* Southern Copper CEO, Grupo Mexico say Tia Maria going ahead
* Dow shares up 5 pct; Olin up 25 pct (Adds Breakingviews link, updates share prices)
ZURICH, March 27 - A leading shareholder in Swiss cement group Holcim wants to know who will lead an enlarged group to be formed in a merger with France's Lafarge before it decides whether to back the deal.
March 27 - A unit of Australia's Macquarie Group Ltd will pay $15 million to settle U.S. Securities and Exchange Commission charges that it misled investors who bought shares of China's Puda Coal Inc in an offering it underwrote.
* Chemical workers deal below pay rise for engineering workers
SAN FRANCISCO/WASHINGTON - Federal Reserve Chair Janet Yellen signalled that the U.S. central bank will likely start raising borrowing costs later this year, even before inflation and wages have returned to health, but emphasized the return to normal interest rates will be gradual.