** Shares in Mutares MUXG.DE drop 11% in early Frankfurt trade after it announced plans for a capital increase
** It will issue up to 4,269,651 new shares for gross proceeds of up to 105 million euros ($121 million), which will be used for U.S. and European expansion and to strengthen balance sheet
** The planned 20% hike to the company's market cap is a surprise, a local trader says
** New shares are priced at 24.50 euros versus Wednesday's close of 28.2 euros per share
** The stock is at the bottom of the German small-caps index .SDAXI
($1 = 0.8679 euros)
(Reporting by Anastasiia Kozlova)
((Anastasiia.Kozlova@thomsonreuters.com))