Creidit Suisse believes that the new round of stress tests by the European Central Bank (ECB) should improve confidence in European banks as it reiterated its 'overweight' position on the sector."At this early stage we reiterate our view that if the ECB review provides transparent enough disclosures on banks' balance sheet this exercise could restore further confidence in the sector."Canaccord Genuity has maintained its 'hold' rating and 280p target price for copper miner Kazakhmys, saying that there is still come uncertainty over its near-term production forecasts.The firm said that production is on track to meet the upper end of its guidance range of 285,000-295,000 tonnes for 2013. However, the broker expects total output to fall to 265,000 tonnes in 2014 "as management's efficiency review takes effect and some higher cost, marginal mines are shut down". It said: "We are still waiting for the full outcome of the efficiency review so there is some uncertainty over our 2014 estimates."Investec has downgraded its rating for South Africa-focused miner Aquarius Platinum from 'hold' to 'sell'', saying that the company's first-quarter financials on Thursday "reflect a business which is still struggling"."The share have crept up from 42p since August. Given that the group has revealed a reduced cash position now that Mimosa is accounted for separately, and that the operating environment continues to be challenging, we see scope for the shares to retreat."BC