Sampling
Sampling
To ensure 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