Southeastern 2-1 Flashcards by Gregorio Mahinay III

In order to determine the true thickness of a gold vein dipping at 20°, you decide to drill a hole about 100 m away. At what inclination from the horizontal should you drill the hole?
a. 20 degrees
b. 45 degrees
c. 60 degrees
d. 70 degrees

d. 70 degrees

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The speed at which the reaction front moves forward through a cylindrical charge.
a. Detonation velocity
b. Borehole pressure velocity
c. Down-the-hole blast velocity
d. Deflagration velocity

a. Detonation velocity

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AMD results from the exposure of sulfide minerals to air and water. Aside from sulfuric acid, what is the other product?
a. Hydrochloric acid
b. Iron hydroxide
c. Iron oxide
d. Sulfur hydroxide

b. Iron hydroxide

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What is the melting point of Copper?
a. 1083 degrees Celsius
b. 1064 degrees Celsius
c. 1455 degrees Celsius
d. 962 degrees Celsius

a. 1083 degrees Celsius

b. 1064 C is the approximate melting point of Gold (Au).
c. 1455 C is the approximate melting point of Nickel (Ni).
d. 962 C is the approximate melting point of Silver (Ag).

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Which of the following is the Energy Efficiency and Conservation Act of 2019?
a. Republic Act No. 11592
b. Republic Act No. 9136
c. Republic Act No. 11285
d. Republic Act No. 847

c. Republic Act No. 11285

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What is a decline in underground mining?
a. A horizontal or nearly horizontal opening
b. A sloping opening for vehicle and ore transport
c. A horizontal or nearly horizontal opening parallel to the ore body
d. A horizontal or nearly horizontal opening used to intersect ore bodies

b. A sloping opening for vehicle and ore transport

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Carbon neutral or net zero carbon means that the amount of carbon dioxide emissions released into the atmosphere is balanced by an equal amount of carbon being removed. Which of the following is NOT a strategy in achieving carbon
neutrality?
a. Transition to electric-powered
vehicles
b. Reforestation
c. Shift to renewable energy
d. Heavy reliance on fossil fuels

d. Heavy reliance on fossil fuels

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The following are the locations of PNOC’s mines, except for:
a. Cebu
b. Malangas
c. Isabela
d. Bislig

c. Isabela

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Sublevel stoping is best applied to:
a. Low-grade, massive ore bodies
b. Weak, highly fractured rock
c. Steep, competent ore bodies
d. Gentle dipping, competent ore bodies

c. Steep, competent ore bodies

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The slope of the initial linear portion of the stress–strain curve is known as the:
a. Modulus of Rigidity
b. Shear Modulus
c. Bulk Modulus
d. Modulus of Elasticity

d. Modulus of Elasticity

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Which of the following does NOT best describe sampling in mineral prospecting and exploration?
a. Sampling is a technique for obtaining objective, reliable information about a population.
b. Sampling is done because it is usually impractical to measure the entire population.
c. The sample contains only the facts that are available on the subject slice of the population.
d. Sampling always provides complete and verified conclusions about the total population.

d. Sampling always provides complete and verified conclusions about the total population.

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A haul truck carries 150 metric tons of ore. Approximately how many long tons is this?
a. 147.6
b. 152.4
c. 165.0
d. 132.0

a. 147.6

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A stage in mineral exploration that is conducted to delineate the length, width, depth, and shape of the mineralization in a delineated Mineral Deposit(s) within a Mineral Property.
a. Phase I
b. Phase II
c. Phase III
d. Phase IV

c. Phase III

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In shrinkage stoping, which is an overhand mining method, the primary operational risk is:
a. Explosion of mine gases
b. Rock fall
c. Subsidence of the surface
d. Dilution of ore

b. Rock fall

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Which of the following best describes how a dragline operates?
a. A bucket is hydraulically lifted and tilted downward to scoop material
b. A rotating wheel with buckets continuously scrapes the ground
c. A bucket attached to a rope is pulled across the ground toward the machine
d. A cutting drum shears coal directly from the seam

c. A bucket attached to a rope is pulled across the ground toward the machine

a. hydraulic shovel/large excavator
b. Bucket Wheel Excavator (BWE)
d. shearer/ longwall shearer

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Which of the following metals is
considered most vital in the global
transition from fossil fuels to renewable energy, due to its critical role in battery production for electric vehicles and energy storage systems?
a. Copper
b. Nickel
c. Aluminum
d. Zinc

b. Nickel

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Which of the following is the preferred method for obtaining a nonweathered sample of the deposit, along with roof and floor
material that could make up seam dilution in mining operations?
a. Channel Sampling
b. Core Sampling
c. Bulk Sampling
d. Chip Sampling

b. Core Sampling

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In drilling operations, which is specifically used to recover stuck or lost core barrels, drill strings, or other equipment from the borehole?
a. Drill bit
b. Fishing tool
c. Reaming shell
d. Core lifter

b. Fishing tool

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Which of the following rock properties is the MOST important for the design of mine pillars?
a. Modulus of Elasticity
b. Shear strength
c. Compressive strength
d. Tensile strength

c. Compressive strength

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How does a Bucket Wheel Excavator operate in coal mining?
a. By scooping material with a hydraulic bucket and loading it into trucks
b. By rotating a large wheel fitted with buckets that continuously excavate material and transfer it onto conveyors
c. By cutting coal seams with a rotating drum and transporting fragments pneumatically
d. By dragging a bucket across the ground with cables to collect overburden

b. By rotating a large wheel fitted with buckets that continuously excavate material and transfer it onto conveyors

a. hydraulic excavator/hydraulic shovel.
c. continuous miner
d. dragline excavator

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Which of the following is NOT a component of greenhouse gas?
a. Carbon dioxide
b. Carbon monoxide
c. Oxides of Nitrogen
d. Water vapor

b. Carbon monoxide

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In fluid mechanics, twice the volume requires how many times the pressure?
a. Three
b. Four
c. Five
d. Six

b. Four

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A map that shows lines of equal vertical stratigraphic thickness.
a. Isopach map
b. Isochore map
c. Isochron map
d. Isobar map

b. Isochore map: This map shows lines connecting points of equal True Vertical Thickness (TVT).

a. Isopach map: This map shows lines connecting points of equal True Stratigraphic Thickness (TST).
c. Isochron map: This map shows lines connecting points of equal time.
d. Isobar map: This map shows lines connecting points of equal pressure.

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A mine timber post is designed to carry a load of 40,000 lbs. If the timber has a compressive strength of 1,200 psi, what is the required cross-sectional area in square inches?
a. 30 in²
b. 40 in²
c. 36.5 in²
d. 33.3 in²

d. 33.3 in²

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This sampling technique can easily lead to bias and inconclusive result, however be used to obtain generalized information about the material sampled. a. Channel sampling b. Grab sampling c. Cuttings sampling d. Bulk sampling

b. Grab sampling

This is a horizontal, flat-back stoping using spherical crater charges to break the ore. It is the only patented stoping method where blasting is carried out at the base of vertical holes, making horizontal cuts and advancing upward. a. Open Stoping b. Shrinkage Stoping c. Cut-and-Fill Stoping d. VCR Mining

d. VCR Mining

A mine sump receives 6,000 m³ of water daily. If the mine must be kept dry continuously and each pump runs 20 hours per day at 1,000 gallons per minute and 80% efficiency, how many pumps are needed to handle the daily inflow? Include 1 stand-by unit. Assume that there are 264 gallons per cu.m. a. 3 units b. 4 units c. 5 units d. 6 units

a. 3 units

Which of the following best describes a sill pillar? a. Portion of the deposit overlying an excavation and left in place as pillar b. Side portion of the deposit in an excavation and left in place as pillar c. Portion of the deposit underlying an excavation and left in place as pillar d. Portion of the deposit in an excavation and left in place as pillar

c. Portion of the deposit underlying an excavation and left in place as pillar

The Flue Gas Desulfurizer is a Clean Coal Technology which controls the SOx emissions and produces which of the following as a by-product? a. Lime b. Sulfuric Acid c. Gypsum d. Asbestos

c. Gypsum

In PMRC, this is a process of establishing the integrity of verified data for use in the assessment. It is essential that previous data intended to be used in the Mineral Resources and/or Mineral Reserves estimation are validated through a field check sampling program of a scale that would demonstrate that the data could be reliably used. a. Data verification b. Data collection c. Data confirmation d. Data validation

d. Data validation

Which of the following instruments is used to measure wind speed and velocity? a. Barometer b. Wind Vane c. Hygrometer d. Anemometer

d. Anemometer

In a surface mine, a shovel takes 0.4 minutes to position and 3.2 minutes to load a truck. The truck takes 9.6 minutes to haul, dump, and return. What is the minimum number of trucks required to keep the shovel busy with minimal waiting? a. 3 b. 4 c. 5 d. 6

b. 4

It is a mechanized machine designed to bore circular tunnels by cutting, grinding, and removing material while simultaneously supporting the tunnel with precast linings. a. Raise Boring Machine b. Alimak Machine c. Tunnel Boring Machine d. Idorado Machine

c. Tunnel Boring Machine

In surface mining, _____ are used on every level of the pit to create a new bench. a. Crosscuts b. Ramps c. Sidehill cuts d. Drop cuts

d. Drop cuts

The primary target year for achieving the UN SDGs is: a. 2028 b. 2030 c. 2032 d. 2035

b. 2030

These are rigid steel frames installed in weak ground or shafts. a. Steel sets b. Split steel sets c. Cable steel sets d. Forepole

a. Steel sets

This is caused by long-term inhalation and deposition of coal dust in the lungs and also called Coal Worker’s Pneumonoconiosis? a. Silicosis b. Black Lung Disease c. Asbestosis d. Brown Lung Disease

b. Black Lung Disease

The mining method is used in tabular or bedded deposits and is done in shallow deposits. a. Open pit b. Open Cast (aka. Strip Mining) c. Hydraulicking d. Quarrying

b. Open Cast (aka. Strip Mining)

Which of the following mining projects acquired the FTAA? a. Philsaga Mining Corporation b. OceanaGold Didipio Mine c. TVI Resource Development-Balabag Gold-Silver Project d. Apex Mining Co., Inc.

b. OceanaGold Didipio Mine

This is the ratio of compressive stress to the axial strain of rock. a. Young’s modulus b. Poisson’s ratio c. Shear modulus d. Bulk modulus

a. Young’s modulus

Which of the following banned the production of CFCs? a. Kyoto Protocol b. Paris Agreement c. Doha Amendment d. Montreal Protocol

d. Montreal Protocol

This mining method uses shearer and hydraulic roof support in its operation. a. Rom and Pillar b. Longwall c. Auger Mining d. Block caving

b. Longwall

All are components of mine ventilation planning, except: a. Airflow distribution b. Gas dilution and removal c. Drilling pattern d. Heat and humidity control

c. Drilling pattern

You are managing a pre-stripping contract for an open-pit nickel mine with 10 million tons of ore reserves and an overall stripping ratio of 3:1. The mine owner wants to reduce the stripping ratio to 1.5:1 during operations. If you are given 8 months with 25 working days per month, what is the average daily pre-stripping rate? a. 60,000 TPD b. 80,000 TPD c. 75,000 TPD d. 100,000 TPD

c. 75,000 TPD

A type of controlled blasting method in which parallel holes are drilled along the final excavation line and lightly charged that will eventually create a smooth fracture plane before the main blast. a. Presplitting b. Air Deck c. Cushion Blasting d. Perimeter blasting

a. Presplitting

An instrument used to measure humidity. a. Barometer b. Wind Vane c. Hygrometer d. Anemometer

c. Hygrometer

It is a cloth or canvas that is generally placed lengthwise or parallel to the entry/heading so that air is forced to move along the desired path toward the working face. a. Vent tube b. Brattice c. Stoppings d. Airlocks

b. Brattice

A type of controlled blasting method in which perimeter holes are drilled at the final excavation boundary. Its blast produces less energy, protecting surrounding rock. a. Presplitting b. Air Deck c. Cushion Blasting d. Perimeter blasting

c. Cushion Blasting

It is also called “back stoping” a. Overhand Cut-and-fill b. Drift-and-fill c. Underhand cut-and-fill d. Sill drift-and-fill

a. Overhand Cut-and-fill

A Mine Planning Engineer is evaluating the economic limit of an open pit due to increased copper prices and new ore discoveries. Determine the maximum allowable stripping ratio given the following: Value of ore = ₱30/MT Stripping cost = ₱6/MT Production cost (excluding stripping) = ₱15/MT a. 1.5 : 1 b. 2.0 : 1 c. 2.5 : 1 d. 3.0 : 1

c. 2.5 : 1

Which underground coal mine is less explosive? a. Anthracite b. Sub-bituminous c. Bituminous d. Lignite

a. Anthracite

In open-pit mine design, the final pit limit is determined using: a. Break-even stripping ratio b. Rock quality designation (RQD) c. Shaft sinking methods d. Underground stoping costs

a. Break-even stripping ratio

According to fan laws, if the fan speed is doubled, the air quantity delivered will: a. Remain the same b. Increase twice c. Increase four times d. Increase eight times

b. Increase twice

Who is the primary responsible of Underground Mine Ventilation? a. Mine Foreman b. Mine Manager c. Mine Ventilation Engineer d. Mine Ventilation Engineer

b. Mine Manager

Haul road design in open-pit mining requires consideration of: a. Gradient (slope of road) b. Road width for trucks c. Safety berms and drainage d. All of the above

d. All of the above

This underground mining method is traditionally applied in high-grade gold vein deposits, where high ore recovery and low dilution are required a. Cut and Fill b. Square Set Stoping c. Block Caving d. aRoom and Pillar

b. Square Set Stoping

The greatest challenges are the environmental impacts of coal combustion, EXCEPT: a. Air and water pollution from dust precipitates. b. Acid rain due to SOx and NOx emissions. c. Greenhouse gas emissions that contribute to global climate change, especially from CO₂. d. Ozone layer depletion primarily caused by chlorofluorocarbons.

d. Ozone layer depletion primarily caused by chlorofluorocarbons.

A mine with 2,000 miners working at 80% attendance rate on regular hours, 365 days a year, incurred a total of four (4) accidents with 23 days lost during the fiscal year just concluded. What is the company’s severity rate? a. 4.92 b. 6.56 c. 7.50 d. 8.32.

a. 4.92

All of the statements were true, but which of the following is the primary objective of mine planning? a. Maximize ore recovery b. Ensure worker safety c. Optimize ore recovery, safety, and profitability d. Minimize equipment use

c. Optimize ore recovery, safety, and profitability

The term ultimate pit slope angle refers to: a. The angle of the haul road b. The angle of the pit wall c. The angle from the crest to toe of a bench d. The production drilling angle

b. The angle of the pit wall

The following are advantages of dry stacking technology of tailings, EXCEPT: a. Elimination of large tailings dams b. Higher recovery and recycling of water c. Reduced risk of catastrophic dam failure d. Lowest capital and operating cost

d. Lowest capital and operating cost

A modern approach to tunnel construction that relies on the inherent geological strength of the surrounding rock mass to stabilize the tunnel employing sophisticated monitoring to optimize various wall reinforcement techniques. Instead of heavily supporting the ground immediately, it allows controlled deformation of the rock, using it as a load-bearing support. a. Conventional Drill and Blast Tunneling Method b. New Austrian Tunneling Method c. Tunneling Boring Machine Method d. Cut-and-Cover Tunneling Method

b. New Austrian Tunneling Method

The law that relates airflow, pressure, and resistance in mine ventilation is: a. Bernoulli’s law b. Atkinson’s law c. Boyle’s law d. Darcy’s law

b. Atkinson’s law a. Bernoulli's law relates pressure, velocity, and elevation in an ideal, incompressible fluid flow, primarily concerning energy conservation c. Boyle's law relates the pressure and volume of a gas at a constant temperature (part of the ideal gas law). d. Darcy's law describes the flow of a fluid through a porous medium (like groundwater or flow through a packed bed).

Reverse Circulation drilling refers to the circulation of air in which direction? a. Down through the drill rods and back up outside the rods b. Down outside the drill rods and back up inside the rods c. Down through the casing and back up through the annulus d. Down through the barrel and returned outside the bit

b. Down outside the drill rods and back up inside the rods

The primary cause of spontaneous combustion in coal mines is: a. Frictional heating from machinery b. Lightning strikes in open pits c. Slow oxidation of coal at low temperatures d. Residual blasting fumes igniting the coal

c. Slow oxidation of coal at low temperatures

A shovel worked for 400 hours in a month, was under repair for 50 hours, and on standby for 100 hours. What was the shovel’s physical availability? a. 72.7% b. 80.0% c. 85.0% d. 90.9%

d. 90.9%

A haul truck operated for 300 hours, was down for 60 hours, and idle for 40 hours. What is its effective utilization? a. 75.0% b. 80.0% c. 83.3% d. 85.7%

a. 75.0%

It is an underground mining method that is applied primarily to large, disseminated mineral deposits specifically porphyry copper deposits? a. Shrinkage Stoping b. Cut-and-Fill Stoping c. Block Caving d. Square Set Stoping

c. Block Caving

A booster fan is installed in an underground mine to: a. Replace the main fan b. Re-energize airflow in long or deep sections c. Measure air pressure drop d. Direct airflow at the face only

b. Re-energize airflow in long or deep sections

In the beneficiation of coal, how can pyrtic sulfur be removed? a. Hand sorting b. Jig washing c. Froth flotation d. Heavy Media Separation

c. Froth flotation

Which gas is known as the “silent killer” in mines because it is odorless and colorless? a. CO₂ b. CO c. CH₄ d. NO₂

b. CO

The Malangas mine disaster was the worst underground mine disaster in the country. What year did it happen? a. 1991 b. 1992 c. 1993 d. 1994

d. 1994

Discontinuities spaced between 200–600mm are described as: a. Close spacing b. Moderate spacing c. Wide spacing d. Very wide spacing

b. Moderate spacing

The wet bulb and dry bulb thermometer is used to measure: a. Airflow velocity b. Relative humidity c. Air pressure d. Methane concentration

b. Relative humidity

The 2nd ASEAN Mineral Awards in 2019 for the Best Practices in Metallic Mineral Processing was awarded to: a. LaFarge Holcim b. Coral Bay Nickel Corporation c. Taganito HPAL Nickel Corporation d. OceanaGold Philippines Incorporated

b. Coral Bay Nickel Corporation

Which of the following minerals is an ore of Lithium? a. Pyrochlore b. Braunite c. Spodumene d. Smaltite

c. Spodumene

These are loose fragments that have weathered away from the outcrop of the deposit. a. Floats b. Traces c. Pathfinders d. Gossan

a. Floats

Which analytical method is primarily used to determine the elemental composition of a sample? a. X-ray Diffraction (XRD) b. X-ray Fluorescence (XRF) c. Atomic Absorption Spectroscopy (AAS) d. Scanning Electron Microscopy (SEM)

b. X-ray Fluorescence (XRF)

It is a minor and slow downward movement of soil and rocks along slope with some roots and twigs of trees are still usually present. a. Creep b. Slump c. Rockslide d. Solifluction

a. Creep

Paris Agreement is a legally binding international treaty on climate change which limits the global temperature increase to? a. 0.5 degrees Celsius b. 1.5 degrees Celsius c. 2.5 degrees Celsius d. 3.5 degrees Celsius

b. 1.5 degrees Celsius

Which of the following is not a discontinuity found in metamorphic rocks? a. Foliation b. Cleavage c. Schistosity d. Bedding planes

d. Bedding planes

A block of ore weighing 45,000 MT has a tonnage factor of 2.5 MT/m³. If the swell factor is 1.25, what is the volume of the broken ore? a. 18,000 m³ b. 20,000 m³ c. 22,500 m³ d. 25,200 m³

c. 22,500 m³

The Malangas mine disaster was primarily due to: a. Methane gas explosion b. Roof collapse due to weak rock support c. Flooding from heavy rainfall entering the mine d. Tailings dam collapse

a. Methane gas explosion

This refers to the resistance of a rock to elastic deformation to produce a unit displacement under an applied force. a. Strength b. Stiffness c. Rigidity d. Toughness

b. Stiffness

Airflow is directed from point of _________ to a point of __________. a. Lower pressure, higher pressure b. Lower heat, higher heat c. Higher heat, lower heat d. Higher pressure, lower pressure

d. Higher pressure, lower pressure

It is the practice of removing the gas contained in a coal seam and adjoining strata before actual mining through wellbores drill holes, and pipelines. a. Underground gasification b. Methane drainage c. Natural gas production d. Underground retorting

b. Methane drainage

The quality of a geologic deposit cannot be accurately represented by a single value. To obtain a representative sample, multiple increments must be taken. A method of sampling where increments are spaced evenly in time or position is called: a. Systematic sampling b. Random Sampling c. Stratified random sampling d. Cluster sampling

a. Systematic sampling

Which of the following countries announced withdrawal from the Paris Agreement in 2017? a. China b. Canada c. Brazil d. United States

d. United States

A mining engineer is designing a decline at 50° from a point 120 meters away from the outcrop to reach the footwall of a coal seam dipping at 40°, with an apparent thickness of 12 meters. To the nearest meter, how long should the decline be to reach the footwall? a. 80 meters b. 90 meters c. 95 meters d. 85 meters

d. 85 meters

What technology is currently being developed and applied to minimize the heat load from underground mine equipment? a. Diesel-powered ventilation boosters b. Battery-electric vehicles (BEVs) c. Hydraulic drilling rigs with larger engines d. Compressed-air cooling systems only

b. Battery-electric vehicles (BEVs)

The Malampaya subsea pipeline carries natural gas from Palawan to Batangas. How long is the pipeline? a. 607 kilometers b. 812 kilometers c. 504 kilometers d. 388 kilometers

c. 504 kilometers

The PD 972, also known as the Coal Development Act of 1976 was amended by which of the following: a. Presidential Decree No. 1174 b. Presidential Decree No. 1471 c. Republic Act No. 7638 d. Republic Act No. 9513

a. Presidential Decree No. 1174

Which of the following minerals is NOT a source of rare earth elements? a. Bastnasite b. Monazite c. Xenotime d. Carnotite

d. Carnotite

Why is it necessary to minimize edges in an underground opening? a. Edges can increase the stress concentration in the area means allowing it to be more stable. b. Edges can decrease the stress concentration in the area means allowing it to be more stable. c. Edges can decrease the stress concentration in the area means allowing it to be less stable. d. Edges can increase the stress concentration in the area means allowing it to be less stable.

d. Edges can increase the stress concentration in the area means allowing it to be less stable.

A principle in PMRC which requires that the reader of a Public Report is provided with sufficient information, the presentation of which is clear and unambiguous, to understand the report and is not misled. a. Competence b. Transparency c. Materiality d. Integrity

b. Transparency

Which of the following is a mechanical property of rock? a. Density b. Porosity c. Compressive strength d. Mineral composition

c. Compressive strength

You are estimating block grades in an ore deposit where the global mean grade of the metal is well-established from extensive sampling campaigns. Which geostatistical estimator is most appropriate under this condition? a. Ordinary Kriging b. Simple Kriging c. Universal Kriging d. Indicator Kriging

b. Simple Kriging

Gold is a metallic mineral characterized by being soft, yellow, and highly workable. Which of the following best describes one of its key physical properties? a. Sectile b. Elastic c. Malleable d. Ductile

c. Malleable

According to coal mine safety rules, what is the allowable limit of hydrogen sulfide in active workings? a. 0.0005% b. 0.01% c. 0.10% d. 0.5%

c. 0.10%

Which failure mode occurs when rock slides along pre-existing discontinuities? a. Tensile failure b. Shear failure c. Planar failure d. Buckling failure

c. Planar failure a. Tensile failure: Occurs when the rock is pulled apart by forces perpendicular to a plane, resulting in cracks or fractures. b. Shear failure: This is the fundamental mechanical process where a material fails due to forces acting parallel to a surface, causing one part of the material to slide past the other. d. Buckling failure: Occurs in slopes with steeply dipping, thin, and closely spaced discontinuities parallel to the slope face.

Southeastern 2-1 Flashcards

(100 cards)