John Drew Ridge's Annotated Bibliographies of Mineral Deposits in Africa, Asia PDF

By John Drew Ridge

ISBN-10: 0080204597

ISBN-13: 9780080204598

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Additional info for Annotated Bibliographies of Mineral Deposits in Africa, Asia (exclusive of the USSR) and Australasia

Example text

Veins in the sediments contain little gold except where they cut across the beds at low angles. Unless the wall rock is mineralized, gold is seldom found there. The indicators of the presence of gold are, there­ fore: (1) fine, light, granular pyrite, (2) fine aggregates of arsenopyrite, (3) massive or disseminated stibnite, (4) mineralized relict structures in quartz, (5) well-developed quartz veins, (6) carbon wisps in the quartz, (7) ribbon structures in the quartz, (8) carbonitization of the wall rock, and (9) serpentinization of the wall rock.

S. Afr. , v. 7 1 , Annexure, p. , 1 9 4 9 , The geology of the country around Gwelo: Geol. Surv. Bull. no. 3 9 , 145 p. Vail, J. R. and Dodson, M. , 1 9 6 9 , Geochronology of Rhodesia: S. , v. 7 2 , p. 7 9 - 1 1 0 S. Rhodesia Geol. Soc. Wagner, P. , 1 9 1 4 , The geology of a portion of the Belingwe district of Southern Rhodesia: Geol. Soc. S. , v. 1 7 , p. 3 9 - 5 4 Weiss, 0 . , 1 9 4 0 , Gravimetric and earth-magnetic measurements on the Great Dyke of Southern Rhodesia: Geol. Soc. S. , v. 4 3 , p.

In the slates, sliding is much more evident; original openings along the contacts between sediments and lavas made room for the easy entry of the older intrusions (dia­ bases), while those along the contacts between the argillaceous graywackes and the quartzites were available to the introduction of the epidolerites. The mineralized lodes (or veins) are associated with five major, northsouth fractures, and these breaks are known as (from west to east): (1) Motor Centre, (2) Footwall B, (3) Cam Spur, (4) New Cam Spur, and (5) Cam Hanging Wall.

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Annotated Bibliographies of Mineral Deposits in Africa, Asia (exclusive of the USSR) and Australasia by John Drew Ridge


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