Midterm Exam Reviewer Flashcards
Who wrote one of the first printed books in mining entitled ‘De Re Metallica’?
Georgius Agricola
_________ is a British mining agent who presented the famous paper “On the Theory of the Ventilation of
Mines” in 1854.
John Atkinson
Canaries are known to detect what mine gas?
Carbon Monoxide
__________ denote average concentrations of gases to which workers are permitted to be exposed over an 8-hour
daily period.
Time-Weighted Average
The Threshold Limit Value of a gas is expressed in __________ of surrounding air.
Parts per Million
__________ is produced by the incomplete combustion of carbon materials during fires and explosions. It may
also be liberated when water or steam comes in contact with hot carbon materials during firefighting.
Hydrogen
Gas
_____________ is produced when sulfur compounds decompose. It is found in certain oil and gas fields and in some gypsum mines. It also may be liberated from methane feeders in mines with methane. It is often liberated when acid
mine water corrodes metallic sulfides. It can also be released from mine water which contains the gas in solution.
Hydrogen Sulfide
Elevated _________ readings may indicate that a fire or explosion has taken place somewhere in the mine. High readings may also indicate an oxygen deficient atmosphere.
Carbon Dioxide
_________________ is a product of the incomplete combustion of any carbon material. It is produced by mine fires and explosions of gas. Carbon monoxide is produced by the burning or detonation of explosives, and it is emitted
from the exhaust of internal combustion engines.
Carbon Monoxide
The quantity of fresh air, including compressed air, supplied underground in any ventilated district, area or system, at any time at which the number of employees employed is at its maximum shall not be less than ________________during the full period of work exclusive of the quantity requirement of equipment.
2.0 cu. m./min./man
True or False. Where toxic gases of any nature, whose concentration will endanger the workers, are found in mine workings, the Director or his duly authorized representative shall be immediately notified by the quickest means of
communications. Further, the allowable limit of gases in a mine shall be provided to the companies.
True
True or False. In all portions of a mine or working where the natural ventilating current is insufficient, suitable mechanical equipment for ventilation shall be operated or provided. Mechanically produced and positively controlled air
current shall be provided for each mine with more than three hundred (300) meters in depth (measured along the line of
the drifts) unless it can be proven that mechanically produced air current would not be necessary.
False - shafts instead of drifts
True or False. Every door directly assisting or in any way affecting the ventilation of a mine shall be so adjusted as to be self-closing and shall remain open in the event the ventilating current is reversed in an emergency.
False - remain closed
True or False. Active underground areas that cannot be supplied thru natural/mechanical ventilation shall be provided with compressed air. Airline shall be provided with two (2) air valves at the entrance and at the end of the pipe. The valve at the end pipe shall be closed at all times.
False - shall be open at all times
True or False. The main intake and main return air currents in mines shall be in separate shafts, stopes, or drifts except in a single shaft properly designed to accommodate both intake and downcast.
False - exhaust instead of downcast
True or False. Sufficient air shall be provided to dilute or remove blasting fumes with as much delay as possible.
False - as little delay as possible
True or False. Changes in ventilation that may adversely affect the safety of the employees shall be made only when the mine is idle and all employees are in the mine except those engage in changing the ventilation.
False - no employees
True or False. Bulkhead or stoppings in areas intended to be reopened shall be provided with pipes and valves for sampling purposes.
True
True or False. Dry drilling shall be prohibited. Permission shall be secured from the director for isolated cases or from the Bureau for large scale dry drilling.
False - the manager
True or False. Working places that emits dust shall be kept dry from time to time during the duration of work. Sufficiently wetted
False - be sufficiently wetted
What are the duties of Mine Ventilation Engineer?
- regular inspection and testing workplaces, travel ways and locations where persons may travel
- At three (3) months interval and after any substantial change to the primary ventilation circuits and volume flows, determining and recording the quantity and quality of ventilating air in the mine using
correct procedures and using instruments and equipment suited to that purpose. - Operating, calibrating and maintaining any metering or monitoring device used to determine the level of emission of toxic or other atmospheric contaminants from any plant or equipment at the mine.
- Ensuring that all atmospheric contaminants sampling is carried out and is recorded and reported accurately.
- Correctly selecting and positioning auxiliary fans if required to ensure that the required volumes of air are provided in workplaces at the mine to meet the requirement.
- Reading and recording the wet and dry bulb temperatures of all workplaces in the mine where it is suspected that temperatures or humid conditions may have potential for adverse effects on the health and safety of persons in the workplaces.
- Having the pressure and volume readings of primary forms used in ventilating the mine taken and recorded at intervals not excluding 3 months.
- Having ventilation plans of the mine should be updated at all times and to ensure that the current ventilation and survey information is immediately available on special plans maintained for the use of
rescue teams in the event of an underground emergency.
Minimum Requirements for the qualification as Underground Ventilation Engineer
- a licensed engineer in which mine ventilation was a substantial component of the curriculum; and
- a minimum of three (3) year experience in mine ventilation.
Draw the profile of the following gases based on their specific gravities. Air, Oxygen, Nitrogen, Carbon Dioxide, Carbon Monoxide, Nitrogen Dioxide, Hydrogen, Hydrogen Sulfide, Sulfur
Dioxide, Methane
- Hydrogen
- Methane
- Carbon Monoxide
- Nitrogen
- Air
- Oxygen
- Hydrogen Sulfide
- Carbon Dioxide
- Nitrogen Dioxide
- Sulfur Dioxide
A Mining Engineer and his team, upon inspection on the mine working area discovered that the concentration of toxic gases present in the area exceeds that allowable limit for such gases provided by the bureau. What should he immediately do?
Where toxic gases of any nature, whose concentration will endanger the workers, are found in mine workings, the Director or his duly authorized representative shall be immediately notified by the quickest means of communications. Further, the allowable limit of gases in a mine shall be provided to the companies
