Service Overview
Our laboratory utilizes an extensive array of testing techniques, including traditional Fire Assay, potentiometric methods, XRF, SPARK, and ICP spectrometry. Testing methods are applied on a case-by-case basis and may involve various techniques, either individually or in combination, as appropriate. We maintain close communication with our Clients and their Representatives and collaborate effectively with relevant public authorities.
ASSAYING ANALYSIS
- 1st Phase
- 2nd Phase
- 3rd Phase
- 4th Phase
- 5th Phase
- 6th Phase
- 7th Phase
The laboratory will clean and drill the samples, placing the drillings from each sample into separate envelopes. Each sample is then analyzed individually to verify the melt's homogeneity. If homogeneity is confirmed and there is an agreement for an exchange of assays between the Client and Global Gold Refinery Company Limited, three identical final samples, typically 5-10 grams each, will be prepared from the drillings taken from the melt just before pouring. If homogeneity cannot be established, the lot will be re-melted.
The obtained samples are sealed by the Representative, labeled with the melt number, and distributed as follows:
a) One sealed sample is kept with Global Gold Refinery Company Limited at the Client’s disposal or delivered to their Representative, if present. Upon written instructions, Global Gold Refinery will mail this sample to the Client or the Client’s requested laboratory.
b) One sealed sample is retained at the Global Gold Refinery laboratory for analysis.
c) The final sealed sample remains with Global Gold Refinery for a potential umpire assay.
For sampling the recovery bar, the laboratory will take samples and place them into separate envelopes, labeled with the melt number and the drilling side. The samples will then be analyzed by Global Gold Refinery to verify the homogeneity of the recovery bar.
If the homogeneity of the recovery bar is confirmed, three sealed envelopes containing 5-10 grams of drilled material each will be prepared, after mixing equal parts of the drillings taken from the recovery bar. These samples will be stored with the other samples.
Assays will be performed using the fire assay method. The results will be exchanged simultaneously between the Client and Global Gold Refinery by mail on an agreed date, followed by fax or email the next day. If the difference between the exchanged results does not exceed the Splitting Limits, the arithmetic mean of the results from Global Gold Refinery and the Client will be considered final.
Splitting Limits: If an exchange of assays is contractually agreed upon, the typical splitting limits are:
- 0.05% for Au and 0.20% for Ag in gold base material
- 0.03% for Au and 0.20% for Ag in silver base material
For Pt and Pd, Global Gold Refinery's assays will be final and binding. Assay results will be expressed to four significant figures for 995.0 and higher fineness, and five significant figures for gold below 995.0 fineness.
Umpire Assay:
a) If the difference between the assays exceeds the splitting limits, both the Client and Global Gold Refinery may request a second assay or an umpire analysis.
b) The second assay or umpire analysis must be initiated within four Business Days of the request.
c) The umpire assayer will not be a Representative of the Client or Global Gold Refinery.
d) The umpire assayer will be one of the firms previously agreed upon on a rotational basis and will use the fire assay method. Any other organization may be designated as the umpire assayer by mutual agreement between the Client and Global Gold Refinery.