Shaft mining or shaft sinking is excavating a vertical or near vertical tunnel from the top down, where there is initially no access to the bottom. Shallow shafts, typically sunk for civil engineering projects differ greatly in execution method from deep shafts, typically sunk for mining projects.
Types of Shafts Shafts sunk today in hard rock mines are mostly to the standard three compartment timber shaft and the circular concrete shaft. The standard three compartment timber shaft has two hoisting compartments that measure six feet by six feet inside the timbers.
The technical literature is replete with descriptions of and data on shaft sinking equipment, methods and costs. The subject of shaft sinking has been discussed at some length in an earlier Bureau of Mines bulletin. A number of shaft sinking operations are described in detail in the series of information circulars on mining methods and costs, to some of which reference will be made later ...
For abandoned mine shafts, some problems linked to deterioration of the sealing structure at the shaft head, or movement of backfilling material in the shaft have been observed. It is also common to find mine shaft opened even decades after mining activity. With time, it is also possible that mine shafts be localisable only
Shaft Mining Shaft mining is a form of underground mining where shafts are pushed vertically from top to bottom to excavate the ores and minerals. It is also called shaft sinking. It is best suited for concentrated minerals such as iron, coal, etc. which can be found at the depth of the earth39;s surface.
In addition to all this shaft sinking activity, coal mining continued to attract attention in Nova Scotia, and over 100 new coal mines were opened in that province during the 1900 to 1940 period. Shafts in this area tended to be relatively shallow, however, generally less than 800 feet deep.
Conventional mine shaft sinking methods involve the performance of a cycle of different operationsdrilling and blasting, removal of smoke and cleaning of fly rock lodged on overhead timbers, mucking and hoisting of the broken rock, and timbering. The latter may be the last operation of the cycle, may be carried on during drilling and mucking, provided it is done from a substantial ...