The method of mining for surface Highwall or out recovery of coal by boring or excavation openings

The amount of oxygen in underground mines required under the revised mind safety rules and regulation is

In planning and development, what is the main factor for determining the bench height and an open pit?

Occurs when an obstruction to the flow is encountered, and the velocity of the medium is great enough

What is the importance of defining the pit limit?

It is the underground mind gas otherwise called as white dump

Refers to the timbering or concrete around the mass or top of the shaft

cut and fill stoping, shrinkage stoping VCR stoping And long wall mining our methods that are

How many drivers are required for mining company that operates 10 dump trucks running 24 hours a day in a shift of two shift schedule considering 85% mechanical availability and 10% manpower availability

The condition of the surrounding rock in in situ Mining

Underground mining method used to extract mineral deposits that are roughly tabular, strong flat or simply dipping and generally in contact with strong wall rock

A type of anemometer suitable for measuring very high velocities than special anemometer

All unit operations involve in extracting or excavating or moving bulk materials or minerals during mining

Mine gas produce as a result of poor blasting

An overhand mining in which the ore is mine in horizontal slices and remains in the slope as a temporary support for the walls and to provide a working platform

The concept of replacing the intermittent operations of rock, breakage, and material handling in mining with system of continuous extraction

The underwater excavation deposit usually carry out the floating vessel, which may and corporate processing and was posting facilities

Open excavation from which ore is removed from by gravity through a race or connecting to underground, haulageways

The mixture of gases which remains in a mind after a mind, fire or an explosion of fire, dump or cool dust

During the first shift for 24 hour operation with a two shifting schedule a deal machine was in operation for 10.5 hours and under what you prepared for 3.5 hours within this timeframe, the drill machine achieve the production of 251 m calculate the percentage utilization of the drill machine during the first shift

The practice of removing the gas contained in the coal seam and adjoining strata through wellbores, drill holes, and pipeline

the process wherein large quantities of hot water are introduced to wells drilled into buried deposit of native sulfur

A method of caving that utilizes the weight of an ore column that is being given to crash itself into sizes, small enough to pass through drop points that have been prepared beforehand

It is a vertical or horizontal opening to the surface where air enters and circulate inside the mine with the aid of different fans

In borehole extraction or aqueous extraction rock should be

produces pressure by importing a Tangential acceleration to air as it proceeds to the impeller

A surface mining method where the overburden is stripped first and dumped at the same time then the body is mine horizontally in a single bench

It is timbered stope but classified as a self-supporting opening because the timbers are not used as support, but to provide working platforms for miners the method is applicable to very narrow veins so that the timber to be used or normally 5 to 6 feet

It is called the back ‘pressure results’ from the inside of the vent tube or drift not being perfectly smooth. The air cannot move along the tube or drift as fast as the fan would like to blow more air into the airway does producing friction.

It is a type of ventilation which is efficient and generally dependable

The most expensive among the placer mining methods

A term applied the carbon monoxide or atmosphere containing lethal quantities of carbon monoxide

The threshold limits value of hydrogen sulfide as per Revised mine, safety rules, and regulation

An effective way to operate a mine with conventional haulage methods in an inclined seam or bed is to drive all openings cross pitch that is

It is the underground mine gas otherwise called a marsh gas

A surface or near surface deposit usually tabular, and maybe of considered durable aerial extend containing a mineral particles in detritus

It is the underground mine gas otherwise called choke or black damp

The total area around an airway is called

Underground mining method used by small scale miners

The unexcavated face of exposed over burden and coal or an ore In an open cast mining or the face or bank on the uphill side of a contour strip mine excavation

According to the fan law twice the volume develops, how many times the pressure

Methane is explosive with this range of concentration

The oldest method of my name, both coal And most metallic ores

Basically, a continuous large volume digging machine attached to gravity concentrating facility with waste removal systems contained on floating platform

Prolonged exposure of miners to coal dust causes

During the First shift of 24 hour operation with a two shifting schedule a drill machine was an operation for 10.5 hours and underwent repairs for 0.5 hours within this timeframe, the drill machine achieved a production of 251 m calculate the percentage utilization of the drill machine during the first chef

In the layering of gases after an underground explosion, which of these gases slice on top

it is the underground mine gas otherwise called as “ laughing gas”

Hydrogen gas is exclusive with this range of concentration

The most predominant method of mining worldwide

In a mind with 2000 employees where 100 were on sickleave and another were on vacation leave for a particular month. There were 18 last time accident assuming the employees worked for 25 days and no one worked overtime. What was the accident Frequency per million hours

The Costliest method in underground mining

Any source of potential damage harm or adverse Health effects on something or someone

Used to measure moderate velocity airflow

The losses and energy due to the roughness of the wall

Sublevel block caving is a hybrid between sublevel caving and block caving introduced to counter

A system of Transporting ore Consisting essentially of head frame head, winding machine, and winding ropes

In class be mine, the safety engineer required should be

The threshold limits Value of carbon dioxide as per revised mines safety rules, and regulation

Pressure exerted By the air on the walls of the containing vessel

The unsupported and underground mining methods can be used in any type except in

tailings and slurries Maybe ask backfill in a subsidence area

A product of mine explosion and is given off by gasoline motors during the donation of negating, oxygen balance explosives

The percentage of Time the equipment is available to perform its intended function over a defined period of time when it is required by operation

Investigation reports discussing this severity of an accident in case of fatal or serious accident shall be made

Mine gas that supports combustion

An excavator loads dump trucks in a mining operation. The excavator has a cycle time of two minutes each dump trucks have a capacity of 80 tons and requires eight buckets to fill determine the number of dump trucks that can be loaded per hour, assuming an 80% utilization rate.

The ideal number of members of a miner rescue team should be

In the context of mine production optimization, which of the following factors can contribute to increase operational, efficiency, and productivity

Validity of all safety, engineer, or safety inspector permits

At what temperature are Celsius and Fahrenheit equal

The faster, the air moves the lower pressure

Sublevel keeping method requires to be called so due to the fact that

A large scale or bulk mining method that is highly productive low in cost and use primarily on massive deposits that must be underground

The temporary saves, the inspector should renew its temporary license every

Sublevel caving layout depends primarily on the size and shape of the ore body for steeply dipping and narrow ore bodies, the appropriate layout is

It is any division or branch of ventilation circuit

Lung ailment caused by for belonged exposure to tin dust

During the first shift of a 24 hour operation with a two shifting schedule a drill machine was an operation for 10.5 hours and under one repairs for 0.5 hours within this timeframe, digital machine achieved a production of 251 m calculate the penetration rate of the drill machine

The class A mine underground has at least of number ____ Workers