What is blast hole stoping?
When the dip of a deposit is steep (greater than about 55°), ore and waste strong, ore boundaries regular, and the deposit relatively thick, a system called blasthole stoping is used. A drift is driven along the bottom of the ore body, and this is eventually enlarged into the shape of a trough.
What is a stope in mining?
A stope is a dugout tunnel or space that contains the ore that is being mined. Clear stopes are essential for a mining industry operation to run smoothly. The stope provides direct access to the orebody and routes ore and waste in an underground mine.
What is sublevel stoping?
Sublevel stoping is a mining method in which ore is blasted from different levels of elevation but is removed from one level at the bottom of the mine. Before mining begins, an ore pass is usually drilled from a lower to a higher elevation.
What is a slot drive in mining?
Ramps usually are driven downward. Shaft: Vertical or inclined underground opening through which a mine is worked. Slot: Vertical or inclined ore section excavated to open up for further stoping. Stope: Underground excavation made by removing ore from surrounding rock.
What do Blast Hole Drillers do?
Blast hole drilling is a technique used in mining whereby a hole is drilled into the surface of the rock, for the purposes of packing it with explosives and detonation. The intention is to induce cracks in the inner geology of the surrounding rock, in order to facilitate further drilling and associated mining activity.
Why are blasting holes plugged at the top?
Stemming plugs are placed in the stemming zone of the blast hole to increase the containment of the explosive gasses. The resultant increase in explosive energy is transmitted to the rock mass and is utilized to fragment the rock more efficiently.
What is long hole open stoping?
Long hole stoping as the name suggests uses holes drilled by a production drill to a predetermined pattern as designed by a mining engineer. Long hole stoping is a highly selective and productive method of mining and can cater for varying ore thicknesses and dips (0 – 90 degree).
How much do Blast Hole Drillers make?
“With that in mind, a quality surface Blast Hole or Exploration Driller can earn anywhere from $55/hr to $65/hr,” he said. “There are even higher rates for those drilling underground, with $65/hr (Diamond) and $75/hr (Production) being offered for some contract roles.”
What is stemming in a blast hole?
Stemming is normally a rock or sand material that is generally placed on top of the explosive in a blasthole. Many blasters use stemming, as it can reduce the air overpressure levels from a blast by more than 98 percent when properly contained.
What is stemming blasting?
Stemming is a material that is put inside of a blast hole to help prevent gases from escaping. While stemming is typically put in the top of a blast hole, it can also be used to help bridge mud seams or weak layers. Improperly placed stemming can greater decrease fragmentation size.
Why is it called a stope?
Each horizontal working is called a stope because when a number of them are in progress, each working face under attack assumes the shape of a flight of stairs.
What is tailgate mining?
Gate roads are driven to the back of each panel before longwall mining begins. The gate road along one side of the block is called the maingate or headgate; the road on the other side is called the tailgate.
What are three mining methods?
There are four main mining methods: underground, open surface (pit), placer, and in-situ mining. Underground mines are more expensive and are often used to reach deeper deposits.
What is blasthole stoping in geology?
When the dip of a deposit is steep (greater than about 55°), ore and waste strong, ore boundaries regular, and the deposit relatively thick, a system called blasthole stoping is used. A drift is driven along the bottom of the ore body, and this is eventually enlarged into the shape of a trough.
What is blasthole and shrinkage stoping?
Blasthole stoping, with the drilling of long, parallel blastholes and the loading of blasted ore from draw points located along a trough at the bottom of the stope. Shrinkage stoping is used in steeply dipping, relatively narrow ore bodies with regular boundaries.
Why did Robert Frost stop by the woods on a snowy evening?
The poem, ‘Stopping by Woods on a Snowy Evening’, explores the motivations of the poet, the inherent moods of the narrator, and his fixation with woods for an inner reason. Robert Frost is known as a ‘regional poet, willing to forge his own path and ignore the poetic trends of his time.
What is the main idea of stopping by the woods?
Frost’s ‘Stopping by Woods on a Snowy Evening’ taps on several themes such as life, death, commitment, pessimism vs optimism, and darkness. The main theme of this piece is the journey of life. It is present throughout the poem and highlighted in the last few lines. Why does the horse think it strange to stop in the woods?