International Precious Metal Refiners

COMPREHENSIVE GOLD AND SILVER REFINING AT THE HUB OF THE WORLD MARKET

SAMPLING & ASSAYING

To assure accurate determination of precious metals content, IPMR homogenizes, samples and assays each lot of material received from its customers.

Sampling Preparation:

  • Material examined upon arrival
  • Melted and homogenized (process based on material)
  • Samples sent to laboratory

Sampling

  • Material sampled in molten state
  • Sample is divided into three parts: IPMR, customer, arbitration if necessary
    • Refinery sample sent to the laboratory

Assaying

  • Fire assay process for gold
  • Wet gravimetric or instrumental procedures for silver
  • Assay laboratory is designed to meet or exceed NADCAP/ISO 17025 requirements

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