METALS-Shanghai copper hovers near 3-mth low in holiday-thinned trade

(Adds detail, updates prices) By Melanie Burton SYDNEY, April 14 (Reuters) - Shanghai copper closed up slightly on Friday but was still mired near its weakest for the year as mounting geopolitical tensions curbed appetite for risk, while London markets were closed for the Easter holiday. FUNDAMENTALS * SHFE COPPER: Shanghai Futures Exchange copper finished up 0.2 percent at 46,110 yuan ($6,696) a tonne. On Thursday, it fell to its lowest since Jan. 4 at 45,520 yuan. Prices