Kovalevskii and Kovalevskaya [5] recommended the inner, middle and outer bark of trees as non-barriers and confirmed them as the main organs of trees which can reflect deeply buried Au deposits based on a study of 33 separate species. Kovalevskii and Kovalevskaya’s barrier concept states that every plant and plant organ offers varying degrees of resistance to metal uptake. Thus,when prospecting for an element, the focus of analysis has to be on specific plants and plant organs