Supplementary material to "The role of pre-existing jointing on damage zone evolution and faulting style of thin competent layers in mechanically stratified sequences: a case study from the Limestone Coal Formation at Spireslack Surface Coal Mine"

Author(s):  
Billy J. Andrews ◽  
Zoe K. Shipton ◽  
Richard Lord ◽  
Lucy McKay
2020 ◽  
Author(s):  
Billy J. Andrews ◽  
Zoe K. Shipton ◽  
Richard Lord ◽  
Lucy McKay

Abstract. Fault and fracture networks play an important role in sub-surface fluid flow and can act to enhance, retard or compartmentalise groundwater flow. In multi-layered sequences, the internal structure and growth of faults is not only controlled by fault throw, but also the mechanical properties of lithologies cut by the fault. This paper uses geological fieldwork, combined with fault and fracture mapping, to investigate the internal structure and fault development of the mechanically stratified Limestone Coal Formation and surrounding lithologies exposed at Spireslack Surface Coal Mine. We find that the development of fault rock, and complexity of a fault zone is dependent on: a) whether a fault is self-juxtaposed or cuts multiple lithologies; b) the presence and behaviour of shale, which can lead to significant bed-rotation and the formation of fault-core lenses; and c) whether pre-existing weakness (e.g. joints) are present at the time of faulting. Pre-existing joint networks in the McDonald Limestone, and cleats in the McDonald Coal, influenced both fault growth and fluid flow within these lithologies.


Author(s):  
Diana Rodríguez Pérez

Abstract The Iberian archaeological record is particularly rich in asynchronous (i.e. chronologically mixed) assemblages including Athenian pots that predate the other items by a couple of decades or even a few centuries. Recent scholarship on keimëlia, or ‘curated objects’ in modern parlance, has shown the potential of such objects to investigate questions of identity, agency and history-making among the receiving communities, but also to shed light on the role of Athenian pottery among them. This article analyses this phenomenon within the Iberian peninsula, focusing on drinking cups, both black-gloss with inset lip (Cástulo cups) and red-figure type B cups. Using case studies from necropoleis and settlements of the southeast and east of the peninsula, the article explores the reasons and meaning of this consumption practice. It is argued that the occurrence of ‘heirloom’ vases in Iberian tombs and their extraordinary survival in some settlements is the result of a conscious and deliberate choice indicating the existence of mechanisms of social distinction based on a diacritical use of material culture. It is further argued that different motivations might lie behind their delayed deposition: when the chronological gap between production and disposal dates is small, one or two human generations, curated Athenian vases worked similarly to non-curated ones, being emblematic of economic success, social affiliations and political rank. But when the interval is longer, Athenian pots became symbols of ancestry and elite status, possibly acquiring the same legitimizing role earlier bestowed upon Orientalizing artefacts. Supplementary material is available online (https://doi.org/10.1017/S0075426921000094) and comprises a catalogue of case-study objects.


2017 ◽  
Vol 62 (1) ◽  
pp. 105-120 ◽  
Author(s):  
Mousa Mohammadi ◽  
Piyush Rai ◽  
Suprakash Gupta

Abstract Overall Equipment Effectiveness (OEE) has been used since last over two decades as a measure of performance in manufacturing industries. Unfortunately, enough, application of OEE in mining and excavation industry has not been duly adopted. In this paper an effort has been made to identify the OEE for performance evaluation of Bucket based Excavating, Loading and Transport (BELT) equipment. The conceptual model of OEE, as used in the manufacturing industries, has been revised to adapt to the BELT equipment. The revised and adapted model considered the operational time, speed and bucket capacity utilization losses as the key OEE components for evaluating the performance of BELT equipment. To illustrate the efficacy of the devised model on real-time basis, a case study was undertaken on the biggest single bucket excavating equipment – the dragline, in a large surface coal mine. One-year data was collected in order to evaluate the proposed OEE model.


1987 ◽  
Author(s):  
William A. Worrall ◽  
Ann W. Stockman

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