Contrast Study on Orebody Characteristics between Deep and Shallow Part of "Jiaojia Type" Typical Gold Deposits in Norhwestern Shandong Province

On the basis of ore exploration information in deep part of jiaojia type gold deposit with large scale,orebody characteristics in deep and shallow part are contrasted and studied from the body shape,scale,attitude change,alteration,mineralization,the main beneficial components of gold,silver content and changes and gold ore characteristics.As showed by the results,deposits scales will become large in deep part and occurrence will become slow down.The majority ore bodies do not have obvious side-volt,and ore bodies will change from simple to complex forms.Major beneficial components,such as gold and silver contents are rather high in upper and middle part of shallow ore bodies and reduced gradually;while ore bodies in deep part have low grade and changed a little.Average gold grade of ore bodies which distributed in pyrite sericitized granite belt away from the main ore bodies below the surface are higher than its in main ore bodies and changed greatly.The ratio between gold and silver grade will increase gradually from shallow to deep part.