The project would produce up to 250,000 tonnes of potash per year and have an expected life of over 100 years, according to federal government website.
Kinross, which operated in Russia for about 25 years, said the price change followed a review by a recently formed commission to control foreign investments.
According to a research group led by MIT, waste yeast discarded from a single brewery in Boston could be enough to treat the city's entire water supply.