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Open Pit Mining
Drilling is used in almost every type of mining to sample and determine the extent of a the deposit. Drilling is used for actual extraction of salt (by solution mining), petroleum, and natural gas.
The safest and cheapest type of mining is surface mining.
Ruby Mining
Saddle-reef gold is found in Hill End, New South Wales. This occurs in quartz veins.
Veins
they have parallel veins...
Because one type of mining may not be possible, may not be safe, or may not be economically feasible. Underground room-and-pillar mining for coal can only remove about 30% of the coal present, and requires a fairly thick seam of coal. Surface mining requires removing overburden that is covering the mineral you are mining- if that overburden is 500 ft thick, you could not afford the expense of moving that much rock. The Homestake gold mines were about 8000 ft deep- and followed the path of veins of high grade ore. Different geology, different needs.
Strip mining is the most effective way?
The type of deposit that results from a turbidity current is a sediment deposit, or a turbidite. This type of deposit makes the water denser, which makes it sink deeper while the clearer water rises.
"For deposit only" is a restrictive endorsement.
A mining industry is a mining business or a type of job out of all the other jobs.