant research efforts have been devoted to mineral chemistry studies to assist porphyry exploration. These activities can be divided into two major fields of research: (1) porphyry indicator minerals (PIMs), which are used to identify the presence of, …

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Assessing copper fertility of intrusive rocks using field portable X-ray fluorescence (pXRF) data

Ayesha Ahmed, Anthony J. Crawford, Christopher Leslie, Joshua Phillips et autres

Based on a global compilation of whole-rock geochemical data, Sr/Y and Sr/MnO are identified as effective discriminators between ore-forming and unprospective intrusions in the porphyry Cu setting. Intrusive rocks are classified into three fertility groups – prospective, unprospective and mixed-signal – designed …

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Assessing copper fertility of intrusive rocks using field portable X-Ray fluorescence (pXRF) data

Ayesha Ahmed, Anthony J. Crawford, Christopher Leslie, Joshua Phillips et autres

Appendix A. pXRF and ICP Standards Data.

Assessing copper fertility of intrusive rocks using field portable X-Ray fluorescence (pXRF) data

Ayesha Ahmed, Anthony J. Crawford, Christopher Leslie, Joshua Phillips et autres

Appendix B. Raw and ICP-calibrated pXRF data.

Assessing copper fertility of intrusive rocks using field portable X-Ray fluorescence (pXRF) data

Ayesha Ahmed, Anthony J. Crawford, Christopher Leslie, Joshua Phillips et autres

Appendix A. pXRF and ICP Standards Data.

Assessing copper fertility of intrusive rocks using field portable X-Ray fluorescence (pXRF) data

Ayesha Ahmed, Anthony J. Crawford, Christopher Leslie, Joshua Phillips et autres

Appendix B. Raw and ICP-calibrated pXRF data.

Interpreting element addition and depletion at the Ann Mason porphyry-Cu deposit, Nevada, using mapped mass balance patterns

Ayesha Ahmed, Shawn B. Hood, Michael F. Gazley, David R. Cooke et autres

au (code pays fourni par la source)

Beyond the confines of the ore deposit : mapping low temperature hydrothermal alteration above, within, and beneath Carlin-type Gold deposits

Ayesha Ahmed

Multiple analytical techniques were employed to investigate distal patterns in low temperature hydrothermal fluid flow into and out of Carlin-type gold deposits in two study areas: the Leeville deposit and the Shoshone range including the Pipeline, Gold Acres and Elder Creek deposits. …