Mining or in situ disintegration of hard material – Processes
Patent
1989-08-14
1991-04-16
Britts, Ramon S.
Mining or in situ disintegration of hard material
Processes
175219, 299 19, E21C 3516, E21C 4100, B66B 1704
Patent
active
050076833
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method and an equipment for using, in connection with narrow ore mining, shrinkage stoping technique with a working equipment, such as a working platform or mining rig suspended on guide rail sections in the roof of the mining chamber, from which working platform or mining rig drilling and charging is carried through, and which before blasting is moved into a raise leading to the mining chamber.
In several places in the world there are great ore deposits in the form of narrow ore bodies containing high grade ore. Due to the lack of economically acceptable techniqiue these ore deposits have hitherto been taken care of to a very small extent. The ore bodies referred to here have, by way of definition, a width of an order of magnitude of 4-5 meters at most, and they can have a great extension in the height and length directions. Furthermore, it has turned out that the planes of these thin ore bodies to a very great extent lean 45.degree.-90.degree. with respect to the horizontal, with a concentration to the area 60.degree.-70.degree..
In the Swedish patent 333,342 a mining method is described, which nowadays is usually called "mechanized shrinkage stoping", and which is used for broader ore bodies. Mining is carried through by means of a mining rig which is suspended on guides in the roof of the rock chamber, and from which drilling and charging is carried through. The guides being successively mounted in the roof of the rock chamber from the rig, continuously continue via a rounded off transition into a raise into which the mining rig is driven before blasting. Mining with horizontal drilling is carried through successively from the raise to the end of the rock chamber located at most remote from the raise. After finished horizontal mining, mining with vertical or close to vertical drilling is started from this end back toward to the raise.
The method just described has the great advantage as compared with conventional shrinkage stoping that the loosened ore need not be used as a platform for mining equipment and personal. Thereby the economical gain is considerably increased since removal of the ore is not dependent from the ore excavation.
The object of the present invention is to provide a method and equipment, by means of which mining of narrow ores becomes technically and economically practicable.
The invention is based upon the realization that the following principles shall be followed in order to attain this object: body shall not, as higherto, be reached via an intermediate drift system, the installation of which requires considerable amount in investment. to be carried through simultaneously and in independent operation. a time period of a total of 6-7 years, shall be limited only to concern mainly determination of principally the approximate limits and extensions of the ore body. Instead the mining equipment shall be so designed and adapted that it enables that the ore body is followed mainly independently of its mainly unknown variation with respect to thickness, inclinations, windings and possible faults.
According to one aspect of the invention a method is used, that resembles the above described mechanized shrinkage stopping technique and thereby provides the advantages connected therewith. It should, however, be emphasized that said technique is based upon use of equipment that requires great space and shall be able to be driven on one and the same continuous guide system in the roof of the rock chamber and the raise. This known technique and equipment are completely unuseable when it is the question of narrow ore bodies with a width of 4 meters at most, the planes of which lean by an angle of an order of magnitude of 60.degree.-70.degree. to the horizontal, and which normally have many windings and possibly faults along their extensions.
By using, according to the invention, in the raise following the inclination of the ore body, a transport lift designed for receiving the working platform or mining rig in the lift cage, adaption of the size of the working
REFERENCES:
patent: 3068654 (1962-12-01), Warren
patent: 3731976 (1973-05-01), Granskog et al.
patent: 4053182 (1977-10-01), Nelson
patent: 4132276 (1979-01-01), Svenson
patent: 4254994 (1981-03-01), McBride
Alimak AB
Bagnell David J.
Britts Ramon S.
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