London, November 30th: The London Metal Exchange (LME) has the following changes in inventory in the five trading days (in tons):
Variety Newer inventory November 30 November 29 November 28 November 25 November 24
Copper 71,175 + 250 +200 +375 -175 +1,025
Aluminum 622,125 +4,925 -2,500 -2,000 + 1,175 -3,850
Tin 12,820 - 5 +225 -245 -35 +130
Lead 42,850 - 575 remains flat -175 -225
Zinc 439,525 - 1,900 -2,700 -1,575 -1,575 -1,300
Nickel 23,016 + 684 + 144 +6 +390 +108
Aluminum Alloy 55,520 Flat - 20 -120 +120 -20
NASAAC 127,780 + 1,600 flat +80 flat -40
*NASAAC is a North American specialty aluminum alloy
The use of diamond cord core drill bits must be done step by step according to the requirements of the onion, not to be rushed, and the drill tool assembly, deployment, and maintenance must be done well.
The characteristics of rope core drill pipe are "three highs and one low", that is, high drilling speed, long life of diamond bit, high time utilization rate, low labor intensity of workers, so it is widely used in geological prospecting, coal field exploration and other fields. Among the whole set of drilling tools, the most important and most valuable is the drill pipe. The quality of the drill pipe is directly related to the use of the advantages of rope core drilling, and is also vital to the accurate acquisition of geological data and the control of drilling costs.
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