A technique for extracting gold that has been outlawed in the United States is
A)contour strip mining
B)hydraulic mining
C)mountaintop removal
D)subsurface mining
E)All of these mining methods are still legal for extracting gold in the United States.

Question

Quizplus · Accepted Answer

Hydraulic mining, also known as "Gold Rush-era mining" involves directing high-pressure jets of water at gold-bearing gravel or dirt, causing it to disintegrate and wash away, leaving the heavier gold particles behind. While it was once widely used in the Western US during the gold rush era, it has since been outlawed due to its environmental and social impacts.

A Technique for Extracting Gold That Has Been Outlawed in the United