The Quarterly journal of the Geological Society of London . 4i O TO eO ~ Vol. 54.] GEOLOGY OF THE WITWATERSRAND, ETC. course, namely, east, on the properties of the French Rand andChamps dOr Gold Mining Companies. On these properties theMain Eeef Series is known as the Bothas Series, while theKimberley Series is called the Battery Reef Series. Traced stillfarther, the beds swerve to the south through Randfontein andUitvaalfontein, until again cut off by an east-and-west fault, whichcarries them on to the farms Droogeheuvel, whence they may befollowed south-west through Haartebeestfontein and W
The Quarterly journal of the Geological Society of London . 4i O TO eO ~ Vol. 54.] GEOLOGY OF THE WITWATERSRAND, ETC. course, namely, east, on the properties of the French Rand andChamps dOr Gold Mining Companies. On these properties theMain Eeef Series is known as the Bothas Series, while theKimberley Series is called the Battery Reef Series. Traced stillfarther, the beds swerve to the south through Randfontein andUitvaalfontein, until again cut off by an east-and-west fault, whichcarries them on to the farms Droogeheuvel, whence they may befollowed south-west through Haartebeestfontein and Witfontein. Examined in detail in the mine-workings, the beds are found tohave suffered numerous minor dislocations by cross-courses, thefaulting being in many cases accompanied by igneous intrusion (asin fig. 2). Several instances of overthrust and reduplication by Fig. 2.— Upthrow fault in tJte Crown Reef Scale of Feet 100 200 J 300 400 Son—I 1 ! I 1 reversed faults, coursing with the strike of the beds, have also beenobserved, reference to which will be made in the sequel. Withregard to gold-contents, the best section of payable ore extends forabout 10 miles in the central part of the Rand (near Johannesburg).Outside this section occasional patches of payable or even rich oreare found, but the general average is low-grade, and there aremany places where the auriferous conteats are not sufficient torepay working. Several good sections through the Witwatersrand Beds havebeen obtained by deep borings in different parts of the have been carried down to various depths, in one caseexceeding 3000 feet, and the results obtained show a remarkable g2 84 DK. p. H. HATCH—GEOLOGY OP THE [Feb. 1898, degree of uniformity in regard to the sequence and continuity ofthe different conglomerate-beds. Thus, the Bezuidenville borehole,put down at a point 5800 feet south of the outcrop of the
Size: 1902px × 1314px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
