The FTSE small cap index is up by 0.4 percent in mid-sessiontrading, slightly outperforming a 0.3 percent rise on both the blue-chip FTSE100 and on the mid-cap FTSE 250 index.
Mining company Tertiary Minerals rises 3.6 percent to 7.28 penceafter the company announces positive results from a site in Nevada.
"With further positive news flow to come on the project next year, wereiterate our 'buy' recommendation and 16 pence target price," Cantor Fitzgeraldwrites in a research note.
Software company Quindell rises 1.5 percent after announcing newbusiness orders in a trading update.
Ferrex falls 2.5 percent after announcing a share placing to raise700,000 pounds ($1.14 million) before costs.
($1 = 0.6157 British pounds)
Reuters messaging rm://sudip.kargupta.thomsonreuters.com@reuters.net