TRANSACTIONS OF SECTION C. ALY 
that these ores in Archean rocks have their origin from the molten magma 
beneath. 
Other ores found in the Archzean rocks are galena, copper, gold and silver, tin, 
nickel, platinum, and aluminium. 
Turning to South Africa, we find a similar basal complex of granites, gneisses, 
and schists, showing some evidences of having been subjected to great dynamic 
forces, throughout British Bechuanaland, the Transvaal, Rhodesia, and Natal. 
Crystalline and metamorphic schists occurring in patches or as bands in the 
granite constitute the chief source of mineral deposits. In Rhodesia the field 
extends over about 42,000 square miles, Messrs. Chalmers and Hatch, in a paper in 
1896, dealt with this region, and came to the conclusion that the auriferous schists 
were formed from dolerite intrusions through fissures formed by the folding of the 
granitic crust. ‘I'he author’s observations lead him to the same conclusion as 
regards some of the auriferous schists in the Transvaal, and a number of slides 
cut from these schists bear.evidence to the correctness of this opinion. 
The author concludes that there exists in South Africa a far higher develop- 
ment of Archean rocks than is probably to be found elsewhere, which provide 
an immense field for most interesting research, though, unfortunately, over large 
areas the ancient series are so covered with younger formations of sandstone as to 
make a thorough investigation of them impossible, 
