Belgium / Canada / China / France / Germany / Japan / Kazakhstan / Peru / Russia / UK / Ukraine / USA
No other elements specified
Ingots. Usually between 0.5 and 3.5 KG, though occasionally 10 KG ingots are available. “Western” producers mainly deliver in 1 KG ingots so, if a specific weight is required this should be specified at time of contract.
Original producer’s wooden cases, normally 50 KG – 100 KG each.
Lot Size & Tolerance
50 KG (+/- 2%)
Standard documentation, as per MMTA Consolidated Regulations.
Weighing & Sampling
As per MMTA Consolidated Regulations.
……………………………………….. (sampling and assaying guidance below is optional)……………………………..
Open all containers, note any different markings or form or indications of heterogeneity or contamination.
If there are no indications of material heterogeneity then sample on an incremental basis of 50 Kg sub lots, if heterogeneity is suspected select the incremental groups accordingly but in sublots of 50 Kg or less.
Select 10% of the ingots schematically, drill each ingot using a predetermined template which accounts for the whole of the ingot form. If no drilling facility is available solid pieces may be taken from different positions on the ingot form using a knife. Drilling is however the preferred method using a slow speed sharp drill at 330/350 rpm.
The drillings from each incremental sub lot should be mixed, drillings or pieces subdivided if necessary, to produce a homogeneous bulk sample in each instance.
Two options are then open:
1. Quality samples can be drawn from each homogenised sub lot bulk sample for analysis.
2. A composite can be prepared from portions of each of the sublots to give a total parcel bulk sample from which total parcel quality samples may be drawn.
The balance of the sub lots being held for reference purposes.