L5 Ore Deposits Classification

What are the four main bases for classifying ore deposits?

• Origin, mineralogy, host rocks, and formation processes
• Depth, temperature, pressure, and composition
• Color, texture, hardness, and structure
• Age, location, size, and accessibility

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

• Skarn
• Chromite
• Placer gold
• Banded iron formations

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

• Magmatic ore deposits
• Hydrothermal ore deposits
• Sedimentary ore deposits
• Metamorphic ore deposits

Porphyry deposits are a subtype of which ore deposit class?

• Hydrothermal
• Magmatic
• Sedimentary
• Supergene

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

• Sedimentary ore deposits
• Magmatic ore deposits
• Hydrothermal ore deposits
• Metamorphic ore deposits

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

• Supergene ore deposits
• Metamorphic ore deposits
• Hydrothermal ore deposits
• Sedimentary ore deposits

What is an example of a sedimentary ore deposit?

• Banded iron formations (BIFs)
• Chromite
• Skarn
• Platinum group elements

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

• Supergene ore deposits
• Magmatic ore deposits
• Hydrothermal ore deposits
• Metamorphic ore deposits

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

• Vein deposits
• Layered mafic intrusions
• Magmatic metasomatic deposits
• Epithermal deposits

Disseminated deposits are characterized by:

• Ore minerals spread diffusely throughout the host rock
• Ore minerals concentrated in fractures
• Large, homogeneous bodies of ore
• Thin layers of ore minerals within host rocks