Orobel provide a perfect service in precious metals
We have solutions for all purchases, buyouts and precious metals recycling. Lire la suite […]
The history of precious metals refining
aqua regia Refining involves purifying a material or a metal In antiquity the process of purification of precious metals was cupellation. Lire la suite […]
Density weighing, a simple way to know the gold content of a precious metal
It is sometimes called hydrostatic weighing and principle we have just Archimedes, thanks to him, we know that any body immersed in water displaces its volume in water. Lire la suite […]
How to make a mini-refining and a form of gold assays ?
The refined gold as all precious metals is carried out using « aqua regia », an acid which is a mixture of nitric and hydrochloric acid. Lire la suite […]
About fakes and counterfeit krugerrand
[vc_row][vc_column][vc_column_text] For a number of years, false Krugerrands were produced and manufactured in China. Made mostly with a core of tungsten and gold plated. Lire la suite […]
How is a gold buyout in native, nugget or african flakes form ?
At Orobel for several years, we regularly buy gold exported from Africa. Lire la suite […]
Comment faire une balance de densité ou hydrostatique soi-même ?
Malgré que l’on puisse suspendre une pièce ou lingot d’or dans un pot d’eau sur une balance pour calculer son volume, cela n’est pas toujours possible à cause de la capacité maximum de la balance. En effet, le poids du pot et de l’eau dépasse parfois la capacité de balance. Lire la suite Lire la suite [...]
How a cupellation gold or fire assay works ?
The method is more accurate, with an accuracy of 2 to 3 parts per ten thousand (0.02%), is a method sometimes called cupellation to test feu.La Cupellation involves taking a small sample of object, usually a hole made in a crude bullion. Lire la suite […]
The origin of gold
Titillated by my many miners friends, I have to try to clarify their ideas about the origin of gold. One of the first qualities of gold miners, is toughness. Lire la suite […]
Le rapport de la DNGM le service des mines a Bamako au Mali
Sans être désigné comme un El Dorado, le Mali a toujours été perçu comme un pays possédant un potentiel minier certain, confirmé par de nombreuses références historiques et une activité artisanale séculaire encore intense de nos jours. Ainsi, l’or a fait de l’ancien Empire du Mali l’un des plus célèbres au Monde. Le fait historique Lire la suite [...]
