78 (No. 96 ECONOMIC CONDITIONS ( 4) MINERALS The mineral resources of British East Africa in clude deposits of gold , iron, coal-shale, marble, graphite , manganese , opals , and alum, all of small value. There are indications of silver, copper, and tin. Salt is found in many places, and large quantities of diatomite occur in the Rift valley and near Lake Magadi . Limestone is quarried in various localities for building purposes. Ñica has been mined experi mentally . By far the most valuable mineral so far discovered is the carbonate of soda found in Lake Magadi , where the supply is fed by springs , and is apparently inexhaustible." An annual output of50,000 tons is expected when normal conditions are re-estab lished ; trial and sample exports in 1914-15 and 1915-16 were 256 and 77 tons respectively.

The Governments issue prospecting licences, and, at a later stage, mining and mineral leases, and , further, levy royalties on any gold , silver, diamonds, coal or other valuable ore or mineral that may be extracted .

(5) MANUFACTURES Pottery, iron spear -blades, hatchets , knives and hoes, barkcloth , mats and basketwork are the commonest pro ducts of native workmanship . The natives construct and thatch their own huts . “A number of Indians are employed in house- and boat-building, smithy work , furniture- and waggon -making. The cotton ginneries, dairies, flour-mills, bacon -curing establishments, sisal decorticators , and sawmills are run mainly by native labour under European supervision . Possibilities of the future are factories for matches, for jam and pre served vegetables, for paper, and for extract of tannin .

( 6) POWER The water power of East Africa has not yet been harnessed for industrial uses . Potential sources of great power exist in the Ripon Falls and Murchison Falls on the Nile .