volume of the bronchial tree at various levels and its possible physiologic significance', Ann.Influence of bronchial tree structure on ventilation in dog lung inferred from measurements of a plastic cast', Lead was one of the seven metals of antiquity. Its discovery dates back to at least 3500 B.C. and lead artefacts have been discovered widespread throughout the ancient world. Lead does not o...

Purpose. In order to fully exploit the metal and facilitate its method of processing, we need an accurate knowledge composition, granular distribution, association with unimportant penalizing elements that would like get rid of, compared distribution element extract by flotation method. Methodology. The present experimental work proposes approach mineralogical, chemical particle size characteri...

21 kilometres north of Stewart (Figure 2-IZ-l), on the east The Silbak Premier mine is in northwest British Columbia, side of the Salmon River Valley. The original discovery of a that from 1918 to 1953 produced 4.3 million tonnes of ore high-grade vein in 1910 culminated in an underground mine grading 14.6 grams gold and 304 grams silver per tonne from sulphide-bearing stockworkveins and brecci...