Colin R. Ward
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A suite of allotaxonometric tools for the comparison of complex systems using rank-turbulence divergence Open
Describing and comparing complex systems requires principled, theoretically grounded tools. Built around the phenomenon of type turbulence, allotaxonographs provide map-and-list visual comparisons of pairs of heavy-tailed distributions. Al…
Testing of Interactions between Coal Ash Leachates and Rock Materials for Mine Backfill Evaluations Open
A series of laboratory-based leaching tests has been developed to evaluate the chemical interaction between ash, water and different mine-site rock materials, as a basis for assessing the potential environmental impact of using coal ash as…
Mineralogical Transformations in Coal Feedstocks during Carbon Conversion, Based on Packed-Bed Combustor Tests Open
Mineralogical and inorganic geochemical studies have been carried out on composite samples of six different coarse-crushed (,120 mm) feed coals tested in a pilot-scale packed-bed combustor designed to simulate conversion and some fixed-bed…
SEM-EDS imaging of multi-stage cleat minerals formation in the South Walker Creek Coals, Bowen Basin Open
The South Walker Creek coals are moderately to highly developed fracture systems. These fractures can be recognized from the top to the bottom of the seam, with both open and closed apertures. They are filled with several different mineral…
Organic associations of non-mineral elements in coal: A review Open
Coal, one of the most complex geological materials, consists of organic and mineral matter, the latter including crystalline minerals, non-crystalline mineraloids, and elements with non-mineral associations. Overall, the modes of occurrenc…
Mississippian anthracites in Guangxi Province, southern China: Petrological, mineralogical, and rare earth element evidence for high-temperature solutions Open
Minerals and elements in coal are derived from the processes associated with peat accumulation and rank advance, as well as possibly a range of epigenetic processes, and thus can provide information on the depositional conditions and geolo…
The occurrence of buddingtonite in super-high-organic-sulphur coals from the Yishan Coalfield, Guangxi, southern China Open
This paper discusses the identification, abundance, modes of occurrence and origin of buddingtonite and associated minerals in three Lopingian coals from the Yishan Coalfield, Guangxi Province, southern China. The coals of this coalfield a…
View article: Correction: Corrigendum: Earliest signs of life on land preserved in ca. 3.5 Ga hot spring deposits
Correction: Corrigendum: Earliest signs of life on land preserved in ca. 3.5 Ga hot spring deposits Open
Nature Communications 8: Article number: 15263 (2017); Published: 9 May 2017; Updated: 16 August 2017. The original manuscript presented evidence that the deposits studied were fluvial rather than marine to support the conclusion that evid…
Field level digital mapping of soil mineralogy using proximal and remote‐sensed data Open
Primary (e.g., quartz) and secondary (clay) minerals are key factors determining the physical and chemical characteristics of soil. Understanding spatial distribution of minerals at the field scale would, therefore, be of potential benefit…
After the Tide: Commodity Currencies and Global Trade Open
The decade prior to the Great Recession saw a boom in global trade and rising transportation costs. High-yielding commodity exporters׳ currencies appreciated, boosting carry trade profits. The Global Recession sharply reversed these trends…
Determination of mineral matter and elemental composition of individual macerals in coals from Highveld mines Open
A number of conventional and advanced analytical techniques (proximate and ultimate analysis, low-temperature oxygen-plasma ashing, X-ray diffraction, X-ray fluorescence spectrometry, coal petrography, and light-element electron microprobe…