Shaft mining rock drill video tutorial

How do you deepen a shaft in a rock formation?

In ordinary shaft sinking in rock formations, the shaft is deepened by drilling rounds of holes in accordance with a standard arrangement. The holes are loaded and blasted in a sequence designed to obtain maximum breakage with a given amount of explosive.

What is a mine shaft sinking method?

Conventional mine shaft sinking methods involve the performance of a cycle of different operations—drilling and blasting, removal of smoke and cleaning of fly-rock lodged on overhead timbers, mucking and hoisting of the broken rock, and timbering.

What type of drilling is used for ventilation shafts?

The method is most commonly used to provide small diameter ventilation shafts which are required for relatively short periods (and therefore can be left unlined). Blind boring – a shaft is excavated using normal drilling techniques with a very large diameter bit.

How is a shaft excavated?

Blind boring – a shaft is excavated using normal drilling techniques with a very large diameter bit. Drilling muds would normally be used to remove the cut stone and to support the side walls (permanent support could be difficult to install until excavation is completed).

What is a mine shaft sinking job?

At an active mine the mechanical, drill-sharpening, and carpenter work usually can be handled by the regular mine staff. Some shaft-sinking jobs entail starting from surface and involve clearing and preparing the site and installing a shaft collar and head-frame, whereas others are merely deepening operations.

How can a coal mine handle excavated material?

For the other two methods, the mine must be developed to the shaft location and the mine's haulage system must be able to handle the excavated material either separately from the coal stream or by separating the material in the coal preparation plant. In rare cases it may be possible to dispose of the material in old workings underground.