BILLINGS, Mont. (AP) — Exxon Mobil says it expects to incur costs of about $135 million from an oil pipeline break beneath Montana's Yellowstone River that triggered a massive effort to limit damage to the scenic waterway.The cost figure was released Friday to The Associated Press. It is more than triple an earlier estimate that did not include pipeline replacement expenses.The company's 12-inch Silvertip crude oil pipeline broke July 1 as the Yellowstone was flooding.In the 56 minutes it took Exxon Mobil to seal off the line, an estimated 42,000 gallons of oil leaked into the river near Laurel. That fouled dozens of miles of riverbank with crude.More than 1,000 workers were involved in the cleanup effort at its peak.Work to remove the damaged pipeline began Monday.

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