USA HISTORY

Detailed explanation-1: -Hydraulic mining became the largest-scale, and most devastating, form of placer mining. Water was redirected into an ever-narrowing channel, through a large canvas hose, and out through a giant iron nozzle, called a “monitor".

Detailed explanation-2: -Hydraulic mining was a variation on ground sluicing where the water delivered to the site would be shot through a nozzle at high pressure onto the face of the cliff, thereby washing away tons of boulders, gravel, dirt, and, in the hopes of the miners, ounces of gold.

Detailed explanation-3: -In the hydraulic mining of gold the rebounding stream of water and mineral fragments is directed into sluices in which the gold settles behind baffles but the lighter waste matter is washed away. In hydraulic mining of coal the water simply breaks the coal from the seam and washes it to a collecting point.

Detailed explanation-4: -The Romans used a technique known as hushing, which is a method of hydraulic mining that uses water to erode the rock. This would be accomplished by using holes to funnel water into the area, thus breaking it up.

Detailed explanation-5: -Hydraulic mining utilizes the force of water sprayed under high pressure to extract coal. Hydraulic mining utilizes continuous miners to mine entries to gain access to production panels. Once a production panel is established, high-pressure water cannons are used to break the coal off the face.