Potaro — Kuribrong Regional Block
Introduction
The Kuribrong River properties are located in the second most important historic diamond and gold producing area in Guyana, with diamond production dating from the early 1900’s. This region is also having a present “diamond rush”, mostly by Brazilian miners, though Vannessa Ventures Ltd. Has recently reported significant resources in the region (Vannessa Ventures website, 15-June-05.)
Location and Access
Good road access is available to the region. Charter air access is also available from Georgetown to the vicinity of the Company’s properties. (See Figure 7)
Historic and Current Geological Activities
Work began in the area in and around the Kuribrong River with river traverses in 1875. Throughout the late 1920’s and 1930’s numerous investigations were made by Connolly, Bracewell, Grantham and Williams. These studies focused on surficial deposits and prospecting for alluvial deposits of gold and diamonds, but their maps also showed significant bedrock classification, and were the first to record the stratification that has remained in use today. Reports detailed a geographic relationship of bedrock lithology to topography, surficial deposits and alluvial mineralization.
Several studies in the 1960’s occurred primarily in the vicinity of old mining areas. On a more regional scale, J.H. Bateson and M.G. Allderidge (1961) reported on the geology of the area bounded by the Mazaruni, Kaburi, Waiamu, Hubana, and Kuribrong Rivers. J.W. Carter and R.H. Hewins (1963) published a preliminary report on the geology of the Eldorado Mine, which included some mapping in the southeast corner of the project area.
Regional Geology and Exploration Potential
Generally, the geology of this area is very similar to that seen in other parts of the greenstone belts of Guyana, with the oldest rocks consisting of the Lower Proterozoic Mazaruni Supergroup, intruded by Younger Granites. These rocks are uncomformably overlain by Roraima Formation sandstones and conglomerates. These units are intruded by younger basic rocks. The only unit that is not clearly discussed by previous authors includes the smaller granitic stocks. These stocks were mapped by Gibbs, et. al., (1971), but were not distinguished from the younger granites.
The Mazaruni Supergroup has many of the characteristics of an island arc succession, with marine mafic to felsic meta-volcanics, interstratified tuffaceous and exhalative sediments, overlain by tuffaceous graywackes and pelitic sediments.
Based upon historic and current production and recent success reported by Vannessa Ventures Ltd., the Company believes that its Potaro-Kuribrong regional block holdings hold reasonable potential for alluvial diamonds and/or alluvial and primary gold deposits.
Potaro — Kuribrong Regional Block
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