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i. <br />I_ _ T-4518 64 <br />1 <br />t '- <br />•.~ . ~ •, <br />i...~: <br />• ~3 <br />:a <br />r• ;~. <br />.~ <br />-- ~..,.- <br />- . ~`•:.~ <br />.. . x .l^.,:~ 'I. <br />e . <br />Figure 39. Photomicrograph of electrum (e), chalcopyrite (c), and galena (g) replacing <br />pyrite (p) and filling open space in quartz (q); galena was also replaced by electrum as <br />evidenced by the caries texture; [he lighter ponion identified by an arrow has a Au:Ag <br />ratio of 48/52; sample CP-3-24B. Reflected light, uncrossed polars; field of viev~ is 0.2 <br />mm by 0.3 mm. <br />