Raw Gold Dore Bars For Sale

详情

Dore Gold Bar Specifications Composition

• Gold Content: Typically ranges between 50% to 90% gold, depending on the source ore and mining process.
• Impurities:
  • Silver (Ag): Often the second most abundant metal, ranging from 5% to 40%.
  • Copper (Cu): Commonly present, ranging from 1% to 10%.
  • Platinum Group Metals (PGMs): May include small amounts of platinum (Pt), palladium (Pd), and rhodium (Rh).
  • Base Metals: Such as iron (Fe), lead (Pb), zinc (Zn), and nickel (Ni), typically in trace amounts.
  • Other Elements: May include traces of mercury (Hg), arsenic (As), and antimony (Sb), depending on the ore source.

• Shape: Usually rectangular or trapezoidal, but can vary depending on the casting process.
• Size: Common weights range from 5 kg to 25 kg, though larger bars may also be produced.
• Surface: Rough and uneven, often with visible impurities, slag, or oxidation layers.
• Color: Varies depending on the composition, often appearing dull yellow or greenish due to impurities like silver and copper.

• Dore gold bars are not fully refined, so their purity is lower than that of refined gold bars (e.g., 99.99% pure gold).
• The gold content is typically measured in karats or as a percentage (e.g., 70% gold).

• Assay Methods: Impurities are analyzed using techniques such as:
  • Fire Assay: Traditional method for determining gold content.
  • X-Ray Fluorescence (XRF): Non-destructive method for analyzing metal composition.
  • Inductively Coupled Plasma (ICP) Spectroscopy: Used for precise measurement of trace elements.
• Typical Impurity Levels:
  • Silver: 5% to 40%
  • Copper: 1% to 10%
  • Platinum Group Metals: 0.1% to 2%
  • Base Metals: 0.1% to 5%

• Dore bars may bear basic markings such as:
  • Weight (in kilograms or troy ounces).
  • Assay results (gold content percentage).
  • Mine or refinery identification.
  • Batch or lot number.

• Dore gold bars are typically sent to refineries for further processing to produce high-purity gold bars (e.g., 99.99% pure).
• They are not traded on the open market like refined gold bars but are instead used as an intermediate product in the gold supply chain.
• Gold dor making process

• Produced directly from gold mines as part of the initial refining process.
• The bars are cast in molds after the gold ore is smelted.