UK Stocks-Factors to watch on June 12

June 12 (Reuters) - Britain's FTSE 100 index is seen opening up 10 points at 7,747 on Tuesday, according to financial bookmakers. * BHP: Unionized workers at BHP's Spence copper mine in northern Chile agreed on Monday to a new collective labor contract, the company and the union said. * RANGER DIRECT: Two large investors in Ranger Direct Lending Fund, Oaktree Capital Management and LIM Advisors, said they would continue a push to elect their board nominees at the closed-end