Westhouse Securities has maintained its 'buy' rating and 1,000p target price for Chilean mining group Antofagasta after production guidance for 2014 came in ahead of forecasts."For 2014, guidance for copper is a fraction above our estimate (of 702,000t) and gold guidance at 270,000oz is well above our 248,000oz estimate, so in all likelihood this calls for upgrades to both 2013 and 2014 estimates, but we shall review the detail first. So, well done Antofagasta, good production results," the broker said.Canaccord Genuity has lowered its recommendation for wealth management firm Brewin Dolphin despite an in-line first quarter."Brewin Dolphin shares have performed well: since December 4th they are up 8.1% (10.4% relative to the FTSE All Share); over the past three months there are up 7.4% (8.5% relative) and over the past year up they have risen 43.9% (30.0% relative). As we anticipate only a 4.2% total shareholder return over the next 12 months, we reduce our investment recommendation from 'buy' to 'hold'."N+1 Singer has kept its 'buy' rating for floorings retailer Carpetright despite another profit warning for the firm this week, saying it still remains upbeat about its turnaround plans."The 'buy' case remains dependent upon an operationally geared recovery in the UK as a raft of positive self-help initiatives coincide with recovery in Carpetright's addressable markets."BC