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REPORT.
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HONG KONG.
The Tin is brought to Hong Kong partially refined
analyses some years ago gave 92/93% tin. It is then further refined
in the case of No.1
by local tin refiners by a liquation method
Chinese Tin to 99% or over. The refined tin is usually cast in
1 cwt. slabs or ingots but in recent years a considerable amount
has been cast in 28 lb. slabs.
The tin is exported by trading firms in Hong Kong who buy
from the refiners. These exporters ask the Hong Kong Government
Laboratory to sample and assay parcels of tin lying in the refiner's
warehouses. There are, however, one or two exporters who also own
refineries, e.g. Chee Hing.
The Government Laboratory sampler, whose sole duty is
sampling, proceeds to the warehouse and in the presence of a
representative of the exporter and of the refiner, samples 10%
(by number) of the parcel of slabs, irrespective of the size of
the slabs. Messrs. Daniel C. Griffith & Co. agree with me that the
method of sampling, which is by drilling, is satisfactory. Each
slab of the parcel is stamped by a stamp punch bearing the Hong Kong
Laboratory mark.
The drillings are collected, sealed and brought to the
Government Laboratory, where they are melted under tallow, dip
sampled and assayed by a method which Messrs. Daniel C. Griffith & Co.
agree will give accurate results. That the method is accurate has
been recently confirmed by duplicate analyses of a piece of tin
carried out this Spring in Hong Kong and by Messrs. Griffith.
The
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