Ore passes

Dry soHds, such as as-rnined ore, emshed ore, and dried concentrates, are transported using tmeks, rail cars, ore passes, conveyor belts (see Conveying), or slurry pipelines (qv) as dictated by the logistics, distances involved, and capacity. Within the mill, conveyor belts are more common, but for fine particles, tailings, and coal, slurry transportation is more typical. 

Transfer A vertical or inclined connection between two or more levels and used as an ore pass. 

Finally it was the LCC- analyzes that showed that the best feasibility would be achieved by building a conventional main level where driverless trains made the horizontcd ticuisportation of the ore from groups of ore passes to dumping stations and with a conventional skip hoisting system to the surface. 

Between 1338 and 1365 a vertical bin with 7 m diameter is built in order to avoid the ore pass to go empty during production. In the bottom of each bin a NMT (Nordic Mine Technology) hydraulic chute is installed for filling the trains. The operator controls the speed and direction of the trains and uses both the moveable curtain boom and the chute lip movement to get the right flow of ore into the Ccffs. 

As more areas of the chute come in contact with the ore, higher maintenance requirements are expected. The frequency of maintenance associated with the mechanical equipment is based upon the tonnes of ore passed through any piece of equipment in a given time period. Dual conveyors, for instance, pass half the tonnage required of a single conveyor in the same time period hence the amount of wear on the equipment is significantly reduced. 

Jones and Wagener Proposal for the Calculation of Pressures to be used in the Design of Box Fronts at the Bottom of Inchned Ore Passes, Jones and Wagener Report No G57/92/4249, Johannesburg, 1992. 

A third method of leaching is possible, based upon the counter-current principle. A series of vessels can be used in which acid passes from one vessel to another through the series in one direction whilst ore passes relatively in the opposite direction. Several different transfer patterns are possible, depending upon whether the solid or liquid is moved from vessel to vessel or whether both are moved simultaneously. Figure 2.2 shows such a pattern based upon the assumption of liquid-phase movement only,... 

The ore passes continuously through the inner tube while the outer tube is heated. When the mercury vapor has been condensed, air is forced through the hot metal melt Contamination of iron, copper, zinc and lead will be oxidized and form a slag on the surface. For special purposes the mercury is purified by a further distillation. 

The paper presents design, control and functional aspects of an application specific heavy duty telemanipulator for operations In hazardous mining areas which are either Inaccessible or Involve high risk to human life. One of the problems faced In a typical copper mine Is the Jamming of ore pass tunnel due to uneven ore boulders The manipulator performs the Implantation of dynamite cartridges In the boulder(s). The designed manipulator Is semiautomatic and has seven degrees of freedom and Is controlled from a remotely located control room ... 

The Jam takes place within 15 meters from the bottom of the pass and the total weight of the Jammed ore Is around 60-80 tons The diameter of the ore pass ranges from A meters to 6 meters and has loose and uneven terrain The Jam Is cleared by blasting the Jammed boulder(s) The manipulator Is required to enter from bottom of the ore pass, access the Jammed location, scan the area, locate the weak points In the Jammed boulder(s) with the operator s assltance, drill holes at the Identified points. Implant dynamite cartridges, and return back to the safe area ... 

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