using multivariate methods and digital topography.

Abstract

Multi-element geochemical data can be effectively interpreted through the application of multivariate statistical techniques, imaging methods and integration with digital topographic information. These techniques have been applied to a suite of 1665 soil samples collected in a sampling program from the central Sumatra area of Indonesia. The selected samples were analyzed for Au, Cu, Pb, Zn, As, Sb, Ba, Ca, Cd, Co, Cr, Fe, Ga, K, La, Li, Mg, Mn, Nb, Ni, Sc, Sr, Ti, V, Y, Zr and Hg using aqua-regia digestion followed by ICP–IES determination.

Abstract

Mineral exploration is extending into geologically prospective areas which are overlain by surficial cover. Geochemical techniques using chemical reagents or analytical procedures that selectively dissolve certain minerals or attack specific ion-binding sites in soil have been suggested to enhance the detection of buried mineral deposits. Few of these techniques have been tested one against the other in a controlled environment, and no mechanism of transporting elements through overburden cover has been proposed that explains observed patterns. A geochemical orientation survey over two buried epithermal Au deposits at Marigold, Nevada was completed during 1994-95 in an attempt to determine the effectiveness of various analytical extractions, and develop a theory to explain observed geochemical responses.

At the Jason lead-zinc-silver-barium deposit, Yukon Territory

Abstract

The Macmillan Pass shale-hosted mineral district is located 400 km northeast of Whitehorse, Yukon Territory. On the Jason property, surface exploration based primarily on geological mapping and soil geochemistry has led to the discovery of three massive to laminated deposits rich in lead, zinc, silver, barium and iron. To date, diamond drilling has outlined geological reserves of 14.1 million tonnes grading 7.09% Pb, 6.57% Zn and 79.9 g/t Ag.

In: G.R. Parslow (Editor), Geochemical Exploration 1982.

Abstract

Ionic aureoles, overlying or contiguous to massive sulphide occurrences, are postulated to have been emplaced as a result of natural galvanic forces. The occurrences of these galvanic forces, most commonly referred to as the self-potential or spontaneous polarization phenomena, are well documented, but ionic migration in response to these electrical forces remained to be proven conclusively.

Abstract

The analysis of anion components of thirty natural water samples using an ion-chromatographic method were compared to analyses for F, Cl, NO3 and SO4 obtained by presently used techniques. Of these thirty samples, five were replicates.

Abstract

This paper deals briefly with the principles of geochemical migration in the secondary (soil, sediment) environment, a knowledge of which is essential to a correct interpretation of exploration geochemical data. Examples are given which illustrate that the principles which apply in the more easily interpreted tropical areas, also apply in the more complicated glaciated regions. Any person employing exploration geochemistry in geomorphologically complicated areas, is well advised to study data from strictly residual soil areas where the fundamentals of geochemical migration are more easily observed.