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Till Geochemistry and Gold Exploration in Northern New Brunswick

A.G. Pronk
AP

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A.G. Pronk

Résumé du colloque

Detailed surficial mapping and systematic till sampling (2 km grid) can effectively be used to outline target zones for further exploration in northern New Brunswick's "gold belt". After the initial gold discoveries along the Rocky Brook-Millstream fault zone, it was evident that the absence of outcrop over most of the area would obstruct basic outcrop sample prospecting as a follow-up technique. However, seven gold occurrences were discovered in 1985 and 1986 by this technique along roads and streams. Subsequently till geochemistry studies have initiated the discovery of at least one occurrence and outlined further targets for gold exploration. In this type of survey the -250 mesh fraction (clay plus silt) in the till was evaluated and found very effective. The reasons for this were: 1) the new mineralization shows the presence of fine-grained gold; 2) the reproducibility of gold analysis in this fraction is excellent; and 3) glacial dispersal trains (targets of this survey) are considered largest in this grain-size fraction. Seven gold occurrences in the area are generally registered by gold values of 10 to 20 ppb in till, whereas areas open to exploration show large anomalies (> 10 km2) with values more than 20 ppb.

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Section :
Géomorphologie
news icon Thème du colloque :
Géomorphologie
host icon Hôte : Université de Moncton

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Thème du colloque :

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Till Geochemistry and Gold Exploration in Northern New Brunswick
A.G. Pronk