MT Newswires -ShutterstockNon-energy mineral stocks gained the most on New Zealand's Exchange, rising past 2% at midday Wednesday. Santana Minerals (NZE:SMI, ASX:SMI) saw the sharpest increase in the sector, gaining over 7% in recent trade. On the flip side, the energy minerals sector struggled, shedding 1%. Channel Infrastructure (NZE:CHI, ASX:CHI) shares fell past 1% in recent trade.