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Covers the history of the 48 year existence of Brunswick Mine, one of the world's largest underground lead-zinc mines. Discovered in 1952, with production beginning in 1964, this large massive sulphide ore body has extracted more than 136 million tonnes of ore from its No. 12 orebody and 13 million tonnes from its No. 6 open pit, and processed another 0.2 million tonnes of custom mill feed. Brunswick Mine's concentator has processed approximately 150 million tonnes of ore grading 8.77% zinc, 3.45 lead, 0.37% copper, and 102 g/t silver and transitioned through four major changes in ownership, Brunswick Mining and Smelting Corporation Limited, Noranda, Falconbridge, and finally Xstrata.
The collection is composed of two letters regarding the transfer of property over to the Unevida Gold Mining Company; two maps of the Brunswick Consolidated mine; a description of the Alturas mine; a statement of receipts, disbursements and liabilities; statements of assay certificate values; and other financial account statements.
This proceedings volume showcases all aspects of the science and engineering of mine ventilation and health and safety, with special focus on the applied aspects of mine ventilation practice. Papers span the spectrum of mine ventilation and air conditioning.
The perturbation of the earth by mankind causes earthquakes in a variety of situations. This phenomenon continues to be a major concern to engineers and scientists concerned with the mitigation of the consequences of this seismicity, as well as better understanding the processes at its origin. The present volume contains twelve papers from six countries, dealing with observations of triggered and induced seismicity in four continents. The reported cases include seismicity due to hard-rock mines, coal mines, underground research facilities for nuclear waste disposal, water injections, reservoirs, acquifers and oil fields. This volume provides case studies of previously unavailable observations of this phenomenon, investigations of the cause and source mechanism of seismic events, studies of source location distributions, determinations of seismic source parameters, cases of the use of such parameters in assessing rockburst hazard in mines, and measurements of velocity an attenuation properties of rock masses. The present collection of papers provides an excellent indication of the current state of the art and new developments in this area of research.