![]() ![]() Pleth and He measurements of lung volume and by thoracic CT scans obtained during breath hold at full inspiration. Methods: We measured total lung capacity (TLC) in 1. We sought to compare plethysmography (Pleth)-, helium dilution (He)- and CT scan- derived lung volume measurements in a sample containing many patients with severe airflow obstruction. Background: Theoretical considerations and limited scientific evidence suggest that whole- body plethysmography overestimates lung volume in patients with severe airflow obstruction. Parametric numerical modeling Ore dilution Rock mechanics Underground mining Hanging- wall reinforcement Stope type Stope case study.Ĭomparison of Plethysmographic and Helium Dilution Lung Volumes. ![]() The study illustrates relationships between measured hanging- wall overbreak, cablebolt orientation and stope type. Furthermore, a case study is presented to demonstrate the role cablebolts installed in the stope hanging- wall play to control ore dilution. ![]() Measured overbreak varies with stope type, with secondary stopes generating a greater volume of hanging- wall dilution than do primary stopes. Five stope types were identified, based on their position within a tabular blasthole mining sequence. Through a review of the case studies, it was demonstrated that, in addition to stope dimension, the amount of unplanned dilution differed according to stope type. For the study, a comprehensive database was established, incorporating information related to the design, construction, excavation and cavity surveys of 1. This paper presents the results of an examination of factors influencing ore dilution in a blasthole stoping environment. Unplanned ore dilution has a direct and large influence on the cost of a stope, and ultimately on the profitability of a mining operation. ![]() This paper presents the.Īssessment and Control of Ore Dilution in Long Hole Mining: Case Studies. Russell Elliott, provides quality land surveys, property boundary surveys, subdivision surveys, mortgage surveys, topographic maps and construction surveys.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
February 2023
Categories |