Argentum Aurum a écrit:
rialto a écrit:
Sérieux ???
C'est la règle "good delivery" établie par la LBMA. Cette règle est en usage dans la majorité des institutions financières. Et si Joubert ou X ou Y fait autrement c'est possible, mais il ne suit plus la règle générale.
- Je ne voudrais pas pinailler mais ... « The London Bullion Market Association » n'agrée que des entreprises rafinant au minimum 10 tonnes d'or et 30 tonnes par an, dont elle en publie la liste :
http://www.lbma.org.uk/pages/index.cfm?page_id=29&title=gold_list- La certification "Good Delivery Gold Bar" ne concerne que les barres produites par ces entreprises et répondant aux spécifications suivantes :
Citer:
Weight: minimum gold content: 350 fine troy ounces (approximately 10.9 kilograms)
maximum gold content: 430 fine troy ounces (approximately 13.4 kilograms)
The gross weight of a bar should be expressed in troy ounces, in multiples of 0.025, rounded down to the nearest 0.025 of a troy ounce.
Dimensions: the recommended dimensions for a Good Delivery gold bar are approximately as follows:
Length (Top): 250 mm +/- 40 mm Undercut *: 7% to 15%
Width (Top): 70 mm +/- 15 mm Undercut *: 15% to 30%
Height: 35 mm +/- 10 mm
La procédure de pesée de ces barres répond à des normes strictes :
Citer:
1. Weighing procedures
(a) Gold
Bars are weighed on a beam balance using brass or stainless steel weights of various sizes that are regularly inspected by the Inspector of Trading Standards. It is also acceptable to use an equal-arm magnetically damped precision balance or a modification unit to add magnetic damping to an existing beam balance.
If brass weights are used it is expected as a minimum requirement that a 400 troy ounce stainless steel weight is regularly used to cross-verify the accuracy of the 400 troy ounce brass weight. It is increasingly being recognised in the market that brass weights are susceptible to wear and tear and are not as accurate on an ongoing basis as stainless steel weights. The LBMA therefore recommends that, for the weighing of gold, all weights up to 50 ounces and the 400 ounce weight should be of stainless steel in preference to brass.
It is the practice of the LBMA and the London market to weigh gold bars in multiples of 0.025 of a troy ounce and therefore this is the smallest weight used.
For a gold bar to „turn the scale‟ it is necessary for the bar to cause the indicator needle on the beam balance to move a minimum of two divisions in favour of the bar when the correct weight is placed on the scales.
A division on a gold beam balance corresponds to 0.001 of a troy ounce. A gold bar must therefore weigh at least 0.002 of a troy ounce over the stated multiple of 0.025 for a bar to be said to „turn the scale‟.
If a bar does not „turn the scale‟ then the weight is reduced by 0.025 of a troy ounce.
While it is recognised that other procedures for weighing exist, the above procedure will be used in determining the weight of gold bars delivered into the London market.
Source
- Il résulte donc de ceci que la certification "Good Delivery Gold Bar" ne concerne que les barres dont il est question ci-dessus et produites par des rafineurs agréés.
- Les autres lingots ne sont pas soumis a des normes LBMA, prétendre à cette certification
pour de tels lingots est donc abusive.
- Il convient donc de se référer aux certificats de garantie ou d'essayeur accompagnant les autres lingots pour ce qui est des poids bruts et d'or fin ...
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