Total costs have spiraled from $4.4 billion in the initial feasibility study to more than $11 billion by last year, legislators said, and that does not include the proposed power plant. "INCREASE THE BENEFITS" Rio Tinto has rejected earlier renegotiation requests but said on Friday that it was prepared to look at ways to "increase the benefits" for Mongolia. Oyu Tolgoi was launched in 2009 after an investment agreement granted Mongolia its share and the rest to Canada's Ivanhoe Mines, now the Rio Tinto-controlled Turquoise Hill Resources. Turquoise Hill's shares have plummeted 38% since the delay announcement. "I am struggling to understand why Rio's Board are not holding Jean-Sebastien Jacques accountable for this," a Rio Tinto shareholder said, referring to Rio's chief executive. "There has been zero accountability for this mess so far."