Nigeria and its tin fieldsCalvert, Albert Frederick
History
Nigeria and its tin fields
Calvert, Albert Frederick
Tin mines and mining -- Nigeria
PRELIMINARY REPORT BY MR. ARTHUR W. HOOKE, ACCOMPANYING HIS LETTER OF
SEPTEMBER 14, 1910.
_Juga Property._—This lease stands at the highest elevation of the
three, and practically forms the divide between South Juga and Nafuta.
Its watershed is large, and the greater portion of this goes north-east
through the Nafuta gorge to the flats. The lease embraces an area of
1,440 acres and compasses the flats adjacent to two streams coming from
the South, which unite and continue north-east, passing into the Nafuta
gorge as the Juga River.
The maximum depth of the ground is only about 12 feet, and much of
it is amenable to ground sluicing, though it could be handled more
advantageously by gravel pumps. This latter scheme is eventually the
policy to adopt, as thereby most of the material can be stacked after
treatment, and any chance of silting-up be avoided.
The former (ground sluicing) will be a temporary expedient—I say
temporary advisedly, because the detritus from such operations will
eventually find its way to the area for the dam site above the Nafuta
gorge. It will be readily understood that the shape of the property is
irregular in order to most economically take in the desired area.
The rocky surroundings naturally bring down their storm waters rapidly,
and this will always act as a deterrent in ground sluicing and be a point
in favour of power plants.
The lease carries a sparse supply of timber, but will justify the
installation of a steam plant of such dimensions as that already under
construction. As time wears on, however, an alternative power must have
consideration.
The contour of the country does not lend itself to the construction of
earthwork headraces, &c., being too rocky; service water, will therefore
have to be carried in a pipe service.
I am forwarding a sketch plan showing the two streams and their
confluence under the name of the Juga. Pits as shown have been sunk and
a sampling done. The samples (Mr. Robinson informs me) were taken by a
native headman, and run very erratically from 17 lbs. to nil per cubic
yard. Robinson says that some of the holes at that time had been flooded,
and is of opinion that all the bottom wash in some instances was not
included in the samples taken.
At the present time all the pits are more or less flooded and silted, but
I will re-sample the whole of these and advise results at the earliest
possible moment.
The two dams shown in the sketch have been carried away by floods. Higher
up the river at “A,” a much better site exists, which will give more
pressure and command more ground. I propose to place one here as soon as
I can.
The tracts shown on the drawing will give some idea of the direction in
which the other leases lie.
Viewed in conjunction with the plans, the directors will have a more
concise idea of their relative positions.
Public-domain text, read in full here on John Shaqi.
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