Cartridge - An individual closed shell, bag, or tube of circular cross section containing explosive material. Cartridge Count (Stick...

Air Blast - the airborne shock wave or acoustic transient generated by an explosion. Ammonium Nitrate - The ammonium salt of nitric acid...

If there is hard sand stone in the roof or if roof does not comes down timely and hanging at roof at long time these type of hanging roof...

When a roof fall takes place, the air in the goaf area is displaced as the latter is filled by the broken roof rocks. The displacement is...

Bumps in Coal Mines: Coal bumps generally occur in deep mines. These are sudden violent bursts of coal from pillars, usually accompanied...

The indications available of roof weight are coming down over mine opening can be sense by - 1. The prop, when tapped with a stick,...

Local Fall - This is also called as first roof fall. In this type of fall the lower strata of immediate roof separate and fall in the...

While working with caving system in depillaring district roof falls after some time when supports are withdrawn from the faces, this type...

Production blasting is designed to fragment rock for loading. At the slope wall, this fragmentation results in backbreak, which reduces...

Bore Hole Deviation Deviation from required/set course of action known as Bore Hole Deviation . It is significant when it's more than >2⁰...

Chapman-Jouquet plane for Rock Breakage 🪨 🪨 🪨 🪨🪨 🪨 🪨 🪨 The space is Bounded by two infinite planes. Exploded region(shock wave)...

PRODUCTIVITY pro·duc·tiv·i·ty Latin Origin /ˌprōˌdəkˈtivədē Productivity is the commonly relation between the output volume and the...

•Flameproof Apparatus:- Flameproof Apparatus means an electrical apparatus - whose electrical parts that can ignite an explosive...

Heinrich Theory In 1931, H.W. Heinrich was the first who view mine accidents in scientific way. He analysed some 75000 accidents and give...

Line of extraction is the line or plane along which the roof breaks occurs easily when the depillaring or coal pillar are extracted....

•Bolt acts on the basis of three principles:- 1) Suspension effect:-. The immediate layers of roof are held by anchorage(लटकाना) from a...

When a moving coloum of water is suddenly come to rest then it begins to stroke the various of the pump. The pump is liable to brake...

Methane Explosibility Curve If you want to find out the flammability of methane-air mixtures, explosibility curve of methane is extremely...

AXIAL FLOW FAN It consists of a shaft with a hub (Boss). A number of blades are attached to the hub. The salient constructional features...

BLOWN OUT SHOT A shot in which the explosive brings down no coal, the main force being expended on the air of the mine BLOWN OUT SHOT...