What are placer deposits and how do they form? Where do they typically occur?

What are auriferous gravels?

What is hydraulic mining? What was the impact on streams in regions undergoing hydraulic mining?

What is a monitor?

Why did flooding occur due to hydraulic mining?

What is aggradation?

What other element was mined in California and used in gold mining?

What are mine tailings?

What is acid mine drainage? What contaminants are carried in acid mine drainage and bioaccumulate in fish?

What is aggregate mining?

How does aggregate mining affect the erosion occurring in streams?