The estimated cost of building the massive and controversial Pebble copper and gold mine has hit $6 billion — putting it on the short list of Alaska’s most expensive projects, if the project goes forward.

Pebble’s cost is still dwarfed by a duo of the state’s biggest oil and gas projects — the $8 billion trans-Alaska oil pipeline in the mid-1970s — equivalent to about $30 billion today — and the proposed North Slope gas pipeline, estimated to cost as much as $40 billion.

But it would be far more expensive than any other Alaska mine ever built.

Pebble also would have a bigger price tag than the proposed $3.3 billion, 700-mile bullet pipeline to carry natural gas from the Brooks Range foothills to Railbelt cities.

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