RCW 78.04.010

The right of eminent domain is hereby extended to all corporations incorporated or that may hereafter be incorporated under the laws of this state or any state or territory of the United States, and doing business in this state, for the purpose of acquiring, owning or operating mines, mills or reduction works, or mining or milling gold and silver or other minerals, which may desire to erect and operate surface tramways or elevated cable tramways for the purpose of carrying, conveying or transporting the products of such mines, mills or reduction works.