The leader of South Africa's AMCU union said on Friday a wage deal with the top three platinum producers was imminent, signalling a possible end to a crippling five-month strike that has disrupted global output of the metal. Workers from the Association of Mineworkers and Construction Union (AMCU) begged leader Joseph Mathunjwa on Thursday to end the country's longest mining strike and sign the latest offer - an increase of about 20 percent, or 1,000 rand ($93) a month. Mathunjwa told Johannesburg radio he would take the offer to more AMCU members at mines on Friday, before meeting with management at Lonmin , Anglo American Platinum and Impala Platinum later or over the weekend to relay the response of his miners to their offer. "At least there is light at the end of the tunnel, which is not the light of a goods train," he told Talk Radio 702. The main outstanding sticking point was whether the wage deal should stretch over three or five years, he said. "W