MINE PLANNING AND DESIGN

d. adit

 What type opening is most suitable considering the following conditions: a deposit outcrops in an area of high relief and shallow cover; it dips steeply and can be intersected at relatively shallow depth.

a. decline c. vertical shaft

b. slope d. adit

d. multi-drum

A new method of hoisting that is design for every deep shaft extending more than 6,000 ft. in

depth.

a. drum c. koepe

b. friction-sheave d. multi-drum

d. out by

 ________ in the direction of the mine entrance.

a. entry c. in by

b. portal d. out by

b. split

 It is any division or branch of the ventilation circuit:

a. air split c. airway

b. split d. air course 

c. rubbing surface

The total area around an airway is called

a. regulator c. rubbing surface

b. surface aread. resistance surface

a. beam building

In coal mining, this is the creation of a strong, inflexible beam by bolting or otherwise fastening together several weaker layers:

a. beam building c. bolting

b. barrier pillars d. grouting

b. barrier pillars

Solids blocks of coal or rock left between two miners or sections of a mine to prevent accidents due to inrushes of water or gas, or to protect pillars in headings against crushing:

a. beam buildings c. gob

b. barrier pillars d. fillings

c. bleeder entries

These are special air courses developed and maintained as part of the mine ventilation system that are design to continuously move air-methane mixtures emitted by the gob away from active workings and into mine-return-air courses:

a. airways c. bleeder entries

b. air courses d. overcasts

d. NaNO₃

 Fuels and oxidizers are the principal reacting ingredients in explosives. Which do you think is not a fuel?

a. TNT c. carbon

b. aluminum d. NaNO₃

c. permissible

These are specially formulated mixtures that are safe to use in flammable atmospheres in underground coal mines:

a. ANFO c. permissible

b. NG explosives d. black powder

d. 1-3/2⁰

Rope fleet angle is the angle subtended by the hoist rope and the centerline from the drum to reduce rope abrasion in the sheave groove, the fleet angle should be restricted to:

a. 2-5/2⁰ c. 1-2⁰

b. 3⁰ d. 1-3/2⁰

c. locked-coil

 A wire rope that is suitable for any system (drum hoist or friction-sheave) at depths of over 3,200 ft is

a. flattened strand c. locked-coil

b. round strand d. all of the above

c.  12.10MT/m

If you are a draw control engineer in a block caving operation and you are required to have at least a subsidence of 1 meter of the caved ore from each draw raise, compute for the amount of draw you should get from each finger raise (each with a diameter of 3 meters) considering that the insitu density of the ore is 2 MT/cu. m. with a swell factor of 17 % upon caving.

a. 14.10MT/m c.  12.10MT/m

b. 19.47MT/m d. 15.22MT/m.

c. vertical shaft with hoisting

What type of access will you choose for deep horizontal (< 30⁰), vertical, steeply inclined (>70⁰) deposit?

a. slope with haulage c. vertical shaft with hoisting

b. d. incline d shaft with hoisting

b. at an angle to the strike of the deposit

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:

a. at an angle to the dip of the deposit

b. at an angle to the strike of the deposit

c. at an angle half the dip of the deposit

d. at an angle 45⁰ to the dip of the deposit

b. adequate ventilation

Multiple openings are necessary in coal mines because they provide

a. good access to the coal c. good recovery of the coal

b. adequate ventilation d. minimal distances

b. sill pillars

Excessive spacing or deficient spacing of draw points causes weight problems on:

a. undercuts c. crown pillars

b. sill pillars d. barrier pillars

c. funneling

 In actual caving, it is this action which dilutes the ore with waste during drawing:

a. draw control                 c. funneling

b. ellipsoid of motion       d. gravity flowing

a. 4, 000 – 5, 000 ft.

In a typical mining bench operation, 1 ft of ore face must be exposed for each 4 to 5 tons of required daily production. Supposing the required daily production is 20, 000 tons, the advance stripping of the bench face must continue until:

a. 4, 000 – 5, 000 ft. c. 2, 000 – 3, 000 ft.

b. 10, 000 – 12, 000 ft. d. 6, 000 – 7, 000 ft.

c. long range production planning ???

 Supplements the pit design and reserve estimation work that is usually done for feasibility and budget studies and is an important element of the decision making process:

a. long range mine planning c. long range production planning

b. short range mine planning d. short range production planning

d. Less than the time required to spot and load the entire truck fleet.

 For paper cycle balance in hauling, the cycle time for trucks must be:

a. half the time required to spot and loads the entire truck fleet.

b. Equal to the time required to spot and load the entire truck fleet.

c. Greater than the times required to spot and load the entire truck fleet.

d. Less than the time required to spot and load the entire truck fleet.

c. pit limits

In an open pit mine design, these are located on each section so the ore grade line supports a stripping ratio of corresponding to the break-even stripping ratio or allowable stripping ratio:

a. cut- off grades c. pit limits

b. pit slope angle d. bank slopes

a. from trucks performance charts on breaking and speeding ???

 Road-grades are based on the following criterion;

a. from trucks performance charts on breaking and speeding

b. soil cohesion

c. pit stability

d. all of the above

c. 8-12%

The best road gradient is between the ranges of:  

a. 7-12% c. 8-12%

b. 8-15 % d. 7-15%

a. base failure

 A failure that occurs below the toe of the bank:

a. base failure c. slope failure

b. slip circle failure d. toppling

c. slope failure

A failure that occurs intermediate between the crest and the toe:

a. base failure c. slope failure

b. slip circle failure d. toppling

b. 63-72⁰

 The recommended pit slope for the solid country rock is:

a. 60-80⁰ c. 45⁰

b. 63-72⁰  d. 50⁰

  d. 37⁰

The recommended pit slope for gravel is:

a. 22⁰ c. 16⁰

b. 35⁰          d. 37⁰

c. kerfs

 Hole patterns used only in soft to moderately hard rock (coal, potash, salt, etc.) to provide an additional free face for blasting. They lower the risk of explosion in a flammable atmosphere, such as in coal mines:

a. pyramid cut c. kerfs

b. burn cut d. V-cut

c. hole pattern

 What is the most important factor in designing blasting grounds?

a. property of rock                  c. hole pattern

b. drill hole diameter              d. type of explosive

d. boring machine

In underground mines, which of the following is classified as continuous mining?

A. shaft mocker c. slushier

b. loader d. boring machine

b. dredging

Which of the following is classified as continuous mining?

a. shovel c. scraper

b. dredging d. dragline

d. both b and c

Which of the following is classified as both excavating and rock fragmentation method?

a. ripping c. blasting

B. hydraulic king d. both b and c

d. 1.5-7 in. ???

 Diameter holes in underground mines are generally:

a. 10-20 in. c.12-24 in.

b. 1-4 in. d. 1.5-7 in.

b. 6-18 in.

Diameter holes in surface mines are generally:

a. 10-20 in. c. 12-24 in.

b. 6-18 in. d. 5-10 in.

a. borehole pressure

it is considered the most important explosive parameter in breaking and displacing rock in blasting, or otherwise known as explosion pressure:

a. borehole pressure c. detonating pressure

b. high explosive pressure d. high velocity pressure

 c. fuel shortage

An explosive produces toxic fumes when:

a. excess fuel                  c. fuel shortage

b. excess oxygen            d. balanced-oxygen content

d. jet

One of these is classified as both rock fragmentation and rock penetration.

a. ripping c. impact

b. drilling d. jet

b. rotary-drag bit drilling

In general, with the off-the-shelt technology, the lowest cost of penetration in soft rock is obtained using:

a. percussion drilling c. rotary-roller bit drilling

b. rotary-drag bit drilling d. rotary-percussion drilling

c. TNT

Which do you think is a fuel?

a. CaCO₃         c. TNT

b. AN                d. NG