• Shares of Spain-based Atalaya Mining Copper SA rise as much as 7.4% to 848p - among biggest gainers on FTSE midcaps index

• Co sees FY2026 copper production within previously guided 50,000-54,000 tonnes; silver output seen at 0.9-1.1 mln ounces

• CEO Alberto Lavandeira says firm is "increasingly confident" about both business outlook and copper market

• "In our view, the shares offer longer-term value of over 1,600p," Peel Hunt analysts say

• YTD, stock is down ~3%

(Reporting by Neeshita Beura in Bengaluru)