During EIS meetings BLM estimated the two lane road cost to be at least double what is quoted in this article. Read the full article here: Alaska investment board approves summer work for controversial Arctic mining road
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Below are some summary quotes from the June 25th, 2020 Anchorage News article:

“Alaska’s state investment corporation has approved a $1 million survey plan for the Ambler Access Project, a controversial mining road in the Brooks Range.

In a unanimous vote, the board of the Alaska Industrial Development and Export Authority approved spending up to $500,000 this year, with that spending matched up front by Ambler Metals, a company that envisions digging mines in the area served by the 211-mile road…”

“..the agreement approved Wednesday allows the firm to credit its current spending against any eventual tolls, meaning the state would bear the full cost of the current work if the road is built…”

“Public testimony was mixed on Wednesday, with about half the speakers opposed to the summer work and half in favor.

“I totally oppose this road,” said John Horner of the Kobuk Traditional Council.
“This is really going to affect our culture and our way of life,” he said.
Other testifiers raised environmental and cost concerns.
Some testifiers said AIDEA should be spending Ambler Road money on business-relief efforts amid the coronavirus pandemic. The corporation is already operating two programs intended to assist companies suffering from the economic effects of the pandemic”.