178 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 58 



TRANSVAAL AND RHODESIA (Continued) 

 1183c. LAWN, . South African tin mines. 



South African Mg. Journ., Vol. 7, pt. 2, 1910, Johannesburg, p. 660. 

 Extracts from report of Consulting Engineer Lawn of the Doornhoek mine of South 

 African Tin Mines Company, Ltd., Transvaal. He reports very promising outlook. 



1184. MERENSKT, H. Neue Zinnerzvorkommen in Transvaal. 



Zeitschr. prakt. Geol., Vol. 12, 1904, Berlin, pp. 409-411, 1000 words. 



Digests: Neues Jahrb. Min., 1906, II (Ref.), Stuttgart, p. 228. 



Geol. Centr., Vol. 7, 1905-1906, Leipzig, pp. 328-329. 



Mg. Mag., Vol. 11, 1905, New York, p. 369. 



South African Mines, Vol. 2, 1904, Johannesburg, p. 512. 



The new occurrence is in Enkeldoorn district, 40 miles northeast of Pretoria. The 

 ore could be readily concentrated and smelted where found, water and coal being 

 close at hand. Prospecting is now under way. 



1184a. . The rocks belonging to the area of the Bushveld granite 



complex, in which tin may be expected, with descriptions of the de- 

 posits actually found. (Read March 16, 1908.) 



Trans. Geol. Soc. South Africa, Vol. 11, 1908, Johannesburg, pp. 25-42. 



Discusses the general theory of tin deposition, the rocks surrounding the South 

 African deposits, and their relative ages. He then takes up the tin deposits and 

 discusses them and their accessory minerals and also other veins which seem to have 

 close relations to the tin veins. Treats the Rooiberg, Warmbaths, Nylstroom and Pot- 

 gietersrust districts. Believes the tin ore was deposited largely from thermal solutions. 



1185. . Potgietersrust tin fields. 



South African Mines, May 23, 1908, Johannesburg. 



" Treats of output to date, geology of district, failure of government scheme and 

 success of private producer." 

 Not available to the authors. 



1185a. MILLS-DAVIES, J. E. The Transvaal tin industry. 



South African Mg. Journ., Vol. 7, pt. 1, 1909, Johannesburg, pp. 463-465, 493-494, 

 547-548, 575-576, 605-606. Illus. 

 A series of five articles. 



I. Treats of tin mining at Nylstroom. 

 II. Treats of Potgietersrust district. 



III. Treats of Warmbaths district, describing especially the Rooiberg mine, and 

 ancient Rooiberg workings. 



IV. Continues description of Rooiberg mines, extent of lodes, ore chutes and values. 

 V. Describes Rooiberg dressing plant. Yield to date. 



New discoveries in Rooiberg district are described in Vol. 7, pt. 2, 1910, p. 495. 



1186. PRAAGH, L. V. The Transvaal and its mines. 



London and Johannesburg (1907), pp. 631-633. 



States that cassiterite occurs along the Transvaal-Swaziland border on the water- 

 sheds of Steynsdorp Creek and Black Umbelosi and Little Usutu rivers in pegmatite 

 accompanying gneissoid and schistose rocks. In September, 1906, the mines of this 

 area were idle, owing to paucity of ore. Gives history of discovery of Bushveld 

 (Vlaklaagte) deposits. Tin ore on the Enkeldoorns farm in this area is in thin quartz 

 veins cutting a coarse red granite and in the rock between the veins. Describes the 

 unsuccessful working of these mines. Refers to several other prospects in the Great 

 Red Granite Laccolite. 



1186a. RECKNAGEL, R. On some mineral deposits in the Rooiberg district. 



Trans. Geol. Soc. South Africa, 1909, Johannesburg, pp. 83-106, pis. 6-16. 



Read July 20, 1908. 



Abstract: Mg. Journ. Railw. Comm. Gaz., Vol. 84, 1908, London, p. 778. 



