Open pit mining for tar sands

Details Open pit mining for tar sands Open pit mining for tar sands

E - Fixed Constructions

21

C

262/6

E21C 41/26 (2006.01)

Patent

CA 1132147

- 1 - Abstract: The layout of an open pit mine for tar sands ore facilitates the handling of the ore by employing two or more cuts that diverge from each other while extending away from a common dump adjacent a processing (extraction) plant. Successive parallel and adjacent strips of overburden and ore are removed, whereby each cut is widened and deepened. As a result, each adjacent pair of cuts open to a common track. Initially, this takes place in the vicinity of the dump, but, as mining proceeds a track (or ramp) is formed that is common to the two cuts while leading from each cut to the dump. This provision of a common track shortens the haulage routes involved. The ore is mined with large power shovels and loaded into large trucks, this equipment working down on the ore body. For stability, a firm surface (roadway) is formed on the ore to support the shovels and trucks. A major advantage of the system is flexibility of movement between pits and lack of restriction in mining depth and much improved ability to separate ore and reject. The handling of tailings is also substantially facilitated, and the over- all capital cost of a large scale installation, as well as the operating and maintenance costs, can be expected to be hundreds of millions of dollars cheaper than an installation of the same capacity constructed in the conventional manner.

343501

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