Search results
Results from the WOW.Com Content Network
The ore deposit type is Polymetallic veins of hydrothermal origin. The mining method used is underhand cut and fill mining. [3] The mine's primary access and production are through the Silver Shaft, an 18-foot (5.5 m) diameter, concrete-lined shaft sunk to a depth of 6,200 feet (1,890 m), [4] [5] [6] over 2,800 feet (855 m) below sea level.
Cut and fill mining is an expensive but selective method, with the advantages of low ore loss and dilution. [4] Drift and fill is similar to cut and fill, except that it is used in ore zones, which are wider than the method of drifting will allow to be mined. In this case, the first drift is developed in the ore, and is backfilled using ...
In shrinkage stoping, mining proceeds from the bottom upwards, in horizontal slices (similar to cut and fill mining), with the broken ore being left in place for miners to work from. Because blasted rock takes up a greater volume than in situ rock (due to swell factor ), some of the blasted ore (approximately 40%) must be removed to provide ...
Room and pillar mining was one of the earliest methods used, [3] although with significantly more manpower. The room and pillar system is used in mining coal , gypsum , [ 4 ] iron , [ 5 ] limestone , [ 6 ] and uranium [ 7 ] ores, particularly when found as manto or blanket deposits, stone and aggregates , talc , soda ash , and potash . [ 8 ]
Hydraulic fill dams can be dangerous in areas of seismic activity due to the high susceptibility of the uncompacted, cohesion-less soils in them to liquefaction. The Lower San Fernando Dam [2] is an example of a hydraulic fill dam that failed during an earthquake. In these situations, a dam built of compacted soil may be a better choice.
No. 1 Oregon (13-0) is the only undefeated team in college football and opens as the favorite for the title at +325. However, there are three other teams with odds of +450 or better. And two of ...
A viral post shared on X claims Florida Republican Rep. Matt Gaetz purportedly made a tweet about “age gap dating.” View on Threads Verdict: False The claim is false. The purported tweet was ...
Principle of rope-shovel operation. [1]A power shovel, also known as a motor shovel, stripping shovel, front shovel, mining shovel or rope shovel, [2] is a bucket-equipped machine usually powered by steam, diesel fuel, gasoline or electricity and used for digging and loading earth or fragmented rock and for mineral extraction. [3]