BU 1 Flashcards by Gregorio Mahinay III

The strength of a fractured rock mass
A. unlimited
B. purely frictional
C. zero
D. nil

C. zero

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Among the minerals associated with chromite, this one is used as indicator of its
mineralization.
A. Chromium
B. Iron
C. Olivine
D. Plagioclase

B. Iron

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According to the fan laws, thrice the volume develops how many times the pressure?
A. 7 times the pressure
B. 9 times the pressure
C. 5 times the pressure
D. 4 times the pressure

B. 9 times the pressure

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Which underground mining method would be most effective for a horizontally extensive
but shallow ore body?
A. Sublevel stoping
B. Room and pillar
C. VCR
D. Longwall mining

B. Room and pillar

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The concept of replacing the intermittent operations of rock breakage and materials
handling in mining with a system of continuous extraction.
A. Novel Mining
B. Rapid Excavation
C. Longwall Mining
D. TBM

B. Rapid Excavation

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Nickel laterite deposits usually come along with this by-product.
A. Copper
B. Iron
C. Manganese
D. Cobalt

D. Cobalt

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Instrument used to measure medium velocity air flow in mines.
A. Vane Anemometer
B. Canary Bird
C. Smoke-Cloud Generator
D. Pitot Tube

A. Vane Anemometer

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A sedimentary rock weighs 145 lb per cu ft in its dry form. What is its specific gravity?
A. 2.3
B. 2.5
C. 2.6
D. 3.0

A. 2.3

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A hardwood timber is used as post to support an average load of 25,000 pounds, 5 feet
high. If the timber has a compressive stress of 800 psi, what would be the typical size of
timber support most economical to be used for the purpose?
A. 4 x 6 inches
B. 6 x 6 inches
C. 12 x 14 inches
D. 8 x 6 inches

B. 6 x 6 inches

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A new method of hoisting that is designed for every deep shaft extending more than
6,000 ft. in depth.
A. Drum
B. Friction-sheave
C. Multi-drum
D. Koepe

C. Multi-drum

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A mineral that has either blue or green outcrop, and exists as carbonates, silicates,
sulphates, oxides and in native form is
A. Nickel
B. Iron sulphides
C. Mercury
D. Copper

D. Copper

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No stoping shall be undertaken within meters radius from the main shaft.
A. 16
B. 20
C. 18
D. 22

A. 16

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Philex Mining Corporation ordered new set of conveyor belts to replace its cable belt
at its Padcal Copper Mine. The conveyor belt that arrived in the mine are logged as
follows: Quantity, 5 spools; Spool Dimension: Core diameter, 18 inches; Outside
diameter, 5 feet; Conveyor Width, 36 inches; Conveyor thickness, 1 cm. What is the total
length of the conveyor belts? Express the length in the nearest rounded meter.
A. 839 m
B. 1,029 m
C. 729 m
D. 629 m

A. 839 m

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A classification of a rock mass that quantifies discontinuities defined as the ratio of the
lengths of the individual pieces of core in a drill run, having lengths of 10 cm or greater,
and the total length of drill run.
A. RMR
B. Q-System
C. RQD
D. Load factor

C. RQD

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Investigation reports discussing the severity of an accident in case of fatal or serious
accident shall be made:
A. Within 7 calendar days from the date of accident
B. Within 15 calendar days from the date of accident
C. Within 21 calendar days from the date of accident
D. Within 30 calendar days from the date of accident

B. Within 15 calendar days from the date of accident

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Under the “People’s Small Scale Mining Act of 1991”, the extent of a small scale mining
area that may be awarded to the qualified applicant shall not exceed
A. 5 has.
B. 10 has.
C. 15 has.
D. 20 has.

D. 20 has.

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The quality of coal is measured by which of the following parameters?
A. Color
B. Moisture content
C. BTU value
D. Density

C. BTU value

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An existing 200 meter deep vertical cylindrical shaft with a diameter of 22 meters needs
to be lined with one meter thick concrete. What is the approximate volume of concrete
needed (final answer rounded to the nearest hundreds)?
A. 13,200 cu.m.
B. 14,100 cu.m.
C. 6,500 cu.m.
D. 5,600 cu.m.

A. 13,200 cu.m.

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Which of the following is an example of a microorganism used in bioleaching?
A. Cyanobacteria
B. Thiobacillus ferrooxidans
C. Escherichia coli
D. Saccharomyces cerevisiae

B. Thiobacillus ferrooxidans

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Threshold limit value for carbon dioxide in an 8 hr exposure.
A. 5%
B. 0.5%
C. 0.05%
D. 0.005%

B. 0.5%

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In mine ventilation, the most commonly monitored or measured aspect of mine air in
the underground is:
A. air velocity
B. air humidity
C. air temperature
D. air pressure

A. air velocity

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Test commonly used to determine the uniaxial compressive strength (UCS) of a rock
sample.
A. Direct shear test
B. Brazilian test
C. Triaxial test
D. Point load test

D. Point load test

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What is the importance of defining the pit limit?
A. To determine the amount of minable ore
B. To determine the number of equipment to use in the extraction of ore
C. To determine the cut-off grade of minerals of value
D. To determine the life of mine

A. To determine the amount of minable ore

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Which of the following is the product of smelting metallurgical chromite?
A. Dichromates
B. Ferrosilicon
C. Ferrochrome
D. Ferrromanganese

C. Ferrochrome

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Type of equipment is primarily used for the excavation of large quantities of overburden in surface mining? A. Bulldozer B. Dragline C. Excavator D. Haul truck

B. Dragline

One form of the mineral agreement between the Government and Contractor wherein the Government shall provide inputs to the mining operations other than the mineral resources. A. Joint Venture B. MPSA C. Co-Production D. Mining Lease Contract

C. Co-Production

How does the maintenance of switchbacks compare to spiral ramps over the life of a mine, and what factors contribute to the differences? A. Spiral ramps require less maintenance due to gradual curves; factors include lower wear on vehicles and reduced erosion. B. Switchbacks require more maintenance due to sharp turns; factors include increased tire wear and frequent road resurfacing. C. Spiral ramps demand higher maintenance due to longer travel distances; factors include better load distribution. D. Erosion control and drainage management.

B. Switchbacks require more maintenance due to sharp turns; factors include increased tire wear and frequent road resurfacing.

A horizontal opening driven from a shaft and (or near) right angles to the strike of a vein or other orebody. A. Level B. Drift C. Crosscut D. Ramp

A. Level

The spraying of mine roadways with concrete to give a measure of support presents a smooth surface to the air current and prevent weathering. A. Shotcreting B. Guniting C. Grouting D. Cementing

B. Guniting C. Grouting: Fills internal voids and cracks to strengthen rock and control water. A. Shotcreting: Sprays a surface layer for ground support and structural stability. B. Guniting: A dry-mix method of shotcreting, useful for specific repairs and remote locations.

Mulok is a local name that refers to what? A. Ore B. Tailings C. Waste D. Chalcopyrite

C. Waste

A line drawn on a map connecting all points of equal elevations. A. Topography B. Contour C. Strike D. Dip

B. Contour

Any disintegrated rock found at the toe of slope that contains mineral present for further investigation. A. Float B. Gossan C. Ore D. Bonanza

A. Float

What do you call the mercury that is laden with gold? A. Mercury vapor B. Mercury condensate C. Sick mercury D. High grade mercury

C. Sick mercury

A mine rescue team shall maintain a minimum of ______ fully trained men. A. 10 B. 5 C. 12 D. 7

C. 12

How many times of power required in order developing twice the volume? A. 7 times the power B. 6 times the power C. 5 times the power D. 8 times the power

D. 8 times the power

The faster the air moves, the lower its pressure. A. Kirchhoff’s law B. Ohm’s law C. Ventilation D. Bernoulli’s Principle

D. Bernoulli’s Principle

Storage of flammable liquids or materials within ______ meter radius of any main entrance to the underground mine is prohibited. A. 20 B. 30 C. 50 D. 70

C. 50

The distance separating the adjacent rock walls of an open discontinuity in which the intervening space is filled with air or water. A. Filling B. Spacing C. Strike D. Aperture

D. Aperture A. Filling: The material that exists within the space between the rock walls of a discontinuity. B. Spacing: The perpendicular distance between adjacent, parallel discontinuities belonging to the same set. C. Strike: The compass direction (azimuth) of a horizontal line contained within the plane of the discontinuity. It is one of the two parameters (with Dip) used to define the spatial orientation of the plane. D. Aperture: The perpendicular distance separating the adjacent rock walls of an open discontinuity, often measured in millimeters or micrometer

It is a vertical opening in a mine where air flows from the underground to the surface due to change in pressure and temperature. A. Intake B. Upcast C. Exhaust D. Downcast

C. Exhaust A. Intake: The general term for any airway carrying fresh air into the working areas of the mine. It supplies the necessary oxygen and dilutes contaminants. B. Upcast: A main vertical or inclined shaft (or a section of a shaft) specifically designated to conduct the entire volume of contaminated air from the mine up to the surface for discharge. C. Exhaust: The general term for any airway carrying contaminated air away from the working areas and out of the mine. D. Downcast: A main vertical or inclined shaft (or a section of a shaft) specifically designated to bring the entire volume of fresh air from

Allowable distance from the shaft collar while waiting to board the cage. A. 2 m B. 3 m C. 4 m D. 5 m

B. 3 m

What do coal or explosives component that is used to provide oxygen in detonation? A. Sensitizer B. Fuel component C. Blasting agent D. Oxidizer

D. Oxidizer

The ore feed to an ore dressing plant assayed 18 g/t. How much lead (in DMT) is in the concentrate if the feed is 1,000 DMT and the recovery is 90%? A. 440.3 DMT B. 40.3 DMT C. 304.3 DMT D. 140.3 DMT

D. 140.3 DMT

What is the swell factor for a material that has a bank volume of 100 m³ and an excavated volume of 130 m³? A. 30% B. 130% C. 13% D. 3%

A. 30%

All employees shall receive no less than ______ hours of refresher training no less frequency than once each year. A. 40 B. 15 C. 24 D. 8

D. 8

Which factor most likely to influence the decision to expand an open-pit mine horizontally rather than vertically? A. The price of the mineral being extracted B. The depth of the water table C. The cost of transporting the ore D. The slope angle of the pit walls

D. The slope angle of the pit walls

It is a horizontal excavation to expose a mineral outcrop. A. Shaft B. Test pit C. Adit D. Trench

D. Trench

How many short tons are there in a long ton? A. 1.12 B. 0.89 C. 0.91 D. 1.10

A. 1.12

Any building or structure other than explosive manufacturing building used for the storage of explosives and blasting accessories. A. Storage Area B. Magazine C. Mobile Manufacturing Equipment D. Housing

B. Magazine

Mining method that is exclusively by retreating method with the cut-off grade serving only to define the fringes of major ore zones. A. Cut-and-Fill B. Open Cast C. Block Caving D. Open Pit

C. Block Caving

Type of equipment used for leveling the surface of a mine site? A. Loader B. Grader C. Scraper D. Dozer

B. Grader A. Loader: Loading loose material (ore, coal, aggregate) into haul trucks or moving it short distances for stockpiling (Wheel Loader/Front-End Loader) B. Grader: Fine grading and maintenance of haul roads and work surfaces (Motor Grader). C. Scraper: Excavation, hauling, and dumping of loose material (e.g., soft soil, topsoil) over medium to long distances. D. Dozer: Pushing and short-distance moving of material (e.g., overburden, coal) and site preparation (Bulldozer).

Which of the following materials is likely to have the highest swell factor? A. Sand B. Gravel C. Clay D. Solid rock

C. Clay

In a mine with 2,500 employees where 120 were on sick leave and another 130 were on vacation leave for a particular month, there were 18 lost time accidents. Assuming the employees worked for 25 days (for 8 hrs) and no one worked overtime, what was the Accident Frequency Rate per million manhours? A. 40 B. 50 C. 80 D. 100

C. 80

A truck working in an open pit mine for 620 hours during a month was under repair for 70 hours and on standby for 160 hours. What is the physical availability of the truck? A. 67% B. 73% C. 81% D. 92%

D. 92%

The potential or stored energy of the air. A. Static Pressure B. Dynamic Pressure C. Total Pressure D. Bursting Pressure

A. Static Pressure

One of these minerals is exhibiting a combination of pink, violet, and black outcrop. A. Zinc B. Lead C. Manganese D. Cobalt

D. Cobalt

This is done by laying two pieces of round or square timbers on top of two similar pieces of timber but at right angles to them. A. Muck piling B. Cribbing C. Wedging D. Square set

B. Cribbing

The airborne suspension of solid particles from the products of detonation and deflagration. A. Dust B. Smoke C. Fumes D. Gases

C. Fumes

Those underground and surface mine/service contractors employing a total of not less than twenty-five (25) employees and not more than fifty (50) employees, respectively, to not more than fifty (50) and seventy-five (75) employees, respectively. A. Class A B. Class C C. Class D D. Class B

B. Class C

The explosive reaction that happens with the use of gunpowder. A. Detonation B. Deflagration C. Decoupling D. Firing

B. Deflagration

Any disintegrated rock found at the toe of slope that does not contain mineral present for further investigation. A. Protore B. Talus C. Ore D. Bonanza

B. Talus

In an open pit mine ramp system with an 10% ramp grade, how many meters must a truck travel to cover a vertical distance of 650 meters? A. 7500 m B. 6500 m C. 65 m D. 715 m

B. 6500 m

A staggered blast pattern was employed in blasting a 3-acre land. It was noted that drilling commenced at 1200 m elevation and aims at 1192 m elevation. A subdrill was also noted to be 0.5 m. Compute for the total volume to be blasted. A. 80,468.6 cu.m. B. 56,656.04 cu.m. C. 44,515.46 cu.m. D. 97,124.64 cu.m

A. 80,468.6 cu.m.

A staggered blast pattern was employed in blasting a 3-acre land. It was noted that drilling commenced at 1200 m elevation and aims at 1192 m elevation. A subdrill was also noted to be 0.5 m. Compute for the total volume to be blasted. A. 80,468.6 cu.m. In previous problem, compute for the powder factor given 18,000 kg of ANFO. A. 0.19 kg/cu.m. B. 0.17 kg/cu.m. C. 0.22 kg/cu.m. D. 0.26 kg/cu.m.

A. 0.19 kg/cu.m.

This gas supports all life forms and a decrease of its availability in air composition can be lethal. A. Nitrogen B. Oxygen C. Hydrogen D. Helium

B. Oxygen

In the layering of gases after an underground explosion, which of these gases lies at the bottom? A. Carbon Monoxide B. Carbon Dioxide C. Methane D. Hydrogen Sulfide

B. Carbon Dioxide

Nava is a local term that refers to what kind of material? A. Tailings B. Ore C. Gob D. Waste

B. Ore (Vein)

In a mine with 2,500 employees where 120 were on sick leave and another 130 were on vacation leave for a particular month, there were 18 lost time accidents. Assuming the employees worked for 25 days (for 8 hrs) and no one worked overtime, what was the accident frequency rate per million manhours? A. 40 B. 50 C. 80 D. 100

A. 40

All Temporary Safety Engineers must undergo ______ hours of occupational safety and health training/seminars sponsored by the Bureau and/or recognized institution. A. 24 B. 40 C. 8 D. 32

B. 40

If a certain rock type has a swell factor of 45%, what would be the approximate excavated volume for 1,000 m³ of bank volume? A. 500 m³ B. 1,500 m³ C. 2,000 m³ D. 1,4500 m³

D. 1,4500 m³

According to the fan laws, thrice the volume develops how many times the pressure? A. 7 times the pressure B. 9 times the pressure C. 5 times the pressure D. 4 times the pressure

B. 9 times the pressure

Which of the following is composed of ammonium nitrate, water and explosive or non explosive sensitizers? It is formulated purposely to extend the range of properties and characteristics of blasting agents. A. Emulsion B. Dynamite stick C. Slurry D. Semi-gelatin

C. Slurry A. Emulsion: Water-in-oil emulsion of Ammonium Nitrate (AN) solution and a fuel phase (typically oil/wax), sensitized with gas bubbles or microspheres. B. Dynamite stick: Nitroglycerin (NG) absorbed in a solid, porous material (dope) like wood pulp or diatomaceous earth. C. Slurry: Aqueous mixture of oxidizer salts (e.g., AN) in a thickener (gel) with a sensitizer/fuel. Contains significant water. D. Semi-gelatin: A type of dynamite with a lower NG content than Gelatin dynamite, but more than Ammonia dynamite. It's a blend of gelatin and AN ingredients.

A mine rescue team shall maintain a minimum of ______ fully trained men. A. 10 B. 5 C. 12 D. 7

C. 12

Advancing in an upward direction A. Inby B. Underhand C. Outby D. Overhand

D. Overhand

Class B mines shall have at least which of the following? A. Part-time safety engineer and full-time safety inspector B. Full-time safety director only C. Full-time safety inspector and a deputy inspector D. Full-time safety engineer and full-time safety inspector

D. Full-time safety engineer and full-time safety inspector

Which of the following does not belong to the group? A. Millerite B. Magnesite C. Pentlandite D. Garnierite

B. Magnesite

Bedrock of chromite deposits A. Ophiolite B. Sheeted dikes C. Peridotite D. Olivine

C. Peridotite

The VOD of ANFO is most influenced by: A. Temperature B. Blast pattern C. Prill size D. Charge diameter

A. Temperature

The type of copper deposits of Lepanto Consolidated Mining Company located at Mankayan, Benguet. A. Vein-type B. Disseminated C. Porphyry D. Massive

C. Porphyry

The type of gold deposits of Masbate Gold Project located at Aroroy, Masbate A. Vein-type B. Disseminated C. Porphyry D. Epithermal

D. Epithermal

A method of exploration that is used to locate disseminated mineralization. A. Induced Polarization B. Geostatistics C. Geophysical Exploration D. Kriging

A. Induced Polarization

The condition of the surrounding rock in In-situ mining? A. Consolidated B. Unconsolidated C. Permeable D. Impervious

D. Impervious

A road arrangement to surmount the grade of a steep climb in an open pit mine. A. Switchback B. Ramp C. Drive D. Haul Roads

A. Switchback

Instrument used to measure high-velocity air flow in mines. A. Vane Anemometer B. Canary Bird C. Smoke-Cloud Generator D. Pitot Tube

D. Pitot Tube

Underground mining method most suitable for extracting steeply dipping ore body? A. Cut and Fill B. Block Caving C. Resuing D. VCR

A. Cut and Fill

Percentage of oxygen in underground mines required under the “Revised Mines Safety Rules and Regulations” is: A. 18% by volume B. 20% by volume C. 19% by volume D. 21% by volume

D. 21% by volume

n ingredient used in explosive compounds to promote greater ease in initiation or propagation of the detonation reaction. A. Oxidizer B. Emulsifier C. Reagent D. Sensitizer

D. Sensitizer

An igneous rock weighs 170 lb per cu ft in its dry form. What is its specific gravity? A. 2.3 B. 2.5 C. 2.7 D. 3.0

A. 2.3

An explosive produces toxic fumes due to this condition. A. Fuel shortage B. Excess fuel C. Excess explosive charge D. Excess oxygen

B. Excess fuel

The costliest equipment part of hauling trucks. A. Engine B. Tires C. Bucket D. Axle

B. Tires

What do you call that new mining method where slushers, chutes, and tramways have been eliminated and replaced by more economic and high-capacity diesel-operated machines? A. Belt conveyor mining B. ADT materials handling C. Trackless LHD mining D. Trackless HD mining

C. Trackless LHD mining

A truck working in an open pit mine for 620 hours during a month was under repair for 70 hours and on standby for 160 hours. What is the percent utilization of the truck? A. 67% B. 73% C. 81% D. 92%

B. 73%

It is a mechanical and systematic process of combining various materials to produce a uniform mass. A. Controlled blasting B. Sampling C. Blending D. Salting

C. Blending

How many long tons are there in a short ton? A. 1.12 B. 0.89 C. 0.91 D. 1.10

B. 0.89

The Philippines is one of the largest producers of which mineral, critical for stainless steel production? A. Iron B. Bauxite C. Nickel D. Zinc

C. Nickel

The short-term supply of geologic materials. A. Reserve B. Anomaly C. Resource D. Proved Reserve

D. Proved Reserve

It pertains to the surface unevenness and waviness of the discontinuity relative to its mean plane. A. Persistence B. Aperture C. Roughness D. Spacing

C. Roughness

An existing 200-meter-deep vertical cylindrical shaft with a diameter of 22 meters needs to be lined with one-meter-thick concrete. What is the approximate volume of concrete needed? A. 13,200 cu.m B. 14,100 cu.m C. 6,500 cu.m D. 5,600 cu.m

A. 13,200 cu.m

The days lost per million manhours worked. A. Severity Rate B. Frequency Rate C. Lost-time Accidents D. Accident

A. Severity Rate

The strength of a fractured rock mass. A. Unlimited B. Purely frictional C. Zero D. Nil

C. Zero

A large porphyry copper deposit has been explored by drilling a grid pattern with 80 drill holes at 100 meters depth of mineralized zone averaging 0.8% Cu, 10 drill holes of 90 meters averaging 0.68% Cu, and 40 drill holes of 70 meters averaging 0.60% Cu. What is the average grade of the deposit? A. 1.00% B. 0.60% C. 1.50% D. 0.08%

A. 1.00%

BU 1 Flashcards

(100 cards)