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Quiz 1 Flashcards

1
Q

Surface Mining Techniques : Name the 7 types of surface mining?

A
  1. Open Pit
  2. Strip Mining
  3. Quarrying
  4. Highwall (Auger)
  5. Mountaintop
  6. Placer
  7. Solution Mining
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2
Q

Surface Mining Techniques : For which type of geological deposits are open pit mostly used

A
  • vein type
  • disseminated metallic ores (hard rocks)
  • erratic stratigraphic units
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3
Q

Surface Mining Techniques : In open-pit when does reclamation start?

A

Until almost all ore production is completed

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4
Q

Surface Mining Techniques : What are the advantages (2) and disadvantages(3) of the conventiional pushback

A

A:
1. allows to perform larger areas
2. more flexible and less complicated road design
D:
1. NPV to be generated will be less
2. less flexibility in scheduling operations
3. less opportunity to blend ores

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5
Q

Surface Mining Techniques : What pratice is shown here?

A

Sequential Pushbacks

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6
Q

Surface Mining Techniques : What characteristics is strip mining ideally applied to?

A
  1. relatively horizontal (tabular)
  2. bedded
  3. shallow
  4. uniform
  5. Continuous
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7
Q

Surface Mining Techniques : What is the main indicator of performance for strip mining?

A

stripping ratio (tonne of waste rock per tonne of ore)

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8
Q

Surface Mining Techniques : In what are strip mine is typically divided into?

A

long rectangular blocks (sometimes referred to as panels) that are mined in sequence

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9
Q

Surface Mining Techniques : Name main characteristics 3 of strip mining?

A
  1. Production rates are high (economies of scale)
  2. Safety is high
  3. excavation and loading can be conducted in a continuous way
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10
Q

Surface Mining Techniques : What is contour mining?

A

Strip mining narrow zones in a mountainous terrain

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11
Q

Surface Mining Techniques : Name the 3 types of contour mining?

A
  1. Haulback
  2. Box-cut
  3. Blockcut
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12
Q

Surface Mining Techniques : Describe haulback contour mining.

A

overburden material is hauled by trucks and placed directly in the void created by the removal of coal. Highwalls are eliminated and near original surface is restored

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13
Q

Surface Mining Techniques : Describe box-cut contour mining.

A

Box-cut or terrain is created through overburden to access to seam. This
box is extended along with strike direction

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14
Q

Surface Mining Techniques : Describe block-cut contour mining.

A

In this method, overburden blocks, which are wider than 20 m, are removed as
a unit and disposed in mined-out voids.

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15
Q

Surface Mining Techniques : Why do we want keep the stripping ratio as constant as possible?

A

Since equipment and coal processing unit have constant capacities, a change in stripping ratio will cause capacity utilization issues.

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16
Q

Surface Mining Techniques : Give the break-even Stripping Ratio formula.

A
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17
Q

Surface Mining Techniques : Give the overall Stripping ratio formula.

A
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18
Q

Surface Mining Techniques : Name the 2 types of Quarrying activties.

A
  1. Aggregate mining (e.g., construction materials (gravel and sand))
  2. Dimension stone mining (e.g., marble, slate)
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19
Q

Surface Mining Techniques : Name the 5 factors affecting quarry selection since quarried material is cheap

A
  1. Large overburden removal cost cannot be paid off
  2. There should be sufficient reserve
  3. There should not be a dewatering cost
  4. Resource should be close to the market
  5. Environmental problems should be kept in minimum
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20
Q

Surface Mining Techniques : In Quarrying for Dimension Stone how is the Rock is cut (6) ?

A
  1. Diamond wire saw
  2. Jet burning
  3. Diamond saw blade
  4. Laser cutting
  5. Water jet
  6. Drilling and blasting
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21
Q

Surface Mining Techniques : What the 2 Criteria used for sawability?

A
  1. Cutting or production rate of stone blocks and slabs in m2
    /h. (determined by rock properties)
  2. Wear rate of diamond tools
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22
Q

Surface Mining Techniques : When is Auger and Highwall Mining used?

A

When contour strip mining has been completed and the removal of overburden to access additional coal no longer becomes economically feasible

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23
Q

Surface Mining Techniques : What is the most challenging part of mountain top mining?

A

the development of roads to access the areas that will be mined

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24
Q

Surface Mining Techniques : Name envionmental downsides of mountain top mining (3)?

A
  1. Mined area cannot be reclaimed or restored to original ground in an easy way
  2. Clearing before blasting leads to removal of trees and vegetations
  3. It causes biodiversity loss and adverse effect on water quality
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25
Surface Mining Techniques : What is a placer?
Placer is a gravel deposit in heavy minerals, especially gold particles and gemstones
26
Surface Mining Techniques : What is placer mining?
Placer mining comprises various mining methods using water to recover valuable ore from the surrounding sediment
27
Surface Mining Techniques : Name 2 types of placer mining.
1. Hydraulic mining 2. Dredging mining
28
Surface Mining Techniques : What is Hydraulic mining? Where is used?
Powerful jet of water to dislodge minerals present in unconsolidated material. Concentration from the tailings of old mines
29
Surface Mining Techniques : On what depends the application of Hydraulic mining (3)?
1. availability of water, 2. the amenability of the rock to be slurried 3. pumpable.
30
Surface Mining Techniques : Name 4 types of dredge mining equipment. 2 types for last
1. Draglines & Backhoes 2. Bucket Wheel Dredge 3. Suction Cutter Dredge 4. Bucketline Dredge (Headline/Spud Dredge)
31
Surface Mining Techniques : What solution mining used for?
mining method used to recover minerals through boreholes drilled into a deposit.
32
Surface Mining Techniques : What are the 3 types of solution mining?
1. in-situ 2. heap 3. tank
33
Surface Mining Techniques : What is in-situ solution mining?
The in-situ leaching involves drilling holes into the deposit and then injecting a lixiviant or leaching solution to dissolve the orebody.
34
Surface Mining Techniques : When is in-situ solution mining used (2)?
1. mineral processing is very expensive 2. waste contains low quantity of valuable metal
35
Surface Mining Techniques : Name the steps of Heap Leaching solution mining (5)?
1. Ore is crushed (>5 mm) and/or agglomerated 2. It is stacked over an engineered impermeable pad 3. It is wetted with lixiviant* (solvent) chemicals under atmospheric conditions 4. Leachate (metal loaded solutions) is collected for metal recovery processes 5. The solution is processed to recover the metals
36
Name the Two forms of Sample preparation method and Laboratory sampling procedures
1. Coning and Quartering 2. Riffling Method
37
Explain Coning and Quartering
38
Explain Rifling.
39
Explain accuracy and precistion
Accuracy: How close to the real value Precision: Repeatable results
40
Define a Lot
the total collection of material for which an estimate of some component is required.
41
Define a Component:
the property that is to be estimated using a sample: e.g., grade, density, moisture, etc
42
Define a Sample
the part of a lot on which a determination of a component will be carried out, where each part of the lot had an equal probability of being selected into the sample
43
Define a Specimen
the part of a lot on which a determination of a component will be carried out, but for which the rule of equal probability of selection has not been respected
44
Define a Increment
the part or whole of a sample, selected from the lot with a single cut of the sampling device. A number of increments may be combined to form one sample.
45
Name factors that cumulatively affect the precision of any assay result (4)
1. the mass of material being assayed 2. the homogeneity of the material being assayed 3. the concentration of the component of interest 4. matrix effects due to other elements in solution
46
Name the 7 steps of Shaw’s sampling protocol.
1. one quarter drill core 2. Jaw crusher 3. Cone crusher 4. Riffle 5. Pulverizer 6. Trowel 7. Enveloppes
47
According to Gy The magnitude of sample preparation error is related to what (3)?
1. Particle size 2. Weight of subsample 3. Mineralogical composition of ore being sampled
48
What is liberation?
It is an event that releases valuable mineral from unwanted minera
49
What is a bulk density?
A density that takes voids into account
50
Give the tonnage of block formula
51
The average bulk density may be called as a conversion factor. Why is it rarely appropriate to use a single conversion factor for an entire deposit.
The variations in mineralogy and physical character are significant throughout a mineral deposit
52
Name methods for estimating bulk density (5).
1. Archimedes-type measurements on whole core (in the field) or core or rock fragments 2. Lab measurements of pulverized material (generally unsatisfactory in resource/reserve estimation 3. Physical measurements for long lengths of whole core on-site (dimensions and weight) 4. Stoichiometry based on whole-rock chemical analyses 5. Gamma–gamma logging of drill holes
53
Suppose that the central part of a layered, massive sulfide deposit consists of 10 (vol)% sphalerite (s.g. = 4.0), 45 (vol)% pyrrhotite (s.g. = 4.6) and 45 (vol)% pyrite (s.g. = 5.1). What is the Bulk density?
Bulk density = 4.0 x 0.10 + 4.6 x 0.45 + 5.1 x 0.45 = 4.77
54
What does compation reflect?
Compaction reflects the decrease in volume of material from its blasted state to the volume it occupies once it is placed on a dump or stockpile.
55
What is the swell factor of this?
56
What is the angle of repose
angle of repose is defined as the steepest angle at which unconsolidated material (e.g., blasted or crushed rock) can adapt without slumping when it is placed in a pile
57
2 parameters that increase/descrease angle of repose.
Increase: 1. Moisture content 2. Particle roughness Decrease: 1. Size of the particles 2. Lifting velocity
58
What is the main source of error in an estimation?
The variability of the grades within the deposit
59
What are the sources of error or the factors affecting variability
1) Continuity 2) Range (Zone of influence or distance) 3) Structural and small scale variation 4) Degree of homogeneity
60
Explain range in factors affecting variability.
the influence of a sample extends for a certain distance. After this distance, this sample has no effect on estimation
61
Name the 3 Sources of small scale variation.
1. Geological structures which are smaller than the sampling grid 2. Random phenomena such as weathering 3. Sampling and data preparation errors
62
Explain Structural variation in factors affecting variability.
It refers to the variation associated with geological structures which are larger than the sampling or drilling grid.
63
Explain Structural variation in factors affecting variability.
the estimation error may vary with changes in geological conditions. The degree of homogeneity may depend on direction
64
The semi-variogram provides information about 4 things.
1. Zone of influence or range 2. Continuity 3. Structural and small-scale variation 4. Anisotropies
65
What are the 4 Semi-variogram parameters
1. Nugget effect (C0) 2. Sill (C0 + C1) 3. Range 4. Anisotropies (when generate for different directions)
66
Compute weights using inverse distance weighted interpolation

Surface Mining (3 decks)

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