Abstract

This paper is a comparative study of certain geological features of three of the world's important pre-Cambrian gold-quartz producing districts. Special interest is given to the study because of the productivity and depth persistence of the ore deposits. Features dealt with include (a) the place relations of the deposits to granitoid batholiths, regional structure and sedimentary belts; these are shown on maps and are discussed; (b) the interrelation of intrusion, deformations and ore deposition in time and place, summarized briefly; (c) genetic classification and origin of the lodes; (d) practical considerations based on the summarized data.

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