- Other elements, for reference purposes only:
Unless contracted at the time of negotiation, other elements above do not give Buyer right to reject and may only form the basis for further discussion in the event material assays outside of these maxes.
No other elements specified.
Lumps, in range 0-50mm, 90% min. with <10 x 10mm, 10% max.
In steel drums, uniform net weights per lot, each 50 or 100 KG, in Seller’s option.
Lot Size & Tolerance
10 MT (+/- 2%)
Standard documentation, as per MMTA Consolidated Regulations, plus original or copy Chinese assay certificate.
Weighing & Sampling
As per MMTA Consolidated Regulations.
……………………………………… (sampling and assaying guidance below is optional) ……………………………..
Open all containers, making note of any different markings, forms or indications of heterogeneity or contamination. Opening all the containers may well be impractical, alternatively open at least 100 drums (or the 10 MT drum lot number) for a 10 MT parcel, increasing by a further 20 drums (or 20% of the 10 MT drum lot number) for each subsequent sub lot of 10 MT. That is to say 120 drums for 20 MT, 140 drums for 30 MT, 160 drums for 40 MT etc. (or in accordance with the 10 MT drum lot number).
If there are not indications of material heterogeneity then sample on an incremental basis in accord with the producers cast size, generally a lot size of 2.4 I 3.8 MT (*) or as advised by the producer. If heterogeneity is suspected select the incremental groups accordingly but in sublots of (*) or less. Tip 10% of the open drums and make a quantitative size estimation of the material say in to three fractions: >50 mm, 10 mm to 50 mm, and < 10 mm. Using the appropriate ISO shovel draw take an increment from each of the tipped drums, into a sealable container to give a bulk sample. With a bulk sample for each sublot, where heterogeneity or contamination is suspected it may be considered necessary to segregate certain drums and prepare samples separately.
This bulk samples can then be crushed to nominally 2 mm size and reduced by coning and quartering to < 0.18 mm sizing, mixed and reduced by coning and quartering to give a final quality sample. Where considered desirable each sub lot can be treated to produce an individual bulk sample which can either all contribute to give a composite sample or be treated individually to give a series of quality samples.
The balance of the bulk samples being held for reference purposes.
If the material will not crush it may be necessary to employ drilling to all individual pieces to obtain a suitable sample, using tungsten carbide tipped drills at 600/700 rpm.