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Read Online or Download Recent Advances in Mining and Processing of Low-Grade and Submarginal Mineral Deposits. Centre for Natural Resources, Energy and Transport, United Nations, New York PDF
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Extra info for Recent Advances in Mining and Processing of Low-Grade and Submarginal Mineral Deposits. Centre for Natural Resources, Energy and Transport, United Nations, New York
Example text
There are now some 27 porphyry copper operations in the southwestern part of the United States alone. In addition, new ore bodies have been discovered and drilled out. They are not in production now because of limited smelter capacity. Consequently, anticipated copper resources, constituting both known reserves and paramarginal and submarginal resources, together with new deposits which will be discovered, should supply a large part of industrial requirements of copper for a long time to come, provided new techniques and methods keep pace with demand.
Using the drill hole data, a contour map of the bottom and top of the ore body can be drawn. With this information, a block cave-in place leach plan can be formulated. The most suitable and economical plan would be lateral transfer by scrapers on the control level with belt conveyor haulage. This system allows the undercut to follow the slope of the ore body. For this study, a lUO foot wide panel system, with 20 foot pillars between panels was selected. Slusher drifts on 30 foot centres and draw raises on 17 1/2 foot centres along the slusher drifts were selected.
For this study, a lUO foot wide panel system, with 20 foot pillars between panels was selected. Slusher drifts on 30 foot centres and draw raises on 17 1/2 foot centres along the slusher drifts were selected. With this system a good draw control is obtained and additional pillars can easily be left. Blocks of 150' x l^O1 comprise a unit within the panel. Figures 1, 2 and 3 give details concerning the operation. 5** per sq. ft. mining cost was calculated (Appendix l). Leaching Test leaching of all the exploratory drill holes, cores and leaching tests of underground work should be made.