86 ( No. 99 ECONOMIC CONDITIONS upper Ituri district near Kilo ; near the junction of the Ubanghi river with the Congo ; between Lakes Kivu and Tanganyika ; between the rivers Lowa and Oso, south-east of Stanleyville ; and in the Mayumbe dis trict.

Diamonds . - In 1911 the Société Internationale Fores tière et Minière, a Belgian-American prospecting and trading company , discovered diamonds on a tributary of the Kasai river near the Portuguese frontier in the region of Mai Munene. The area over which they are found is wide, but their source has not yet been traced . The stones are all of small size. Fifteen American prospectors were at work here before the war. More recently the Tanganyika Concessions, Ltd., have dis covered diamond pipes on the Kundelungu plateau in Katanga.

Garnets are common in river sands . Gold .-- The Congo is rich in alluvial gold deposits, chiefly in the eastern Welle region to the west and north -west of Lake Albert, where grains of gold can be found at the first washing in practically all the streams of the district .

Rich quartz reefs have also been discovered, but none of them has as yet been worked, owing to their distance from any railway and the impossibility of obtaining machinery.

The Government alluvial gold -mines at Kilo were the first mines to be worked and have been the most successful. Receipts in 1912 were 3.5 million francs and expenditure less than 2.25 million, while in 1913 receipts were 3.75 million and expenditure less than 2 million. Other successful mines are at Moto, eighty miles or more north-west of Kilo, and at Babeyru near the Nepoko river, some eighty miles south of Poko.

Iron . — The iron ore deposits of the Congo are extremely extensive. Vast supplies are to be found