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With the removal of the majority of the shallow mineral reserves there has been an increase in the mining depths in the South African mining industry. This has, in turn, changed the industry’s and stakeholders’ perceptions of risk associated with mining-induced instability. In recent years the increased mining depth, particularly in open pits, has led to an increase in pit slope failures, which has highlighted the need for appropriate and effective pit slope management programmes. Such a programme comprises many facets, including mine hazard plans, regular slope inspections, cleaning of interim and final pit faces, blasting practices, histories of failures, pit depressurization, stormwater control and evacuation procedures. However, it is arguably in the field of slope monitoring that the most significant strides have been made in terms of new technologies and best practice in open pit mining geotechnics, with the introduction of technologies such as laser scanners and slope stability radar. This paper seeks to illustrate the operational benefits associated with the implementation of new technologies into open pit mining, using AngloGold Ashanti’s Geita Gold Mine in Tanzania as an example. <...>
Many geostatistical variables have sample distributions that are highly positively skewed. Because of this, significant deskewing of the histogram and reduction of variance occurs when going from sample to block support, where blocks are of larger volume than samples. When making estimates in both mining and non-mining applications we often wish to map the spatial distribution on the basis of block support rather than sample support.
Das Binntal ist ein wahres Eldorado für Mineraliensammler und -liebhaber. Es gibt wohl kein anderes Gebiet in den Alpen, welches so vielseitige und weltweit einzigartige Vorkommen auf engstem Raum aufweist, wie dieses vom Massentourismus noch weitgehend verschonte Alpental. Hinzu kommt noch eine besonders artenreiche und üppige Flora, welche sich hier auf äußerst abwechslungsreichen Gesteinen entwickeln konnte.
Since fossil vertebrates were first discovered at Porcupine Cave on the rim of South Park, Colorado, in 1981, the site has become the world’s most important source of information about animals that lived in the high elevations of North America in the middle part of the ice ages, between approximately one million and 600,000 years ago. Beginning in 1985, teams of scientists and volunteers from three major research institutions —the Carnegie Museum of Natural History, the Denver Museum of Nature and Science, and the University of California Museum of Paleontology—spent some 15 field seasons excavating and studying tens of thousands of fossil specimens that have opened a window onto past evolutionary and ecological adjustments. This window into the past allows us to visualize how ongoing global change could affect our living communities. This book reports the results of nearly two decades of research and has been written to appeal to three overlapping audiences
AUSTIN, W. E. N. & JAMES, R. H. Biogeochemical controls on palaeoceanographic environmental proxies: an introduction
JAMES, R. H. & AUSTIN, W. E. N. Biogeochemical controls on palaeoceanographic environmental proxies: a review
WILLIAMS, R. J. P. Some fundamental features of biomineralization
ZEEBE, R. E., BIJMA, J., HOЁ NISCH, B., SANYAL, A., SPERO, H. J. &WOLF-GLADROW, D. A. Vital effects and beyond: a modelling perspective on developing palaeoceanographic proxy relationships in foraminifera
PEARSON, P. N. & BURGESS, C. E. Foraminifer test preservation and diagenesis: comparison of high latitute Eocene sites
Vascular land plants have been evolving for over 425 million years. During that long period they have adapted to survive a remarkably wide range of both physical and chemical conditions.
The basic structural building block of the biomarkers is the isoprene unit (Figure 1A). The end closer to the methyl branch is called the "head/' and the other end is the "tail." Compounds formed biosynthetically from isoprene units are called "isoprenoids." Two isoprene units joined head-to-tail (with minor modifications, such as hydrogenation of double bonds) form a monoterpane (Figure IB). Two monoterpanes (four isoprene units) linked together form a diterpane, whereas six isoprene units can be joined either to form a sterane or a triterpane, depending upon how the linking is accomplished.
La Société Lafarge Ciments exploite depuis 1964 de grandes carrières dans le Beaujolais méridional, sur le territoire des communes de Belmont, Charnay et Saint-Jean-des-Vignes. Les travaux d’exploitation ont mis au jour des dépôts datés de l’Hettangien au Bathonien. Parmi ceux-ci, les sédiments toarciens, aaléniens et bajociens, particulièrement fossilifères, ont très tôt attiré l’attention des chercheurs amateurs et professionnels.
Pollen, diatom and foraminiferal analyses of a nearly complete Mikulino/ Eemian interglacial marine sequence in Petrozavodsk, Russian Karelia, is presented together with a comprehensive literature review of Mikulino biostratigraphical data in NW Russia earlier published mostly in Russian. Mikulino interglacial deposits have been investigated in numerous sites, and, similarly, palaeohydrology and duration and correlation of different phases of the Mikulino marine submergence in this region have also been under discussion in several papers.
Mud resistivity can be verified using the BKZ curve using the non –permeable interval with interval thickness / Bit Size > 16 and RT considerably higher than Mud resistivity. BKZ departure curve is plotted on logarithmic transparency together with Bit Size constant vertical line (X axis AO/BS, Y axis Rapp/Rm). Bit size constant is overlaid with BS line on No-Invasion chart for appropriate device type (lateral or normal) The transparency is moved vertically along the BS line on the chart until the BKZ curve is matched with the chart (specifically the left part of the curve ) Verified RM is defined as the Y value of the transparency grid crossed by Rapp / Rmud = 1 line (chart cross). Mud resistivity value is read from the transparency grid, RT defined as Y value on the chart grid where the BKZ measurement curve crosses the A line on the chart