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In this paper we describe a field trial designed to investigate the potential of remote, situated messaging within the home. Five households used our "HomeNote" device for approximately a month. The results show a diversity of types of communication which highlight the role of messaging both to a household and to a place. It also shows the ways in which these kinds of messages enable subtle ways of requesting action, expressing affection, and marking identity in a household - communication types which have received little attention in the research literature. These in turn point to new concepts for technology which we describe. © Copyright 2006 ACM.

The grade-gradient curve is a powerful tool for the analysis of mineral separation by flotation, but its elegance is diminished for complex separations. A computer program has been written to determine the technical and economic separation optima without drawing the curve. The parameters for kinetic models of flotation are determined from experimental data. The grade-gradient curve is generated using the models and technical and economic optima are determined, with flotation time as a hidden variable in both cases. To take account of the precious metals often associated with base metal concentrates, the concept of neutral concentrate grade is extended for a polymetallic concentrate to mean the base metal grade for which smelting and refining costs equal the value of metals contained in the concentrate., The grade-gradient curve is a powerful tool for the analysis of mineral separation by flotation, but its elegance is diminished for complex separations. A computer program has been written to determine the technical and economic separation optima without drawing the curve. The parameters for kinetic models of flotation are determined from experimental data. The grade-gradient curve is generated using the models and technical and economic optima are determined, with flotation time as a hidden variable in both cases. To take account of the precious metals often associated with base metal concentrates, the concept of neutral concentrate grade is extended for a polymetallic concentrate to mean the base metal grade for which smelting and refining costs equal the value of metals contained in the concentrate.

Individual ball mill circuit design and operating variables can be related to overall circuit performance through two distinct parameters for classification and breakage. The ball mill circuit functional performance equation is presented. It is applied to the grinding circuits at Les Mines Selbaie, where influx of both fines and additional water from the crushing plant were seen to offset each other leading to little change in classification, breakage or overall circuit efficiency; to the gold circuit at Dome, where high water usage contributes directly to high circuit efficiency through a positive impact on classification efficiency; and at Kidd Creek solids percentage in the ball mill was an important factor., Individual ball mill circuit design and operating variables can be related to overall circuit performance through two distinct parameters for classification and breakage. The ball mill circuit functional performance equation is presented. It is applied to the grinding circuits at Les Mines Selbaie, where influx of both fines and additional water from the crushing plant were seen to offset each other leading to little change in classification, breakage or overall circuit efficiency; to the gold circuit at Dome, where high water usage contributes directly to high circuit efficiency through a positive impact on classification efficiency; and at Kidd Creek solids percentage in the ball mill was an important factor.

A new analytical approach for characterising and improving the performance of ball milling is presented. Individual ball mill circuit design and operating variables can be related to overall circuit performance through two distinct parameters for classification and breakage. The ball mill circuit functional performance equation is presented. Applications in the industrial plant and in the research field are discussed., A new analytical approach for characterising and improving the performance of ball milling is presented. Individual ball mill circuit design and operating variables can be related to overall circuit performance through two distinct parameters for classification and breakage. The ball mill circuit functional performance equation is presented. Applications in the industrial plant and in the research field are discussed.

The tailings disposal system at Les Mines Selbaie includes dewatering of tailings in a high-capacity thickener, followed by point discharge of the thickened solids to form a stable conical pile. Tailings water drains to ponds formed behind engineered dams, prior to either recycling for process use or discharge to the environment. Design and economic considerations of the system are discussed. Construction, start-up and operating experiences are also presented., The tailings disposal system at Les Mines Selbaie includes dewatering of tailings in a high-capacity thickener, followed by point discharge of the thickened solids to form a stable conical pile. Tailings water drains to ponds formed behind engineered dams, prior to either recycling for process use or discharge to the environment. Design and economic considerations of the system are discussed. Construction, start-up and operating experiences are also presented.