Quiz about L5 Ore Deposits Classification

Question 1

What are the four main bases for classifying ore deposits?

Accepted Answer

Origin, mineralogy, host rocks, and formation processes

Answer

Depth, temperature, pressure, and composition

Answer

Color, texture, hardness, and structure

Answer

Age, location, size, and accessibility

Question 2

Which of the following is an example of a magmatic ore deposit?

Accepted Answer

Chromite

Answer

Skarn

Answer

Placer gold

Answer

Banded iron formations

Question 3

Which type of ore deposit forms from circulating hot, metal-rich fluids?

Accepted Answer

Hydrothermal ore deposits

Answer

Magmatic ore deposits

Answer

Sedimentary ore deposits

Answer

Metamorphic ore deposits

Question 4

Porphyry deposits are a subtype of which ore deposit class?

Accepted Answer

Hydrothermal

Answer

Magmatic

Answer

Sedimentary

Answer

Supergene

Question 5

Which ore deposit type forms from chemical precipitation or sedimentary processes?

Accepted Answer

Sedimentary ore deposits

Answer

Magmatic ore deposits

Answer

Hydrothermal ore deposits

Answer

Metamorphic ore deposits

Question 6

Which ore deposit type is associated with metamorphic processes, often involving fluid movement?

Accepted Answer

Metamorphic ore deposits

Answer

Supergene ore deposits

Answer

Hydrothermal ore deposits

Answer

Sedimentary ore deposits

Question 7

What is an example of a sedimentary ore deposit?

Accepted Answer

Banded iron formations (BIFs)

Answer

Chromite

Answer

Skarn

Answer

Platinum group elements

Question 8

Which type of ore deposit forms through the weathering and enrichment of primary mineral deposits?

Accepted Answer

Supergene ore deposits

Answer

Magmatic ore deposits

Answer

Hydrothermal ore deposits

Answer

Metamorphic ore deposits

Question 9

Which of the following is a type of ore deposit classified based on shape and form?

Accepted Answer

Vein deposits

Answer

Layered mafic intrusions

Answer

Magmatic metasomatic deposits

Answer

Epithermal deposits

Question 10

Disseminated deposits are characterized by:

Accepted Answer

Ore minerals spread diffusely throughout the host rock

Answer

Ore minerals concentrated in fractures

Answer

Large, homogeneous bodies of ore

Answer

Thin layers of ore minerals within host rocks

Question 11

Which of the following is an example of an igneous-hosted ore deposit?

Accepted Answer

Chromite in ultramafic rocks

Answer

Placer gold

Answer

Banded iron formations

Answer

Mississippi Valley-type lead-zinc deposits

Question 12

Metamorphic-hosted ore deposits are commonly associated with which geological feature?

Accepted Answer

Greenstone belts

Answer

Banded iron formations

Answer

Ultramafic intrusions

Answer

Kimberlite pipes

Question 13

Which ore deposit type is associated with orogenic belts?

Accepted Answer

Orogenic gold deposits

Answer

Porphyry copper deposits

Answer

VMS deposits

Answer

Mississippi Valley-type deposits

Question 14

Which type of ore deposit forms at divergent plate boundaries, typically along mid-ocean ridges?

Accepted Answer

VMS deposits

Answer

BIFs

Answer

Orogenic gold deposits

Answer

Epithermal gold deposits

Question 15

Which tectonic setting is associated with porphyry copper deposits?

Accepted Answer

Continental and island arcs

Answer

Stable cratonic regions

Answer

Passive margins

Answer

Foreland basins

Question 16

Which deposit type is characterized by iron-oxide Cu-Au (IOCG) mineralization?

Accepted Answer

Iron-oxide copper-gold deposits

Answer

Orogenic gold deposits

Answer

Porphyry copper deposits

Answer

Epithermal gold deposits

Question 17

Which ore deposit type forms in mid-ocean ridge settings and is often associated with black smokers?

Accepted Answer

VMS deposits

Answer

Orogenic gold deposits

Answer

Epithermal deposits

Answer

Kimberlite pipes

Question 18

Which type of deposit is typically associated with convergent margins and contains high concentrations of copper, molybdenum, and gold?

Accepted Answer

Porphyry systems

Answer

Epithermal systems

Answer

Mississippi Valley-type deposits

Answer

Skarn deposits

Question 19

Which geological feature often hosts large volumes of mineralized veins in porphyry systems?

Accepted Answer

Stockwork veins

Answer

Kimberlite pipes

Answer

BIFs

Answer

Pegmatites

Question 20

Which alteration zone in porphyry deposits typically contains the highest concentrations of metals?

Accepted Answer

Potassic zone

Answer

Phyllic zone

Answer

Argillic zone

Answer

Propylitic zone

Question 21

What is a key characteristic of porphyry deposits?

Accepted Answer

Large, low-grade ore bodies

Answer

High metal concentrations in small ore bodies

Answer

Deep-sea formation

Answer

Formation at high pressure and temperature

Question 22

Which type of alteration zone is typically closest to the core of a porphyry deposit?

Accepted Answer

Potassic

Answer

Phyllic

Answer

Argillic

Answer

Propylitic

Question 23

What geological structure often hosts the ore in porphyry systems?

Accepted Answer

Stockwork veins

Answer

Kimberlite pipes

Answer

Banded iron formations

Answer

Magmatic intrusions

Question 24

Porphyry deposits are most commonly associated with which plate boundary type?

Accepted Answer

Convergent

Answer

Divergent

Answer

Transform

Answer

Passive margins

Question 25

In porphyry deposits, which metal is typically found in the core zone?

Accepted Answer

Molybdenum

Answer

Lead

Answer

Copper

Answer

Gold

Question 26

Which of the following processes contributes to the formation of porphyry deposits?

Accepted Answer

Magmatic differentiation

Answer

Evaporation

Answer

Erosion of sedimentary rocks

Answer

Sedimentary exhalation

Question 27

Which exploration technique is commonly used to identify sulfide-rich ore bodies in porphyry systems?

Accepted Answer

Electromagnetic surveys

Answer

Gravity surveys

Answer

Seismic surveys

Answer

Thermal imaging

Question 28

What is the primary purpose of reverse circulation (RC) drilling in exploration for porphyry deposits?

Accepted Answer

To quickly and cost-effectively obtain drill samples

Answer

To analyze surface rocks

Answer

To extract continuous core samples

Answer

To map subsurface geophysical anomalies

Question 29

In porphyry exploration, which of the following is typically analyzed for metal anomalies?

Accepted Answer

Soil samples

Answer

Magnetic anomalies

Answer

Igneous rock outcrops

Answer

Banded iron formations

Question 30

Epithermal deposits typically form in which part of the Earth's crust?

Accepted Answer

Upper crust

Answer

Lower crust

Answer

Mantle

Answer

Mid-ocean ridges

Question 31

Which mineral is commonly associated with epithermal low-sulfidation deposits?

Accepted Answer

Quartz

Answer

Chromite

Answer

Magnetite

Answer

Ilmenite

Question 32

High-sulfidation epithermal deposits are typically enriched in which elements?

Accepted Answer

Gold, silver, copper

Answer

Zinc, lead, iron

Answer

Platinum, palladium, rhodium

Answer

Cobalt, nickel, manganese

Question 33

What geological process is key to the formation of epithermal gold and silver deposits?

Accepted Answer

Boiling of hydrothermal fluids

Answer

Magma cooling

Answer

Erosion of host rocks

Answer

Deep-sea sedimentation

Question 34

Which geological feature often controls the movement of hydrothermal fluids in epithermal systems?

Accepted Answer

Faults and fractures

Answer

Plutonic intrusions

Answer

Sedimentary basins

Answer

Banded iron formations

Question 35

Low-sulfidation epithermal deposits are commonly associated with which alteration type?

Accepted Answer

Quartz-adularia-sericite alteration

Answer

Skarn alteration

Answer

Propylitic alteration

Answer

Argillic alteration

Question 36

Volcanogenic massive sulfide (VMS) deposits typically form in which tectonic environment?

Accepted Answer

Mid-ocean ridges

Answer

Convergent margins

Answer

Stable cratonic basins

Answer

Continental shelves

Question 37

Which metals are typically found in VMS deposits?

Accepted Answer

Copper, zinc, lead

Answer

Gold, silver, platinum

Answer

Nickel, cobalt, manganese

Answer

Uranium, thorium, rare earth elements

Question 38

Which geological process is responsible for the formation of VMS deposits?

Accepted Answer

Hydrothermal circulation in volcanic settings

Answer

Magma crystallization in ultramafic intrusions

Answer

Chemical precipitation in sedimentary basins

Answer

Weathering of primary mineral deposits

Question 39

What type of alteration commonly surrounds VMS deposits?

Accepted Answer

Sericite-chlorite-quartz alteration

Answer

Potassic alteration

Answer

Skarn alteration

Answer

Argillic alteration

Question 40

Which feature often marks the surface expression of a VMS deposit?

Accepted Answer

Gossans

Answer

Kimberlites

Answer

Pegmatites

Answer

Porphyritic intrusions

Question 41

VMS deposits are typically zoned with which metal concentrated near the hydrothermal vent?

Accepted Answer

Copper

Answer

Zinc

Answer

Lead

Answer

Iron

Question 42

What is the primary metal found in Mississippi Valley-Type (MVT) deposits?

Accepted Answer

Lead

Answer

Copper

Answer

Gold

Answer

Iron

Question 43

Which type of rock typically hosts MVT deposits?

Accepted Answer

Carbonates (limestone and dolostone)

Answer

Ultramafic rocks

Answer

Granitic intrusions

Answer

Banded iron formations

Question 44

MVT deposits are formed from which type of fluid?

Accepted Answer

Low-temperature basinal brines

Answer

High-temperature magmatic fluids

Answer

Hydrothermal fluids from subduction zones

Answer

Meteoric water infiltrating fault zones

Question 45

Which tectonic setting is associated with the formation of MVT deposits?

Accepted Answer

Stable continental interiors

Answer

Passive margins

Answer

Mid-ocean ridges

Answer

Convergent margins

Question 46

What is the main method for identifying subsurface MVT deposits?

Accepted Answer

Drilling and analyzing core samples

Answer

Geochemical surveys of surface rocks

Answer

Remote sensing and aerial photography

Answer

Surface mapping of gossans

Question 47

Which mineral is commonly found in association with lead and zinc in MVT deposits?

Accepted Answer

Barite

Answer

Quartz

Answer

Chromite

Answer

Hematite

Question 48

Which process is most important for the formation of skarn deposits?

Accepted Answer

Metasomatism

Answer

Sedimentary deposition

Answer

Magma crystallization

Answer

Subduction zone tectonics

Question 49

Skarn deposits are most commonly associated with which type of host rock?

Accepted Answer

Carbonate rocks

Answer

Ultramafic rocks

Answer

Banded iron formations

Answer

Shale and sandstone

Question 50

Which minerals are typically formed in skarn deposits?

Accepted Answer

Garnet, pyroxene, and wollastonite

Answer

Chromite, magnetite, and ilmenite

Answer

Pyrite, chalcopyrite, and molybdenite

Answer

Quartz, feldspar, and mica

Question 51

What is the typical host rock for porphyry copper deposits?

Accepted Answer

Porphyritic intrusive rocks

Answer

Carbonates

Answer

Ultramafic intrusions

Answer

Shales and sandstones

Question 52

In porphyry systems, which metal is typically found in the outer zones?

Accepted Answer

Lead

Answer

Zinc

Answer

Copper

Answer

Molybdenum

Question 53

What is the typical size and grade of porphyry copper deposits?

Accepted Answer

Large and low-grade

Answer

Small and high-grade

Answer

Small and low-grade

Answer

Large and high-grade

Question 54

What type of survey is commonly used to detect magnetic anomalies associated with porphyry intrusions?

Accepted Answer

Magnetic surveys

Answer

Electromagnetic surveys

Answer

Seismic surveys

Answer

Gravity surveys

Question 55

Which mineral is most commonly associated with porphyry copper deposits?

Accepted Answer

Chalcopyrite

Answer

Magnetite

Answer

Chromite

Answer

Pyroxene

Question 56

Which type of alteration zone in porphyry deposits is often the most economically valuable?

Accepted Answer

Potassic

Answer

Phyllic

Answer

Argillic

Answer

Propylitic

Question 57

What is a key characteristic of epithermal deposits?

Accepted Answer

They form near the Earth's surface

Answer

They are associated with ultramafic rocks

Answer

They are exclusively found at great depths

Answer

They only contain iron ores

Question 58

Which type of hydrothermal deposit is often enriched in gold and silver?

Accepted Answer

Epithermal deposits

Answer

VMS deposits

Answer

Skarn deposits

Answer

BIF deposits

Question 59

Which type of fluid is involved in the formation of low-sulfidation epithermal deposits?

Accepted Answer

Neutral to slightly acidic fluids

Answer

Highly acidic fluids

Answer

Alkaline magmatic fluids

Answer

Meteoric water

Question 60

What is the primary metal extracted from high-sulfidation epithermal deposits?

Accepted Answer

Gold

Answer

Silver

Answer

Zinc

Answer

Platinum

Question 61

Which alteration type is associated with high-sulfidation epithermal deposits?

Accepted Answer

Advanced argillic alteration

Answer

Quartz-adularia-sericite alteration

Answer

Propylitic alteration

Answer

Skarn alteration

Question 62

Which geological structure is commonly associated with epithermal ore deposits?

Accepted Answer

Faults and fractures

Answer

Ultramafic intrusions

Answer

Kimberlite pipes

Answer

Banded iron formations

Question 63

Which tectonic setting is associated with the formation of VMS deposits?

Accepted Answer

Divergent plate boundaries

Answer

Convergent plate boundaries

Answer

Passive margins

Answer

Continental rift zones

Question 64

What is the typical metal zonation pattern in VMS deposits?

Accepted Answer

Copper near the vent, zinc and lead farther away

Answer

Lead near the vent, copper and zinc farther away

Answer

Silver near the vent, gold and copper farther away

Answer

Zinc near the vent, lead and copper farther away

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