Nigeria and its tin fieldsCalvert, Albert Frederick
History
Nigeria and its tin fields
Calvert, Albert Frederick
Tin mines and mining -- Nigeria
The area is three-quarters of a mile wide by six miles long, an extent
of 4½ square miles, practically the whole of which is tin-bearing
alluvial. The alluvial is composed of a sandy material of an extremely
free nature, and the bottom is the usual coarse grey granite. The latter
outcrops in very few places, and carries from about a yard to four yards
of alluvial ground. Although the bottom could be reached in only a few
places in the stream bed, good prospects of black tin were obtained in
nearly all samples panned, and from the alluvial flats, as exposed by the
banks of the stream, the results ran from about 3 to 5 lbs. of tin per
cubic yard. The panning concentrates contained 10 to 15 per cent. of
titaniferous iron sand (which was allowed for), but this mineral presents
no difficulties, and can be easily eliminated by the ordinary dressing
operations.
The width of the property (three-quarters of a mile) does not include the
whole of the large alluvial flats that occur on either side of the river,
but having secured the river and so much of the adjacent ground, these
flats are protected, and, if necessary, may be taken up when the land for
mining purposes is selected.
Of the area staked, certainly more than two-thirds carries alluvial
ground of the thickness given above. Except in the bed of the stream,
rich patches are not expected, but a fairly uniform value throughout.
_Water._—There is a continuous flow of water for sluicing purposes all
the year round.
_Grades._—Cannot be determined without survey, but at the lower (Forum)
end of the property there is sufficient fall to allow the tailings to be
inexpensively dealt with.
_Costs._—Will compare favourably with other mines in the district, _i.e._
with ground of moderate value the costs would amount to between £10 and
£15 per ton of black tin, and present transport charges £27 10s. per ton
inclusive.
Final tests of the flats are capable of being cheaply and quickly carried
out by means of trial pits; boring is unnecessary. The probability is
that the workable ground will prove to be of too large an area to be
included in one mining lease, and that it will be necessary to split the
present area into two or more properties.
_Shen Property._—This property is situated on the left bank of the Shen
stream, on which it has been pegged out for some distance with an average
width of about two chains. The Shen property adjoins the concession
acquired by the Bisichi Tin Company (Nigeria), Ltd.
Public-domain text, read in full here on John Shaqi.
Reviews
Reviews
No reviews yet
Be the first to share your thoughts on this work.
Join the Discussion
Join the discussion
Sign in to leave a comment or review.
Sign InorCreate an account