UPDATE 2-Acacia says can't pay $300 million upfront that deal with Tanzania calls for

* Acacia targets return to profit in early 2018 * Miner burns through 88 pct of cash in Q3 vs 2016 * EBITDA down 70 pct in Q3 (Updates with detail, quotes) By Zandi Shabalala and Sanjeeban Sarkar LONDON/BENGALURU, Oct 20 (Reuters) - Acacia Mining said it could not immediately pay the $300 million that its majority shareholder agreed to hand the government of Tanzania to settle a dispute that has crippled the company’s operations in the east African country. Ac