Harris Creek is a Au-rich, cobble-gravel bed stream in southern British Columbia, Canada. A preliminary study, based on analysis of < 0.053 mm sediments and heavy mineral concentrates (SG > 3.2) from bulk sediment samples, identified accumulations of Au at breaks-in-slope of the stream gradient. This is consistent with theoretical models of heavy mineral transport by streams (Day and Fletcher, 1991). However, the breaks-in-slope also coincide with active landslides that might, because of the form of the Au anomalies, be interpreted as the source of the Au. To investigate this we have: (1) monitored erosion of the landslides and determined their Au content; and (2) used multi-element geochemistry (with Al, Mg, Na, Ba, Ti, P and Sr) to fingerprint the influence of one of the landslides on the composition of the < 0.053 mm fraction of the stream sediments.

Modern amphibians - the familiar frogs and salamanders of the Northern Hemisphere and the less well-known, elongate, and limbless caecilians of the Southern Hemisphere-appear as relatively minor components of the living fauna, although they actually outnumber the dominant mammals in terms of both numbers of species and individuals. In fact, the three modern amphibian groups are but relicts of a much larger radiation that occurred between 370 and 270 million years ago, when their ancestors dominated terrestrial and shallow water environments throughout the world. Of even greater significance, the early amphibians provided an evolutionary link between archaic fish and the ancestors of all more advanced terrestrial vertebrates: the reptiles, birds, and mammals. That is, they were our own <...>

The science of rock physics addresses the relationships between geophysical observations and the underlying physical properties of rocks, such as composition, porosity, and pore fluid content. The Rock Physics Handbook distills a vast quantity of background theory and laboratory results into a series of concise, self-contained chapters, which can be quickly accessed by those seeking practical solutions to problems in geophysical data interpretation.

Assessment of geological, geochemical and isotopic data indicates that a significant subgroup of volcanichosted massive sulphide (VHMS) deposits has a major or dominant magmatic–hydrothermal source of ore fluids and metals. This group, which is typically characterised by high Cu and Au grades, includes deposits such as those in the Neoarchean Doyon-Bousquet-LaRonde and CambrianMount Lyell districts.